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json
//今天从数据库调取数据时，总是提示我转换为json数据格式错误，
//找了半天发现原来是特殊字符回车\n\r换行在作怪,json数据如下
{"qid":"4b01c875-edd5-442e-a8fe-eb13cfb57ea2","qtype":"选择题","qcontent":"下列数据结构中，属于非线性结构的是
A)循环队列
B)带链队列
C)二叉树
D)带链栈","answer":"A"}
1/// <summary>
2 /// 向前台输出json数据
3 /// </summary>
4 /// <param name="msg">定义好的json格式数据</param>
5 private void showJson(string msg)
6 {
7 msg = msg.Replace("\n","\\n");//避免前台json数据格式转换错误
8 msg = msg.Replace("\r", "\\r"); //避免前台json数据格式转换错误
9
10 Response.ContentType = "application/json";
11
12 Response.Write(msg);
13 Response.Flush();
14 Response.Close();
15 }
这里处理了会对前台js识别Json数组有影响的字符， 包括['|\n|\r],这三个。
处理方法是用这些字符的ASCII码来代替，
这样js不会把它当作特殊的字符处理比如回车符，
而只有在这些字符显示出来的时候才会产生作用。
'\'': 转成 "\\x27"
'\n': 转成 "\\x0A"
'\r': 转成 "\\x0D"
//增加 元素
/* var last=JSON.stringify(openmenu);
last = last.substring(0,(last.length-1))+",'td_message':'menu_message'}";
openmenu = eval('(' + last + ')'); */
<html>
<script>
//下面的操作中可能需要这三个函数我先放到这
//转换为json
function $parseJson(str){
try{
eval('var obj='+str);
return obj;
}catch(e){
return null;
}
}
//数组转换为字符串
function $ArrayToString(arr)
{
var separator = ",";//separator为分隔符
for(var i=0;i<arr.length;i++){
arr[i]=$toJsonString(arr[i]);
}
return arr.join(separator);
}
//json转换为字符串
function $toJsonString(obj){
var isArray = obj instanceof Array;
var r = [];
for(var i in obj){
var value = obj[i];
if(typeof value == 'string'){
value = '"' + value + '"';
}else if(value != null && typeof value == 'object'){
value = $toJsonString(value);
}
r.push((isArray?'':i+':')+value);
}
if(isArray){
return '['+r.join(',')+']';
}else{
return '{'+r.join(',')+'}';
}
}
////////////////////添加
////////////////////添加属性
//这是添加json元素的属性只适合这种格式的json var json={索引号:"蒋佳良",索引号:"蒋佳良"}可能会有用处因为我没看找到好得方法来添加属性，就是想了个笨方法，希望有人给予指点,其实就是把json转换为字符串来拼接。
var addjson1={"901":{}};
function addjson(jsonname,element,attribute){
var jsonString=$toJsonString(jsonname);
var jsonString = jsonString.substring(0,jsonString.length-1);
var jsonArr=","+element+":"+attribute+"}";
var jsonString=jsonString.concat(jsonArr);
alert(jsonString);
jsonname=$parseJson(jsonString);
alert(jsonname[element]);
}
//调用方法：大概有三种请注意
addjson(addjson1,902,"'蒋佳良'");//一定要注意这个单引号哟！
addjson(addjson1,903,"{name:'蒋佳良'}");//一定要注意这个单引号哟！
addjson(addjson1,904,"[{name:'蒋佳良'},{name:'蒋佳良'}]");//一定要注意这个单引号哟！
////////////////////添加属性end
////////////////////////添加节点
var addjson2=[{name:"蒋佳良"},{name:"蒋佳良"}];
///添加到指定节点
//splice(index,howmany,element1,.....,elementX)
//index 必需。规定从何处添加/删除元素。该参数是开始插入和（或）删除的数组元素的下标，必须是数字。
//howmany 必需。规定应该删除多少元素。必须是数字，但可以是 "0"。如果未规定此参数，则删除从 index 开始到原数组结尾的所有元素。
//element1 可选。规定要添加到数组的新元素。从 index 所指的下标处开始插入。
//elementX 可选。可向数组添加若干元素。
addjson2.splice(2,0,{name:"你把我推进去，并排在第3个"});//这是重点
alert(addjson2[2].name);
//添加到最后
addjson2.push({name:"你把我推进去，但是排在最后面的"});//这是重点 //好像没有这个方法
alert(addjson2[addjson2.length-1].name);
////////////////////////添加节点end
////////////////////添加end
//修改
//修改基本上我觉得没有什么特殊操作
var uptatejson=[{name:"蒋佳良"},{name:"蒋佳良"}];
uptatejson[0].name="你把我修改了";
alert(uptatejson[0].name);
////修改end
//这是json删除指定的元素
var json1={name:"蒋佳良"};
alert(json1.name);
delete json1.name;//删除指定的标识的
alert(json1.name);
//根据上面的类推的话
var json2=[{name:"蒋佳良"},{name:"蒋佳良"}];
alert(json2[1].name);
delete json2[1].name;//删除指定的标识的
alert(json2[1].name);
</script>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script>
function showJSON() {
var user =
{
"username":"andy",
"age":20,
"info": { "tel": "123456", "cellphone": "98765"},
"address":
[
{"city":"beijing","postcode":"222333"},
{"city":"newyork","postcode":"555666"}
]
} ;
alert(user.username);
alert(user.age);
alert(user.info.cellphone);
alert(user.address[0].city);
alert(user.address[0].postcode);
}
showJSON();
</script>
</head>
<body>
</body>
</html>
下面是json.js
alert('IMPORTANT: Remove this line from json.js before deployment.');
/*
json.js
2010-03-27
Public Domain
No warranty expressed or implied. Use at your own risk.
