<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body style="height:4000px">
<style>
-
{
margin: 0;
padding: 0;
}#btn {
text-align: center;
margin-top: 10px;
}#main {
background-color: #008800;
width: 100px;
height: 100px;
margin: 30px auto;
}
</style><div id="btn">
<button id="wider">变宽</button> <button id="higher">变高</button> <button id="change-color">变色</button> <button id="hide">隐藏</button> <button id="reset">重置</button>
</div>
<div id="wrap">
<div id="main"></div>
</div>
<script>
i=0;
oDiv = document.getElementById('main');
-
oBtn = document.getElementsByTagName('button');
for(i,len=oBtn.length;i<len;i++){oBtn[i].onclick=function(){ switch(this.id){ case "wider" : oDiv.style.width = "200px"; break; case "higher" : oDiv.style.height = "200px"; break; case "change-color" : oDiv.style.background = "red"; break; case "hide" : oDiv.style.display = "none"; break; case "reset" : oDiv.style.background = "#008800"; oDiv.style.width = "100px"; oDiv.style.height = "100px"; oDiv.style.display = "block"; }
}
}
</script></body>
</html>