通过原生JS实现为元素添加事件

    var bindEvent = {

        ‘add‘:function(id,type,fn,isBubble){

            var dom = document.getElementById(id);
            if(!isBubble) isBubble=false;
            if(dom.addEventListenner){
                dom.addEventListenner(type,fn,isBubble);
            }else if(dom.attachEvent){
                Transit = function(){
                    fn.call(dom);
                }
                dom.attachEvent(‘on‘+type,Transit);
            }else{
                dom[‘on‘+type] = fn;
            }
        },
        ‘remove‘:function(id,type,fn,isBubble){
            var dom = document.getElementById(id);
            if(!isBubble) isBubble=false;
            if(dom.removeEventListenner){
                dom.removeEventListenner(type,fn,isBubble)
            }else if(dom.detachEvent){
                dom.detachEvent(‘on‘+type,Transit)
            }else{
                dom[‘on‘+type]=null;
            }

        }

    }

  //定义事件处理程序
 function msg(){
    alert(this.tagName)
 }

  //为目标元素绑定事件
  bindEvent.add(‘link‘,‘click‘,msg,false);

  //解除目标元素绑定的事件
  bindEvent.remove(‘link‘,‘click‘,msg,false);