This file has been superceded by http://www.JSON.org/json2.js
See http://www.JSON.org/js.html
This code should be minified before deployment.
See http://javascript.crockford.com/jsmin.html
USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
NOT CONTROL.
This file adds these methods to JavaScript:
object.toJSONString(whitelist)
This method produce a JSON text from a JavaScript value.
It must not contain any cyclical references. Illegal values
will be excluded.
The default conversion for dates is to an ISO string. You can
add a toJSONString method to any date object to get a different
representation.
The object and array methods can take an optional whitelist
argument. A whitelist is an array of strings. If it is provided,
keys in objects not found in the whitelist are excluded.
string.parseJSON(filter)
This method parses a JSON text to produce an object or
array. It can throw a SyntaxError exception.
The optional filter parameter is a function which can filter and
transform the results. It receives each of the keys and values, and
its return value is used instead of the original value. If it
returns what it received, then structure is not modified. If it
returns undefined then the member is deleted.
Example:
// Parse the text. If a key contains the string 'date' then
// convert the value to a date.
myData = text.parseJSON(function (key, value) {
return key.indexOf('date') >= 0 ? new Date(value) : value;
});
This file will break programs with improper for..in loops. See
http://yuiblog.com/blog/2006/09/26/for-in-intrigue/
This file creates a global JSON object containing two methods: stringify
and parse.
JSON.stringify(value, replacer, space)
value any JavaScript value, usually an object or array.
replacer an optional parameter that determines how object
values are stringified for objects. It can be a
function or an array of strings.
space an optional parameter that specifies the indentation
of nested structures. If it is omitted, the text will
be packed without extra whitespace. If it is a number,
it will specify the number of spaces to indent at each
level. If it is a string (such as '\t' or ' '),
it contains the characters used to indent at each level.
This method produces a JSON text from a JavaScript value.
When an object value is found, if the object contains a toJSON
method, its toJSON method will be called and the result will be
stringified. A toJSON method does not serialize: it returns the
value represented by the name/value pair that should be serialized,
or undefined if nothing should be serialized. The toJSON method
will be passed the key associated with the value, and this will be
bound to the object holding the key.
For example, this would serialize Dates as ISO strings.
Date.prototype.toJSON = function (key) {
function f(n) {
// Format integers to have at least two digits.
return n < 10 ? '0' + n : n;
}
return this.getUTCFullYear() + '-' +
f(this.getUTCMonth() + 1) + '-' +
f(this.getUTCDate()) + 'T' +
f(this.getUTCHours()) + ':' +
f(this.getUTCMinutes()) + ':' +
f(this.getUTCSeconds()) + 'Z';
};
You can provide an optional replacer method. It will be passed the
key and value of each member, with this bound to the containing
object. The value that is returned from your method will be
serialized. If your method returns undefined, then the member will
be excluded from the serialization.
If the replacer parameter is an array of strings, then it will be
used to select the members to be serialized. It filters the results
such that only members with keys listed in the replacer array are
stringified.
Values that do not have JSON representations, such as undefined or
functions, will not be serialized. Such values in objects will be
dropped; in arrays they will be replaced with null. You can use
a replacer function to replace those with JSON values.
JSON.stringify(undefined) returns undefined.
The optional space parameter produces a stringification of the
value that is filled with line breaks and indentation to make it
easier to read.
If the space parameter is a non-empty string, then that string will
be used for indentation. If the space parameter is a number, then
the indentation will be that many spaces.
Example:
text = JSON.stringify(['e', {pluribus: 'unum'}]);
// text is '["e",{"pluribus":"unum"}]'
text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
// text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
text = JSON.stringify([new Date()], function (key, value) {
return this[key] instanceof Date ?
'Date(' + this[key] + ')' : value;
});
// text is '["Date(---current time---)"]'
JSON.parse(text, reviver)
This method parses a JSON text to produce an object or array.
It can throw a SyntaxError exception.
The optional reviver parameter is a function that can filter and
transform the results. It receives each of the keys and values,
and its return value is used instead of the original value.
If it returns what it received, then the structure is not modified.
If it returns undefined then the member is deleted.
Example:
// Parse the text. Values that look like ISO date strings will
// be converted to Date objects.
myData = JSON.parse(text, function (key, value) {
var a;
if (typeof value === 'string') {
a =
/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
if (a) {
return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
+a[5], +a[6]));
}
}
return value;
});
myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
var d;
if (typeof value === 'string' &&
value.slice(0, 5) === 'Date(' &&
value.slice(-1) === ')') {
d = new Date(value.slice(5, -1));
if (d) {
return d;
}
}
return value;
});
This is a reference implementation. You are free to copy, modify, or
redistribute.
*/
/*jslint evil: true */
/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
lastIndex, length, parse, parseJSON, prototype, push, replace, slice,
stringify, test, toJSON, toJSONString, toString, valueOf
*/
// Create a JSON object only if one does not already exist. We create the
// methods in a closure to avoid creating global variables.
JSON = JSON || {};
(function () {
function f(n) {
// Format integers to have at least two digits.
return n < 10 ? '0' + n : n;
}
if (typeof Date.prototype.toJSON !== 'function') {
Date.prototype.toJSON = function (key) {
return this.getUTCFullYear() + '-' +
f(this.getUTCMonth() + 1) + '-' +
f(this.getUTCDate()) + 'T' +
f(this.getUTCHours()) + ':' +
f(this.getUTCMinutes()) + ':' +
f(this.getUTCSeconds()) + 'Z';
};
String.prototype.toJSON =
Number.prototype.toJSON =
Boolean.prototype.toJSON = function (key) {
return this.valueOf();
};
}
var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
gap,
indent,
meta = { // table of character substitutions
'\b': '\\b',
'\t': '\\t',
'\n': '\\n',
'\f': '\\f',
'\r': '\\r',
'"' : '\\"',
'\\': '\\\\'
},
rep;
function quote(string) {
// If the string contains no control characters, no quote characters, and no
// backslash characters, then we can safely slap some quotes around it.
