html form

<input id="chkXY" type="checkbox" checked="checked" />
<input id="chkFCM" type="checkbox"  checked="checked" />
<input id="chkXY" type="radio" checked="checked" />
<input id="chkFCM" type="radio"  checked="checked" />
<input type="radio" name="fruit" value = "Orange" checked>桔子<br>

以上关于选中状态肯定是正确的



 <form action="" method="post" enctype="multipart/form-data" name="form1"
    id="form1">
            aa
            <input type="text" name="textfield" />
            bb
            <input type="hidden" name="hiddenField" />
            cc
            <textarea name="textarea"></textarea>
            <br />
            dd
            <input type="checkbox" name="checkbox" value="checkbox" />
            ff aaa
            <input type="radio" name="RadioGroup1" value="单选" />
            <br />
            bbb
            <input type="radio" name="RadioGroup1" value="单选" />
             hh
            <select name="menu1" onchange="MM_jumpMenu('parent',this,0)">
                <option value="#">aa</option>
                <option value="#">bb</option>
                <option value="#">cc</option>
            </select>
            ii
            <input type="file" name="file" />
    </form>





     <input  class="input1" id="username" name="username"  size="25" autocomplete="off"
     disableautocomplete=""  maxlength="50" type="text">                    //行
      <input  class="input1" id="username" name="username"  size="25" autocomplete="off"
     disableautocomplete=""  maxlength="50" type="text">                  //也行
      autocomplete="off" //for ie
     disableautocomplete //for firefox
     
     
     
     
     
     
     autocomplete 禁用自动补全firefox
     disableautocomplete history.go(-); 文本框也显示为空firefox