<html> <body> <div id="div1">点我绑定事件</div> <script> var addEvent = function( elem, type, handler ){
//重写addEvent的好处是下一次调用时不会再走if判断，提高了一部分性能
if ( window.addEventListener ){
addEvent = function( elem, type, handler ){ elem.addEventListener( type, handler, false ); } }else if ( window.attachEvent ){ addEvent = function( elem, type, handler ){ elem.attachEvent( 'on' + type, handler ); } } addEvent( elem, type, handler ); }; var div = document.getElementById( 'div1' ); addEvent( div, 'click', function(){ alert (1); }); addEvent( div, 'click', function(){ alert (2); }); </script> </body> </html>