// Otherwise we must also replace the offending characters with safe escape
// sequences.
escapable.lastIndex = 0;
return escapable.test(string) ?
'"' + string.replace(escapable, function (a) {
var c = meta[a];
return typeof c === 'string' ? c :
'\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
}) + '"' :
'"' + string + '"';
}
function str(key, holder) {
// Produce a string from holder[key].
var i, // The loop counter.
k, // The member key.
v, // The member value.
length,
mind = gap,
partial,
value = holder[key];
// If the value has a toJSON method, call it to obtain a replacement value.
if (value && typeof value === 'object' &&
typeof value.toJSON === 'function') {
value = value.toJSON(key);
}
// If we were called with a replacer function, then call the replacer to
// obtain a replacement value.
if (typeof rep === 'function') {
value = rep.call(holder, key, value);
}
// What happens next depends on the value's type.
switch (typeof value) {
case 'string':
return quote(value);
case 'number':
// JSON numbers must be finite. Encode non-finite numbers as null.
return isFinite(value) ? String(value) : 'null';
case 'boolean':
case 'null':
// If the value is a boolean or null, convert it to a string. Note:
// typeof null does not produce 'null'. The case is included here in
// the remote chance that this gets fixed someday.
return String(value);
// If the type is 'object', we might be dealing with an object or an array or
// null.
case 'object':
// Due to a specification blunder in ECMAScript, typeof null is 'object',
// so watch out for that case.
if (!value) {
return 'null';
}
// Make an array to hold the partial results of stringifying this object value.
gap += indent;
partial = [];
// Is the value an array?
if (Object.prototype.toString.apply(value) === '[object Array]') {
// The value is an array. Stringify every element. Use null as a placeholder
// for non-JSON values.
length = value.length;
for (i = 0; i < length; i += 1) {
partial[i] = str(i, value) || 'null';
}
// Join all of the elements together, separated with commas, and wrap them in
// brackets.
v = partial.length === 0 ? '[]' :
gap ? '[\n' + gap +
partial.join(',\n' + gap) + '\n' +
mind + ']' :
'[' + partial.join(',') + ']';
gap = mind;
return v;
}
// If the replacer is an array, use it to select the members to be stringified.
if (rep && typeof rep === 'object') {
length = rep.length;
for (i = 0; i < length; i += 1) {
k = rep[i];
if (typeof k === 'string') {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
} else {
// Otherwise, iterate through all of the keys in the object.
for (k in value) {
if (Object.hasOwnProperty.call(value, k)) {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
}
// Join all of the member texts together, separated with commas,
// and wrap them in braces.
v = partial.length === 0 ? '{}' :
gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
mind + '}' : '{' + partial.join(',') + '}';
gap = mind;
return v;
}
}
// If the JSON object does not yet have a stringify method, give it one.
if (typeof JSON.stringify !== 'function') {
JSON.stringify = function (value, replacer, space) {
// The stringify method takes a value and an optional replacer, and an optional
// space parameter, and returns a JSON text. The replacer can be a function
// that can replace values, or an array of strings that will select the keys.
// A default replacer method can be provided. Use of the space parameter can
// produce text that is more easily readable.
var i;
gap = '';
indent = '';
// If the space parameter is a number, make an indent string containing that
// many spaces.
if (typeof space === 'number') {
for (i = 0; i < space; i += 1) {
indent += ' ';
}
// If the space parameter is a string, it will be used as the indent string.
} else if (typeof space === 'string') {
indent = space;
}
// If there is a replacer, it must be a function or an array.
// Otherwise, throw an error.
rep = replacer;
if (replacer && typeof replacer !== 'function' &&
(typeof replacer !== 'object' ||
typeof replacer.length !== 'number')) {
throw new Error('JSON.stringify');
}
// Make a fake root object containing our value under the key of ''.
// Return the result of stringifying the value.
return str('', {'': value});
};
}
// If the JSON object does not yet have a parse method, give it one.
if (typeof JSON.parse !== 'function') {
JSON.parse = function (text, reviver) {
// The parse method takes a text and an optional reviver function, and returns
// a JavaScript value if the text is a valid JSON text.
var j;
function walk(holder, key) {
// The walk method is used to recursively walk the resulting structure so
// that modifications can be made.
var k, v, value = holder[key];
if (value && typeof value === 'object') {
for (k in value) {
if (Object.hasOwnProperty.call(value, k)) {
v = walk(value, k);
if (v !== undefined) {
value[k] = v;
} else {
delete value[k];
}
}
}
}
return reviver.call(holder, key, value);
}
text = String(text);
// Parsing happens in four stages. In the first stage, we replace certain
// Unicode characters with escape sequences. JavaScript handles many characters
// incorrectly, either silently deleting them, or treating them as line endings.
cx.lastIndex = 0;
if (cx.test(text)) {
text = text.replace(cx, function (a) {
return '\\u' +
('0000' + a.charCodeAt(0).toString(16)).slice(-4);
});
}
// In the second stage, we run the text against regular expressions that look
// for non-JSON patterns. We are especially concerned with '()' and 'new'
// because they can cause invocation, and '=' because it can cause mutation.
// But just to be safe, we want to reject all unexpected forms.
