<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
window.onload = open;
function open() {
var menu = document.getElementById("menu");
menu.onchange=function(){
var bgcolor = this.value;
if(bacolr=="")return;
document.body.style.background=bgcolor
}
}
</script>
</head>
<body>
<div class="box">
请选择背景颜色:
<select name="" id="=menu">
<option value="">请选择</option>
<option value="#foo">红色</option>
<option value="#ofo">绿色</option>
<option value="#oof">蓝色</option>
<option value="#ff0">黄色</option>
<option value="#ccc">灰色</option>
</select>
</div>
</body>
</html>
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