我写了个script，if(window.localStorage){alert("localStorage")}为什么ie下弹不出来？

我写了个script，if(window.localStorage){alert("localStorage")}为什么ie下弹不出来？

ie的话用userdata模拟吧
if(!window.localStorage && /MSIE/.test(navigator.userAgent)){
if(!window.UserData) {
window.UserData = function(file_name) {
if(!file_name) file_name="user_data_default";
var dom = document.createElement('input');
dom.type = "hidden";
dom.addBehavior ("#default#userData");
document.body.appendChild(dom);
dom.save(file_name);
this.file_name = file_name;
this.dom = dom;
return this;
};

window.UserData.prototype = {
setItem:function(k, v)
{
this.dom.setAttribute(k,v);
this.dom.save(this.file_name);
},
getItem:function(k){
this.dom.load(this.file_name);
return this.dom.getAttribute(k);
},
removeItem:function(k){
this.dom.removeAttribute(k);
this.dom.save(this.file_name);
}，

clear:function() {
this.dom.load(this.file_name);
var now = new Date();
now = new Date(now.getTime()-1);
this.dom.expires = now.toUTCString();
this.dom.save(this->file_name);
｝
};
}
window.localStorage= new window.UserData("local_storage");
}追问试了
木行哈！

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