被禁用的 input 元素既不可用，也不可点击。可以设置 disabled 属性，直到满足某些其他的条件为止(比如选择了一个复选框等等)。然后，就需要通过 JavaScript 来删除 disabled 值，将 input 元素的值切换为可用。
以下三种写法都可以禁用 input
被禁用的 input 默认显示灰色，可以通过CSS修改样式。bjdkfp.codeplex.com;
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ntfpt.codeplex.com;注：IE9及以下无法改变字体颜色。
1. 利用CSS3 :disabled 伪元素定义
//Chrome Firefox Opera Safari
input:disabled{undefined
border: 1px solid #DDD;
background-color: #F5F5F5;
color:#ACA899;
}
2. 利用属性选择符定义
//IE6 failed
input[disabled]{undefined
border: 1px solid #DDD;
background-color: #F5F5F5;
color:#ACA899;
}
3. 利用类来定义
input.disabled{undefined
border: 1px solid #DDD;
background-color: #F5F5F5;
color:#ACA899;
}
最终结果：
//Chrome Firefox Opera Safari IE9+
input:disabled{undefined
border: 1px solid #DDD;
background-color: #F5F5F5;
color:#ACA899;
}
//IE8-
input[disabled]{undefined
border: 1px solid #DDD;
background-color: #F5F5F5;
color:#ACA899;
}
//IE6 Using Javascript to add CSS class "disabled"
* html input.disabled{undefined
border: 1px solid #DDD;
background-color: #F5F5F5;
color:#ACA899;
}
注意：IE8 bug 由于IE8 不识别 :disabled 导致input[disabled],input:disabled样式失效，可以考虑单独来写，或者直接使用input[disabled]。;IE9及以下无法改变字体颜色。
来自 https://blog.csdn.net/cy12272961151353/article/details/26491593?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link
