日期:2014-05-16  浏览次数:20461 次

option标签值获取在ie和firefox标准浏览器之间的差别???
JScript code
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
function check(form){
    alert("[" + form.age.value + "]");// [ ]
    alert(typeof(form.age.value));//string
    alert(form.age.value==" ");//IE ture, firefox/chrome> false
    return false;
}
</script>
</head>

<body>
<form onsubmit="check(this);" method="post" action="#">
    <select name="age">
        <option>&nbsp;</option>
        <option value="18">18</option>
    </select>
    <input type="submit" value="submit" />
</form>
</body>
</html>

用firebug看到此时option的值是" ",为何firefox和chrome alert(form.age.value==" ");等于false
,而IE为true。在firefox中怎么写才能变成true,也即此时value究竟是什么?

------解决方案--------------------

我在ie9下测得也是false,而且值为""
火狐就不知道为什么了
这样改下吧 
function check(form){
alert("[" + form.age.value + "]");// [ ]
alert(typeof(form.age.value));//string
alert(form.age.value.replace(/^\s+/,"")=="");//IE ture, firefox/chrome> false
return false;
}
------解决方案--------------------
<form onsubmit="check(this);" method="post" action="#">

表单 没有name 


<form onsubmit="check(this);" method="post" action="#" name='myForm'>

alert("[" + document.myForm.age.value + "]")