// We split the second stage into 4 regexp operations in order to work around
// crippling inefficiencies in IE's and Safari's regexp engines. First we
// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
// replace all simple value tokens with ']' characters. Third, we delete all
// open brackets that follow a colon or comma or that begin the text. Finally,
// we look to see that the remaining characters are only whitespace or ']' or
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
if (/^[\],:{}\s]*$/.
test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
// In the third stage we use the eval function to compile the text into a
// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
// in JavaScript: it can begin a block or an object literal. We wrap the text
// in parens to eliminate the ambiguity.
j = eval('(' + text + ')');
// In the optional fourth stage, we recursively walk the new structure, passing
// each name/value pair to a reviver function for possible transformation.
return typeof reviver === 'function' ?
walk({'': j}, '') : j;
}
// If the text is not JSON parseable, then a SyntaxError is thrown.
throw new SyntaxError('JSON.parse');
};
}
}());
// Augment the basic prototypes if they have not already been augmented.
// These forms are obsolete. It is recommended that JSON.stringify and
// JSON.parse be used instead.
if (!Object.prototype.toJSONString) {
Object.prototype.toJSONString = function (filter) {
return JSON.stringify(this, filter);
};
Object.prototype.parseJSON = function (filter) {
return JSON.parse(this, filter);
};
}
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src='json.js'></script>
<title>Insert title here</title>
<script>
function myEval() {
var str = '{ "name": "Violet", "occupation": "character" }';
//可以使用eval来转换JSON字符到Object
var obj = eval('(' + str + ')');
alert(obj.name);
alert(obj.toJSONString());
}
myEval();
function myEval() {
var str = '{ "name": "Violet", "occupation": "character" }';
//可以使用eval来转换JSON字符到Object
var obj = eval('(' + str + ')');
alert(obj.name);
alert(obj.toJSONString());
}
myEval();
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script>
function jsontest()
{
var json = [{'username':'张三','userage':'20'},{'username':'李四','userage':'30'}];
alert(json[1].username);
var json2 = [['张三','20'],['李四','30']];
alert(json2[0][0]);
}
//这个函数，第一个alert(json[1].username); 会提示 “李四”。
//json 变量是一个数组对象。所以要采用 obj.username 这样的格式来调用。
//第二个 alert(json2[0][0]); 会提示 “张三”。
//json2变量是完全的一个json格式。 json和json2变量都达到了相同的效果，但json2明显要比json精简了很多。
</script>
</head>
<body>
</body>
</html>
JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式，采用完全独立于语言的文本格式，是理想的数据交换格式。同时，JSON是 JavaScript 原生格式，这意味着在 JavaScript 中处理 JSON数据不需要任何特殊的 API 或工具包。
本文主要是对JS操作JSON的方法做下总结。
在JSON中，有两种结构：对象和数组。
1. 一个对象以“{”（左括号）开始，“}”（右括号）结束。每个“名称”后跟一个“:”（冒号）；“‘名称/值’ 对”之间使用“,”（逗号）分隔。 名称用引号括起来；值如果是字符串则必须用括号，数值型则不需要。例如：
var o={"xlid":"cxh","xldigitid":123456,"topscore":2000,"topplaytime":"2009-08-20"}；
2. 数组是值（value）的有序集合。一个数组以“[”（左中括号）开始，“]”（右中括号）结束。值之间使用“,”（逗号）分隔。
例如：
var jsonranklist=[{"xlid":"cxh","xldigitid":123456,"topscore":2000,"topplaytime":"2009-08-20"},{"xlid":"zd","xldigitid":123456,"topscore":1500,"topplaytime":"2009-11-20"}];
为了方便地处理JSON数据，JSON提供了json.js包，下载地址：http://www.json.org/json.js
在数据传输过程中，json是以文本，即字符串的形式传递的，而JS操作的是JSON对象，所以，JSON对象和JSON字符串之间的相互转换是关键。例如：
JSON字符串:
var str1 = '{ "name": "cxh", "sex": "man" }';
JSON对象:
var str2 = { "name": "cxh", "sex": "man" };
一、JSON字符串转换为JSON对象
要使用上面的str1，必须使用下面的方法先转化为JSON对象：
//由JSON字符串转换为JSON对象
var obj = eval('(' + str + ')');
或者
var obj = str.parseJSON(); //由JSON字符串转换为JSON对象
或者
var obj = JSON.parse(str); //由JSON字符串转换为JSON对象
然后，就可以这样读取：
Alert(obj.name);
Alert(obj.sex);
特别注意：如果obj本来就是一个JSON对象，那么使用eval（）函数转换后（哪怕是多次转换）还是JSON对象，但是使用parseJSON（）函数处理后会有问题（抛出语法异常）。
二、可以使用toJSONString()或者全局方法JSON.stringify()将JSON对象转化为JSON字符串。
例如：
var last=obj.toJSONString(); //将JSON对象转化为JSON字符(这个不是好的 ......)
或者
var last=JSON.stringify(obj); //将JSON对象转化为JSON字符 (这个是好的 ......)
