给对像绑事件的方法

< script language = " JavaScript "  type = " text/javascript " >
    function  addListener(element,e,fn){    
         if (element.addEventListener){    
             element.addEventListener(e,fn, false );    
         }  else  {    
             element.attachEvent( " on "   +  e,fn);    
          }    
   }
    var  myinput  =  document.getElementById( " myinput " );
   addListener(myinput, " click " , function (){
    myinput.value  =   "" ;
   })
   addListener(myinput, " blur " , function (){
    myinput.value  =   " 请输入您的ID " ;
   })
< / script>