JQuery1.4+ Ajax IE8 内存泄漏问题_jquery
并且JQuery1.3.2版本不存在，JQuery1.4+版本存在
通过对比，最终找到这两个版本的其中一个差别
JQuery1.4+在ajax方法增加了一段代码，用于在abort时调用onreadystatechange方法
try {
var oldAbort = xhr.abort;
xhr.abort = function() {
if ( xhr ) {
oldAbort.call( xhr );
}
onreadystatechange();
};
} catch(e) { }
经查，正是此段赋值产生了错误
onreadystatechange的readyState为4，即成功时，将xhr.abort销毁
内存泄漏解决
另：如果直接xhr.abort=null，不知道为什么在IE6下会报错
只好try…catch一下，反正IE6不修正错误与不会有问题
此项问题在IE8中有问题的原因不明
可能是xhr.abort与oldAbort产生了一个闭包？
但为什么IE6不泄漏？
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