alert(last);
注意：
上面的几个方法中，除了eval()函数是js自带的之外，其他的几个方法都来自json.js包。新版本的 JSON 修改了 API，将 JSON.stringify() 和 JSON.parse() 两个方法都注入到了 Javascript 的内建对象里面，前者变成了 Object.toJSONString()，而后者变成了 String.parseJSON()。如果提示找不到toJSONString()和parseJSON()方法，则说明您的json包版本太低。
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src='json.js'></script>
<title>Insert title here</title>
<script>
function myEval() {
var str = '{ "name": "Violet", "occupation": "character" }';
//可以使用eval来转换JSON字符到Object (就是json对像)
var obj = eval('(' + str + ')');
alert(obj.name);
alert(obj.toJSONString());
}
myEval();
//另一种 eval 执行
eval('var obj='+str);
</script>
</head>
<body>
</body>
</html>
//找了半天发现原来是特殊字符回车\n\r换行在作怪,json数据如下
{"qid":"4b01c875-edd5-442e-a8fe-eb13cfb57ea2","qtype":"选择题","qcontent":"下列数据结构中，属于非线性结构的是
A)循环队列
B)带链队列
C)二叉树
D)带链栈","answer":"A"}
1/// <summary>
2 /// 向前台输出json数据
3 /// </summary>
4 /// <param name="msg">定义好的json格式数据</param>
5 private void showJson(string msg)
6 {
7 msg = msg.Replace("\n","\\n");//避免前台json数据格式转换错误
8 msg = msg.Replace("\r", "\\r"); //避免前台json数据格式转换错误
9
10 Response.ContentType = "application/json";
11
12 Response.Write(msg);
13 Response.Flush();
14 Response.Close();
15 }
这里处理了会对前台js识别Json数组有影响的字符， 包括['|\n|\r],这三个。
处理方法是用这些字符的ASCII码来代替，
这样js不会把它当作特殊的字符处理比如回车符，
而只有在这些字符显示出来的时候才会产生作用。
'\'': 转成 "\\x27"
'\n': 转成 "\\x0A"
'\r': 转成 "\\x0D"
//增加 元素
/* var last=JSON.stringify(openmenu);
last = last.substring(0,(last.length-1))+",'td_message':'menu_message'}";
openmenu = eval('(' + last + ')'); */
<html>
<script>
//下面的操作中可能需要这三个函数我先放到这
//转换为json
function $parseJson(str){
try{
eval('var obj='+str);
return obj;
}catch(e){
return null;
}
}
//数组转换为字符串
function $ArrayToString(arr)
{
var separator = ",";//separator为分隔符
for(var i=0;i<arr.length;i++){
arr[i]=$toJsonString(arr[i]);
}
return arr.join(separator);
}
//json转换为字符串
function $toJsonString(obj){
var isArray = obj instanceof Array;
var r = [];
for(var i in obj){
var value = obj[i];
if(typeof value == 'string'){
value = '"' + value + '"';
}else if(value != null && typeof value == 'object'){
value = $toJsonString(value);
}
r.push((isArray?'':i+':')+value);
}
if(isArray){
return '['+r.join(',')+']';
}else{
return '{'+r.join(',')+'}';
}
}
////////////////////添加
////////////////////添加属性
//这是添加json元素的属性只适合这种格式的json var json={索引号:"蒋佳良",索引号:"蒋佳良"}可能会有用处因为我没看找到好得方法来添加属性，就是想了个笨方法，希望有人给予指点,其实就是把json转换为字符串来拼接。
var addjson1={"901":{}};
function addjson(jsonname,element,attribute){
var jsonString=$toJsonString(jsonname);
var jsonString = jsonString.substring(0,jsonString.length-1);
var jsonArr=","+element+":"+attribute+"}";
var jsonString=jsonString.concat(jsonArr);
alert(jsonString);
jsonname=$parseJson(jsonString);
alert(jsonname[element]);
}
//调用方法：大概有三种请注意
addjson(addjson1,902,"'蒋佳良'");//一定要注意这个单引号哟！
addjson(addjson1,903,"{name:'蒋佳良'}");//一定要注意这个单引号哟！
addjson(addjson1,904,"[{name:'蒋佳良'},{name:'蒋佳良'}]");//一定要注意这个单引号哟！
////////////////////添加属性end
////////////////////////添加节点
var addjson2=[{name:"蒋佳良"},{name:"蒋佳良"}];
///添加到指定节点
//splice(index,howmany,element1,.....,elementX)
//index 必需。规定从何处添加/删除元素。该参数是开始插入和（或）删除的数组元素的下标，必须是数字。
//howmany 必需。规定应该删除多少元素。必须是数字，但可以是 "0"。如果未规定此参数，则删除从 index 开始到原数组结尾的所有元素。
//element1 可选。规定要添加到数组的新元素。从 index 所指的下标处开始插入。
//elementX 可选。可向数组添加若干元素。
addjson2.splice(2,0,{name:"你把我推进去，并排在第3个"});//这是重点
alert(addjson2[2].name);
//添加到最后
addjson2.push({name:"你把我推进去，但是排在最后面的"});//这是重点 //好像没有这个方法
alert(addjson2[addjson2.length-1].name);
////////////////////////添加节点end
////////////////////添加end
//修改
//修改基本上我觉得没有什么特殊操作
var uptatejson=[{name:"蒋佳良"},{name:"蒋佳良"}];
uptatejson[0].name="你把我修改了";
alert(uptatejson[0].name);
////修改end
//这是json删除指定的元素
var json1={name:"蒋佳良"};
alert(json1.name);
delete json1.name;//删除指定的标识的
alert(json1.name);
//根据上面的类推的话
var json2=[{name:"蒋佳良"},{name:"蒋佳良"}];
alert(json2[1].name);
delete json2[1].name;//删除指定的标识的
alert(json2[1].name);
</script>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script>
function showJSON() {
var user =
{
"username":"andy",
"age":20,
"info": { "tel": "123456", "cellphone": "98765"},
"address":
[
{"city":"beijing","postcode":"222333"},
{"city":"newyork","postcode":"555666"}
]
} ;
alert(user.username);
alert(user.age);
alert(user.info.cellphone);
alert(user.address[0].city);
alert(user.address[0].postcode);
}
showJSON();
</script>
</head>
<body>
</body>
</html>
下面是json.js
alert('IMPORTANT: Remove this line from json.js before deployment.');
/*
json.js
2010-03-27
Public Domain
No warranty expressed or implied. Use at your own risk.
