<html>
<head>
<meta charset="utf-8">
<meta name="generator"
content="HTML Tidy for HTML5 (experimental) for Windows https://github.com/w3c/tidy-html5/tree/c63cc39" />
<title></title>
<style>
#div1{
width:100px;
height:100px;
background:red;
}
</style>
<script>
function toYellow(){
var oDiv=document.getElementById('div1');
oDiv.style.background='yellow';
}
function toGreen(){
var oDiv=document.getElementById('div1');
oDiv.style.background='green';
}
function toBlue(){
var oDiv=document.getElementById('div1');
oDiv.style.background='blue';
}
</script>
</head>
<body>
<input type="button" value="变黄" onclick="toYellow()"/>
<input type="button" value="变绿" onclick="toGreen()"/>
<input type="button" value="变蓝" onclick="toBlue()"/>
<div id="div1"></div>
</body>
</html>
