<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>Examples</title><meta name="description" content=""><meta name="keywords" content=""><link href="" rel="stylesheet"></head><body> <input type="button" id="but1" value="按钮"> <script type="text/JavaScript"> function showtt(){ alert("你应该知道些知识"); } var event={ add:function(a,b,c){ if(a.addEventListener) {a.addEventListener(b, c, false);} else if(a.attachEvent) {a.attachEvent('on'+b,c);} else {a['on'+b]=c;} } }rem:function(a,b,c){ if(a.removeEventListener) {a.removeEventListener(b, c, false);} else if(a.detachEvent) {a.detachEvent('on'+b,c);} else {a['on'+b]=null;} } }event.add(btn1,'click',showtt); </script></body></html>
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