改变css样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>控制div样式</title>
<style>
#yangshi{width: 100px;height: 100px;background: #0a6aa1;margin: 10px 30px;}
</style>
</head>
<body>
<script type="text/javascript">
var my;
window.onload=function (){
my=document.getElementById(yangshi);
};
function wid(){
yangshi.style.width="300px"
}
function hei(){
yangshi.style.height="300px"
}
function color(){
yangshi.style.background="green"
}
function reset(){
yangshi.style.width="100px";
yangshi.style.height="100px";
yangshi.style.background="#0a6aa1";
}
function hide(){
yangshi.style.display="none"
}
function show(){
yangshi.style.display="block"
}
</script>
<div id="yangshi" ></div>
<input type="button" value="变宽" onclick="wid()">
<input type="button" value="变高" onclick="hei()">
<input type="button" value="改变颜色" onclick="color()">
<input type="button" value="重置" onclick="reset()">
<input type="button" value="隐藏" onclick="hide()">
<input type="button" value="显示" onclick="show()">
</body>
</html>