javascript 兼容所有浏览器的DOM扩展功能(4)


<!DOCTYPE html>
<html lang="zh">
 <head>
  <title>DOM功能扩展</title>
 </head>
 <body>
    <a href="javascript:void(0)">你好</a>
    <script type="text/javascript">
        function DOMExtend(name, fn){
            if(typeof(HTMLElement)!="undefined"){
                eval("HTMLElement.prototype."+name+"="+fn);
            }
            else{
                var _getElementById=document.getElementById;
                document.getElementById=function(id){
                    var _elem=_getElementById(id);
                    eval("_elem."+name+"="+fn);
                    return _elem;
                }
                var _getElementByTagName=document.getElementsByTagName;
                document.getElementsByTagName=function(tag){
                    var _elem=_getElementByTagName(tag);
                    var len=_elem.length;
                    for(var i=0;i<len;i++){
                        eval("_elem["+i+"]."+name+"="+fn);
                    }
                    return _elem;
                }
                var _createElement=document.createElement;
                document.createElement=function(tag){
                    var _elem=_createElement(tag);
                    eval("_elem."+name+"="+fn);
                    return _elem;
                }
                var _documentElement=document.documentElement;
                eval("_documentElement."+name+"="+fn);
                var _documentBody=document.body;
                eval("_documentBody."+name+"="+fn);
            }
        }
        function BindEvent(event,fun){
            if(this.addEventListener){
                this.addEventListener(event,fun,false);
            }
            else{
                var tag=this;
                tag.attachEvent("on"+event,function(){
                    fun.apply(tag,arguments);//这里是关键
                });
            }
        }
        DOMExtend("bind",BindEvent);var wrap=document.getElementById("tagA");
        wrap.bind("click",function(){
            alert(this.innerHTML);
        })
    </script>
 </body>
</html>

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