<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>div块布局</title>
<style>
</style>
<script>
window.onload=function(){
var ok=document.getElementById("box");
ok.onclick=function(){
alert("加载完了！")
};
};
</script>
</head>
<body>
<div id="box">ok</div>
</body>
</html>