<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>

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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



}

}

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</head>



<body>

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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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