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- Title: js中的object detection
- 0/38
- stauren
IP hidden - 2008-03-03 10:35
71 days ago
看了这篇文章
才发现，原来IE有这个问题
上面这段代码，在IE中同样会alert。因为IE自动把每个ID的 元素的DOM映射成为window的一个property！
其实检查多级的object链一直是一个问题，比较费代码，所以我曾经写过这样一个函数来检查：
其实各个流行的库里面都有类似的方法，YUI的namespace，google的如下这段（google不开源，这是本人从压缩后的代码好不容易才复原出来的）
才发现，原来IE有这个问题
<html>
<head>
<script>
window.onload = function(){
if ( window.opera ) {
alert("You're using Opera, pick me!");
}
};
</script>
</head>
<body>
<h1>Which browser?</h1>
<a href="http://mozilla.com/" id="firefox"> Firefox</a><br/>
<a href="http://apple.com/" id="safari"> Safari</a><br/>
<a href="http://opera.com/" id="opera"> Opera</a><br/>
<a href="http://microsoft.com/" id="ie"> Internet Explorer</a>
</body>
</html>上面这段代码，在IE中同样会alert。因为IE自动把每个ID的 元素的DOM映射成为window的一个property！
其实检查多级的object链一直是一个问题，比较费代码，所以我曾经写过这样一个函数来检查：
function isSet (varName){ //check if the the object link exist
var bAry=varName.split(/\./),
d=window;
for(var i=0,j=bAry.length;i<j;i++){
if (d[bAry[i]] == undefined) {
return false;
}
d = d[bAry[i]];
}
return true;
}其实各个流行的库里面都有类似的方法，YUI的namespace，google的如下这段（google不开源，这是本人从压缩后的代码好不容易才复原出来的）
function setNewvalue(varName,newValue){ //set value to a member, and create the object link
var bAry=varName.split(/\./);
var d=window;
for(var i=0,j=bAry.length-1;i<j;i++){
d[bAry[i]] = d[bAry[i]] || {};
d=d[bAry[i]]
}
d[bAry[bAry.length-1]]=newValue
}
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李旭
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肖琦
1984-06-29:(46 days away)
周旭
1983-07-07:(54 days away)
于洋
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stauren@西湖湖畔
JavaScript is the world's most misunderstood programming language. The language has so much expressive power that it is possible to be somewhat productive with it without knowing what you're doing. But that is not an effective way to work. Programming is serious business that should never be undertaken in ignorance.
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Belle
JavaScript is the world's most misunderstood programming language. The language has so much expressive power that it is possible to be somewhat productive with it without knowing what you're doing. But that is not an effective way to work. Programming is serious business that should never be undertaken in ignorance.
Listen Yahoo!
Let's start from here!
一般的SB都是酷酷的
Belle
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All we got here, are memories. With heart & soul. 2006-2008 STauren! © Ver 0.7.1