This file has been superceded by http://www.JSON.org/json2.js
See http://www.JSON.org/js.html
This code should be minified before deployment.
See http://javascript.crockford.com/jsmin.html
USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
NOT CONTROL.
This file adds these methods to JavaScript:
object.toJSONString(whitelist)
This method produce a JSON text from a JavaScript value.
It must not contain any cyclical references. Illegal values
will be excluded.
The default conversion for dates is to an ISO string. You can
add a toJSONString method to any date object to get a different
representation.
The object and array methods can take an optional whitelist
argument. A whitelist is an array of strings. If it is provided,
keys in objects not found in the whitelist are excluded.
string.parseJSON(filter)
This method parses a JSON text to produce an object or
array. It can throw a SyntaxError exception.
The optional filter parameter is a function which can filter and
transform the results. It receives each of the keys and values, and
its return value is used instead of the original value. If it
returns what it received, then structure is not modified. If it
returns undefined then the member is deleted.
Example:
// Parse the text. If a key contains the string 'date' then
// convert the value to a date.
myData = text.parseJSON(function (key, value) {
return key.indexOf('date') >= 0 ? new Date(value) : value;
});
This file will break programs with improper for..in loops. See
http://yuiblog.com/blog/2006/09/26/for-in-intrigue/
This file creates a global JSON object containing two methods: stringify
and parse.
JSON.stringify(value, replacer, space)
value any JavaScript value, usually an object or array.
replacer an optional parameter that determines how object
values are stringified for objects. It can be a
function or an array of strings.
space an optional parameter that specifies the indentation
of nested structures. If it is omitted, the text will
be packed without extra whitespace. If it is a number,
it will specify the number of spaces to indent at each
level. If it is a string (such as '\t' or ' '),
it contains the characters used to indent at each level.
This method produces a JSON text from a JavaScript value.
When an object value is found, if the object contains a toJSON
method, its toJSON method will be called and the result will be
stringified. A toJSON method does not serialize: it returns the
value represented by the name/value pair that should be serialized,
or undefined if nothing should be serialized. The toJSON method
will be passed the key associated with the value, and this will be
bound to the object holding the key.
For example, this would serialize Dates as ISO strings.
Date.prototype.toJSON = function (key) {
function f(n) {
// Format integers to have at least two digits.
return n < 10 ? '0' + n : n;
}
return this.getUTCFullYear() + '-' +
f(this.getUTCMonth() + 1) + '-' +
f(this.getUTCDate()) + 'T' +
f(this.getUTCHours()) + ':' +
f(this.getUTCMinutes()) + ':' +
f(this.getUTCSeconds()) + 'Z';
};
You can provide an optional replacer method. It will be passed the
key and value of each member, with this bound to the containing
object. The value that is returned from your method will be
serialized. If your method returns undefined, then the member will
be excluded from the serialization.
If the replacer parameter is an array of strings, then it will be
used to select the members to be serialized. It filters the results
such that only members with keys listed in the replacer array are
stringified.
Values that do not have JSON representations, such as undefined or
functions, will not be serialized. Such values in objects will be
dropped; in arrays they will be replaced with null. You can use
a replacer function to replace those with JSON values.
JSON.stringify(undefined) returns undefined.
The optional space parameter produces a stringification of the
value that is filled with line breaks and indentation to make it
easier to read.
If the space parameter is a non-empty string, then that string will
be used for indentation. If the space parameter is a number, then
the indentation will be that many spaces.
Example:
text = JSON.stringify(['e', {pluribus: 'unum'}]);
// text is '["e",{"pluribus":"unum"}]'
text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
// text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
text = JSON.stringify([new Date()], function (key, value) {
return this[key] instanceof Date ?
'Date(' + this[key] + ')' : value;
});
// text is '["Date(---current time---)"]'
JSON.parse(text, reviver)
This method parses a JSON text to produce an object or array.
It can throw a SyntaxError exception.
The optional reviver parameter is a function that can filter and
transform the results. It receives each of the keys and values,
and its return value is used instead of the original value.
If it returns what it received, then the structure is not modified.
If it returns undefined then the member is deleted.
Example:
// Parse the text. Values that look like ISO date strings will
// be converted to Date objects.
myData = JSON.parse(text, function (key, value) {
var a;
if (typeof value === 'string') {
a =
/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
if (a) {
return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
+a[5], +a[6]));
}
}
return value;
});
myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
var d;
if (typeof value === 'string' &&
value.slice(0, 5) === 'Date(' &&
value.slice(-1) === ')') {
d = new Date(value.slice(5, -1));
if (d) {
return d;
}
}
return value;
});
This is a reference implementation. You are free to copy, modify, or
redistribute.
*/
/*jslint evil: true */
/*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
lastIndex, length, parse, parseJSON, prototype, push, replace, slice,
stringify, test, toJSON, toJSONString, toString, valueOf
*/
// Create a JSON object only if one does not already exist. We create the
// methods in a closure to avoid creating global variables.
JSON = JSON || {};
(function () {
function f(n) {
// Format integers to have at least two digits.
return n < 10 ? '0' + n : n;
}
if (typeof Date.prototype.toJSON !== 'function') {
Date.prototype.toJSON = function (key) {
return this.getUTCFullYear() + '-' +
f(this.getUTCMonth() + 1) + '-' +
f(this.getUTCDate()) + 'T' +
f(this.getUTCHours()) + ':' +
f(this.getUTCMinutes()) + ':' +
f(this.getUTCSeconds()) + 'Z';
};
String.prototype.toJSON =
Number.prototype.toJSON =
Boolean.prototype.toJSON = function (key) {
return this.valueOf();
};
}
var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
gap,
indent,
meta = { // table of character substitutions
'\b': '\\b',
'\t': '\\t',
'\n': '\\n',
'\f': '\\f',
'\r': '\\r',
'"' : '\\"',
'\\': '\\\\'
},
rep;
function quote(string) {
// If the string contains no control characters, no quote characters, and no
// backslash characters, then we can safely slap some quotes around it.
