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<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
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<body>
<div id="box"></div>
</body>
<script>
document.write('屏幕的宽度:'+window.screen.width+'<br/>');
document.write('屏幕的高度:'+window.screen.height+'<br/>');
//获取屏幕的宽度
w=window.screen.width;
var link = document.getElementById('link');
switch(w){
case 1280:
link.href="a.css";
break;
case 1024:
link.href="b.css";
break;
}
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document.write('文档可用宽度:'+window.innerWidth+'<br/>');
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