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document.getElementById('aaa').click();
document.getElementById('aaa').onclick();
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="yixianggao@126.com" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head>
<body>
<input id="aaa" type="button" value="123" onclick="alert" />
<script type="text/javascript">
<!--
var btn = document.getElementById('aaa');
btn.onclick = function() {
alert(this.value);
};
btn.click();
//-->
</script>
</body>
</html>
if(document.all) //兼容ie
{
document.getElementById('aaa').click();
}
else //兼容ff
{
var evt = document.createEvent("MouseEvents");
evt.initEvent("click", true, true);
document.getElementById('aaa').dispatchEvent(evt);
}