// Otherwise we must also replace the offending characters with safe escape
// sequences.
escapable.lastIndex = 0;
return escapable.test(string) ?
'"' + string.replace(escapable, function (a) {
var c = meta[a];
return typeof c === 'string' ? c :
'\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
}) + '"' :
'"' + string + '"';
}
function str(key, holder) {
// Produce a string from holder[key].
var i, // The loop counter.
k, // The member key.
v, // The member value.
length,
mind = gap,
partial,
value = holder[key];
// If the value has a toJSON method, call it to obtain a replacement value.
if (value && typeof value === 'object' &&
typeof value.toJSON === 'function') {
value = value.toJSON(key);
}
// If we were called with a replacer function, then call the replacer to
// obtain a replacement value.
if (typeof rep === 'function') {
value = rep.call(holder, key, value);
}
// What happens next depends on the value's type.
switch (typeof value) {
case 'string':
return quote(value);
case 'number':
// JSON numbers must be finite. Encode non-finite numbers as null.
return isFinite(value) ? String(value) : 'null';
case 'boolean':
case 'null':
// If the value is a boolean or null, convert it to a string. Note:
// typeof null does not produce 'null'. The case is included here in
// the remote chance that this gets fixed someday.
return String(value);
// If the type is 'object', we might be dealing with an object or an array or
// null.
case 'object':
// Due to a specification blunder in ECMAScript, typeof null is 'object',
// so watch out for that case.
if (!value) {
return 'null';
}
// Make an array to hold the partial results of stringifying this object value.
gap += indent;
partial = [];
// Is the value an array?
if (Object.prototype.toString.apply(value) === '[object Array]') {
// The value is an array. Stringify every element. Use null as a placeholder
// for non-JSON values.
length = value.length;
for (i = 0; i < length; i += 1) {
partial[i] = str(i, value) || 'null';
}
// Join all of the elements together, separated with commas, and wrap them in
// brackets.
v = partial.length === 0 ? '[]' :
gap ? '[\n' + gap +
partial.join(',\n' + gap) + '\n' +
mind + ']' :
'[' + partial.join(',') + ']';
gap = mind;
return v;
}
// If the replacer is an array, use it to select the members to be stringified.
if (rep && typeof rep === 'object') {
length = rep.length;
for (i = 0; i < length; i += 1) {
k = rep[i];
if (typeof k === 'string') {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
} else {
// Otherwise, iterate through all of the keys in the object.
for (k in value) {
if (Object.hasOwnProperty.call(value, k)) {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
}
// Join all of the member texts together, separated with commas,
// and wrap them in braces.
v = partial.length === 0 ? '{}' :
gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
mind + '}' : '{' + partial.join(',') + '}';
gap = mind;
return v;
}
}
// If the JSON object does not yet have a stringify method, give it one.
if (typeof JSON.stringify !== 'function') {
JSON.stringify = function (value, replacer, space) {
// The stringify method takes a value and an optional replacer, and an optional
// space parameter, and returns a JSON text. The replacer can be a function
// that can replace values, or an array of strings that will select the keys.
// A default replacer method can be provided. Use of the space parameter can
// produce text that is more easily readable.
var i;
gap = '';
indent = '';
// If the space parameter is a number, make an indent string containing that
// many spaces.
if (typeof space === 'number') {
for (i = 0; i < space; i += 1) {
indent += ' ';
}
// If the space parameter is a string, it will be used as the indent string.
} else if (typeof space === 'string') {
indent = space;
}
// If there is a replacer, it must be a function or an array.
// Otherwise, throw an error.
rep = replacer;
if (replacer && typeof replacer !== 'function' &&
(typeof replacer !== 'object' ||
typeof replacer.length !== 'number')) {
throw new Error('JSON.stringify');
}
// Make a fake root object containing our value under the key of ''.
// Return the result of stringifying the value.
return str('', {'': value});
};
}
// If the JSON object does not yet have a parse method, give it one.
if (typeof JSON.parse !== 'function') {
JSON.parse = function (text, reviver) {
// The parse method takes a text and an optional reviver function, and returns
// a JavaScript value if the text is a valid JSON text.
var j;
function walk(holder, key) {
// The walk method is used to recursively walk the resulting structure so
// that modifications can be made.
var k, v, value = holder[key];
if (value && typeof value === 'object') {
for (k in value) {
if (Object.hasOwnProperty.call(value, k)) {
v = walk(value, k);
if (v !== undefined) {
value[k] = v;
} else {
delete value[k];
}
}
}
}
return reviver.call(holder, key, value);
}
text = String(text);
// Parsing happens in four stages. In the first stage, we replace certain
// Unicode characters with escape sequences. JavaScript handles many characters
// incorrectly, either silently deleting them, or treating them as line endings.
cx.lastIndex = 0;
if (cx.test(text)) {
text = text.replace(cx, function (a) {
return '\\u' +
('0000' + a.charCodeAt(0).toString(16)).slice(-4);
});
}
// In the second stage, we run the text against regular expressions that look
// for non-JSON patterns. We are especially concerned with '()' and 'new'
// because they can cause invocation, and '=' because it can cause mutation.
// But just to be safe, we want to reject all unexpected forms.
