检测屏幕宽度，并设置为id为frame的div宽度，根据自己网页的最大宽度来调节，小demo最大宽度为1440
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<head>
<metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/>
<title>无标题文档</title>
<scriptsrc="js/jquery.min.js"type="text/javascript"></script>
<script>
functiononWidthChange(){
varw=$(window).width();
x=(w-1440)/2;
$("#frame").css("width",w);
if(w<1024){
$("#frame").css("overflow","visible");
$("#webContent").css("margin-left",x);
}elseif(1024<w<1440){
$("#frame").css("overflow","hidden");
$("#webContent").css("margin-left",x);
}
setTimeout(onWidthChange,0);
};
</script>
</head>
<body>
<divid="frame"style="overflow:hidden;">
<divid="webContent">
//内容
</div>
</div>
</body>
</html>
