用JS改变DVI的宽高，颜色，显示和隐藏
<!DOCTYPE html>
<html>
<head>
<title>改变div</title>
<style type="text/css">
#box{width:100px; height: 100px; background:red; margin:20px 80px;}
</style>
</head>
<body>
<div id="box">
</div>
<input type="button" value="变高" onclick="changeHeight()">
<input type="button" value="变宽" onclick="changeK()">
<input type="button" value="变色" onclick="changeColor()">
<input type="button" value="重置" onclick="reset()">
<input type="button" value="隐藏" onclick="hide()">
<input type="button" value="显示" onclick="show()">
<script type="text/javascript">
var box = document.getElementById('box');
window.onload= function(){
}
function changeHeight(){
box.style.height="400px"
}
function changeK(){
box.style.width="400px"
}
function changeColor(){
box.style.background="pink";
}
function reset(){
box.style.width="100px";
box.style.height="100px;"
box.style.background="red"
}
function hide(){
box.style.display="none"
}
function show(){
box.style.display="block"
}
</script>
</body>
</html>