判断是否是pc或移动端

<script type="text/javascript">


 var sUserAgent = navigator.userAgent.toLowerCase();    
var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";    
var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";    
var bIsMidp = sUserAgent.match(/midp/i) == "midp";    
var bIsUc7 = sUserAgent.match(/rv:[图片]1.2.3.4/i) == "rv:[图片]1.2.3.4";    
var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";    
var bIsAndroid = sUserAgent.match(/android/i) == "android";    
var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";    

var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile"; 

//添加两个不同的css   

if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM ){    
var linkNode = document.createElement("link");
   linkNode.setAttribute("rel","stylesheet");
   linkNode.setAttribute("type","text/css");
  linkNode.setAttribute("href","mobile.css");
  document.head.appendChild(linkNode);


}else{
var linkPc = document.createElement("link");
   linkPc.setAttribute("rel","stylesheet");
   linkPc.setAttribute("type","text/css");
  linkPc.setAttribute("href","pc.css");
  document.head.appendChild(linkPc);
}
//需要添加两个css文件


</script>