如何用JS判断手机端还是PC端访问？

<script type="text/javascript">

function browserRedirect() { 

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:1.2.3.4/i) == "rv: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"; 



if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {

    alert("this is phone"); 

  } else {

    alert("this is computer"); 

  } 

} 



window.onload=function(){browserRedirect();

    

} 

    

</script>