个回答

• kelly329

  2015-12-17 19:48:07

  <script type="text/javascript">
         var btn3=document.getElementById("btn3");
        function showMes(){
          
         alert("hello world!");
        }
        var eventUtil={
              // 添加句柄
              addHandler:function(element,type,handler){
                 if(element.addEventListener){
                   element.addEventListener(type,handler,false);
                 }else if(element.attachEvent){
                   element.attachEvent('on'+type,handler);
                 }else{
                   element['on'+type]=handler;
                 }
              },
              // 删除句柄
              removeHandler:function(element,type,handler){
                 if(element.removeEventListener){
                   element.removeEventListener(type,handler,false);
                 }else if(element.detachEvent){
                   element.detachEvent('on'+type,handler);
                 }else{
                   element['on'+type]=null;
                 }
              },
             
              }
               eventUtil.addHandler(btn3,'click',showMes);
        </script>

  
  

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