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<html>
<head>
<script language="javascript">
var ttt=document.getElementById("ttt");
if(ttt.addEventListener){ //Firefox
ttt.addEventListener("click",a,false);
ttt.addEventListener("click",b,false);
ttt.addEventListener("click",c,false);
}
else{ //可恶的IE
ttt.attachEvent("onclick",a);
ttt.attachEvent("onclick",b);
ttt.attachEvent("onclick",c);
}
function a(){
alert("a");
}
function b(){
alert("b");
}
function c(){
alert("c");
}
</script>
</head>
<body>
<div id="ttt">你好,世界!</div>
</body>
</html>
<html>
<head>
<title> </title>
<script language="javascript">
function test(){
var div=document.getElementById("aaa");
if(!div.onclick){
alert("div.onclick")
}
if(!div.onmousedown){
alert("div.onmousedown")
}
if(!div.onmouseover){
alert("div.onmouseover")
}
}
window.onload=function(){
test();
}
</script>
</head>
<body>
<div id="aaa" onclick="a()" onmousedown="b()"></div>
</body>
</html>