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3秒钟触发你的事件
<html>
<head>
<script>
var cnt = 0;
function sett()
{
if(cnt < 1) {
document.getElementById("aaa").style.display="block";
cnt = cnt + 1;
}
}
function init() {
setTimeout("sett()",3000);
}
</script>
</head>
<body onLoad="init()">
<div id="aaa" style="display:none">
fdsfdssdf
</div>
</body>
</html>
<html>
<head>
<script>
var cnt = 0;
window.onload=function(){setTimeout("sett()",3000);}
function sett()
{document.getElementById("aaa").style.display="block"; }
</script>
</head>
<body>
<div id="aaa" style="display:none">
fdsfdssdf
</div>
</body>
</html>
<html>
<head>
<style type="text/css">
.dis_none{ display:none;}
.dis{ display:block;}
</style>
<script>
window.onload=function(){
if(document.getElementById("demo_display").className=="dis_none")
{setTimeout("sett()",1000);
alert(document.getElementById("demo_display").className);}
}
function sett()
{document.getElementById("demo_display").className="dis"; }
</script>
</head>
<body>
<div id="demo_display" class="dis_none">
fdsfdssdf
</div>
</body>
</html>