// We split the second stage into 4 regexp operations in order to work around
// crippling inefficiencies in IE's and Safari's regexp engines. First we
// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
// replace all simple value tokens with ']' characters. Third, we delete all
// open brackets that follow a colon or comma or that begin the text. Finally,
// we look to see that the remaining characters are only whitespace or ']' or
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
if (/^[\],:{}\s]*$/.
test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
// In the third stage we use the eval function to compile the text into a
// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
// in JavaScript: it can begin a block or an object literal. We wrap the text
// in parens to eliminate the ambiguity.
j = eval('(' + text + ')');
// In the optional fourth stage, we recursively walk the new structure, passing
// each name/value pair to a reviver function for possible transformation.
return typeof reviver === 'function' ?
walk({'': j}, '') : j;
}
// If the text is not JSON parseable, then a SyntaxError is thrown.
throw new SyntaxError('JSON.parse');
};
}
}());
// Augment the basic prototypes if they have not already been augmented.
// These forms are obsolete. It is recommended that JSON.stringify and
// JSON.parse be used instead.
if (!Object.prototype.toJSONString) {
Object.prototype.toJSONString = function (filter) {
return JSON.stringify(this, filter);
};
Object.prototype.parseJSON = function (filter) {
return JSON.parse(this, filter);
};
}
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src='json.js'></script>
<title>Insert title here</title>
<script>
function myEval() {
var str = '{ "name": "Violet", "occupation": "character" }';
//可以使用eval来转换JSON字符到Object
var obj = eval('(' + str + ')');
alert(obj.name);
alert(obj.toJSONString());
}
myEval();
function myEval() {
var str = '{ "name": "Violet", "occupation": "character" }';
//可以使用eval来转换JSON字符到Object
var obj = eval('(' + str + ')');
alert(obj.name);
alert(obj.toJSONString());
}
myEval();
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script>
function jsontest()
{
var json = [{'username':'张三','userage':'20'},{'username':'李四','userage':'30'}];
alert(json[1].username);
var json2 = [['张三','20'],['李四','30']];
alert(json2[0][0]);
}
//这个函数，第一个alert(json[1].username); 会提示 “李四”。
//json 变量是一个数组对象。所以要采用 obj.username 这样的格式来调用。
//第二个 alert(json2[0][0]); 会提示 “张三”。
//json2变量是完全的一个json格式。 json和json2变量都达到了相同的效果，但json2明显要比json精简了很多。
</script>
</head>
<body>
</body>
</html>
JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式，采用完全独立于语言的文本格式，是理想的数据交换格式。同时，JSON是 JavaScript 原生格式，这意味着在 JavaScript 中处理 JSON数据不需要任何特殊的 API 或工具包。
本文主要是对JS操作JSON的方法做下总结。
在JSON中，有两种结构：对象和数组。
1. 一个对象以“{”（左括号）开始，“}”（右括号）结束。每个“名称”后跟一个“:”（冒号）；“‘名称/值’ 对”之间使用“,”（逗号）分隔。 名称用引号括起来；值如果是字符串则必须用括号，数值型则不需要。例如：
var o={"xlid":"cxh","xldigitid":123456,"topscore":2000,"topplaytime":"2009-08-20"}；
2. 数组是值（value）的有序集合。一个数组以“[”（左中括号）开始，“]”（右中括号）结束。值之间使用“,”（逗号）分隔。
例如：
var jsonranklist=[{"xlid":"cxh","xldigitid":123456,"topscore":2000,"topplaytime":"2009-08-20"},{"xlid":"zd","xldigitid":123456,"topscore":1500,"topplaytime":"2009-11-20"}];
为了方便地处理JSON数据，JSON提供了json.js包，下载地址：http://www.json.org/json.js
在数据传输过程中，json是以文本，即字符串的形式传递的，而JS操作的是JSON对象，所以，JSON对象和JSON字符串之间的相互转换是关键。例如：
JSON字符串:
var str1 = '{ "name": "cxh", "sex": "man" }';
JSON对象:
var str2 = { "name": "cxh", "sex": "man" };
一、JSON字符串转换为JSON对象
要使用上面的str1，必须使用下面的方法先转化为JSON对象：
//由JSON字符串转换为JSON对象
var obj = eval('(' + str + ')');
或者
var obj = str.parseJSON(); //由JSON字符串转换为JSON对象
或者
var obj = JSON.parse(str); //由JSON字符串转换为JSON对象
然后，就可以这样读取：
Alert(obj.name);
Alert(obj.sex);
特别注意：如果obj本来就是一个JSON对象，那么使用eval（）函数转换后（哪怕是多次转换）还是JSON对象，但是使用parseJSON（）函数处理后会有问题（抛出语法异常）。
二、可以使用toJSONString()或者全局方法JSON.stringify()将JSON对象转化为JSON字符串。
例如：
var last=obj.toJSONString(); //将JSON对象转化为JSON字符(这个不是好的 ......)
或者
var last=JSON.stringify(obj); //将JSON对象转化为JSON字符 (这个是好的 ......)
alert(last);
注意：
上面的几个方法中，除了eval()函数是js自带的之外，其他的几个方法都来自json.js包。新版本的 JSON 修改了 API，将 JSON.stringify() 和 JSON.parse() 两个方法都注入到了 Javascript 的内建对象里面，前者变成了 Object.toJSONString()，而后者变成了 String.parseJSON()。如果提示找不到toJSONString()和parseJSON()方法，则说明您的json包版本太低。
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src='json.js'></script>
<title>Insert title here</title>
<script>
function myEval() {
var str = '{ "name": "Violet", "occupation": "character" }';
//可以使用eval来转换JSON字符到Object (就是json对像)
var obj = eval('(' + str + ')');
alert(obj.name);
alert(obj.toJSONString());
}
myEval();
//另一种 eval 执行
eval('var obj='+str);
</script>
</head>
<body>
</body>
</html>
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