这是我的页面控制CSS作业
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>这是我的页面控制CSS作业</title>
<style>
#box{width:300px;height:200px;background:green;padding-left:15px;padding-top:15px;}
</style>
</head>
<body>
<div id="box"></div>
<input type="button" value="变圆" onclick="byuan()">
<input type="button" value="变宽" onclick="bk()">
<input type="button" value="变色" onclick="bs()">
<input type="button" value="重置" onclick="czhi()">
<input type="button" value="隐藏" onclick="yc()">
<input type="button" value="显示" onclick="xs()">
<script type="text/javascript">
var box
window.onload=function(){
box=document.getElementById('box')
}
function byuan(){
box.style.borderRadius="50px"
}
function bk(){
box.style.width="500px"
}
function bs(){
box.style.background="red"
}
function czhi(){
box.style.height="300px"
box.style.width="300px"
box.style.background="green"
}
function yc(){
box.style.display="none"
}
function xs(){
box.style.display="block"
}
</script>
</body>
</html>