div.addEventListener('click',fn);

div.addEventListener('click',fn2);
function fn(){ console.log("春雨绵绵"); }

function fn2(){
        console.log("到处潮湿");
      }

div.attachEvent('onclick',fn);
div.attachEvent('onclick',fn2);
function fn(){ console.log("春雨绵绵"); }
function fn2(){
        console.log("到处潮湿");
      }

var div=document.getElementsByTagName("div")[0];
      addEvent('click',div,fn)
      function addEvent(str,ele,fn){
        ele.attachEvent?ele.attachEvent('on'+str,fn):ele.addEventListener(str,fn);
      }
      function fn(){
        console.log("春雨绵绵");
      }

function remove(str,ele,fn){
        ele.detachEvent?ele.detachEvent("on"+str,fn):ele.removeEventListener(str,fn);
      }