<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>
</title>
<style type="text/css">
#div1{
width: 200px;
height: 200px;
background: red;
display: none;
}
</style>
<script type="text/javascript">
window.onload=function(){
var obtn1=document.getElementById("btn");
obtn1.onclick=function(){
var oDiv=document.getElementById("div1");
if(oDiv.style.display=="none"){
oDiv.style.display="block";
}
else{
oDiv.style.display="none";
}
}
}
</script>
</head>
<body>
<input type="button" name="" id="btn" value="显示隐藏" />
<div id="div1">
</div>
</body>
</html>
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