能判断是电脑端还是手机端的javascript

<script language="javascript">

//平台、设备和操作系统

var system ={

win : false,

mac : false,

xll : false

};

//检测平台

var p = navigator.platform;

system.win = p.indexOf("Win") == 0;

system.mac = p.indexOf("Mac") == 0;

system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);

//跳转语句，如果是手机访问就自动跳转到m.yijile.com页面

if(system.win||system.mac||system.xll){

}else{

window.location.href="http://m.yijile.com";

}

</script>

<script language="javascript">

function is_mobile() {

    var regex_match = /(nokia|iphone|android|motorola|^mot-|softbank|foma|docomo|kddi|up.browser|up.link|htc|dopod|blazer|netfront|helio|hosin|huawei|novarra|CoolPad|webos|techfaith|palmsource|blackberry|alcatel|amoi|ktouch|nexian|samsung|^sam-|s[cg]h|^lge|ericsson|philips|sagem|wellcom|bunjalloo|maui|symbian|smartphone|midp|wap|phone|windows ce|iemobile|^spice|^bird|^zte-|longcos|pantech|gionee|^sie-|portalmmm|jigs browser|hiptop|^benq|haier|^lct|operas*mobi|opera*mini|320x320|240x320|176x220)/i;

  var u = navigator.userAgent;

  if (null == u) {

   return true;

  }

  var result = regex_match.exec(u);

  if (null == result) {

   return false

  } else {

   return true

  }

 }

 if (is_mobile()) {

  document.location.href= 'http://m.yijile.com';  //修改http://m.yijile.com为你所需跳转目标页地址

 }

</script>

<!--识别手机或电脑的js开始-->

<script language="javascript">

(function(){

    var res = GetRequest();

    var par = res['index'];

    if(par!='gfan'){

        var ua=navigator.userAgent.toLowerCase();

        var contains=function (a, b){

            if(a.indexOf(b)!=-1){return true;}

        };

//将下面的http://m.yijile.com改成你的wap手机版页面地址 如我的 http://m.yijile.com

        var toMobileVertion = function(){

            window.location.href = 'http://m.yijile.com/'

        }

        if(contains(ua,"ipad")||(contains(ua,"rv:1.2.3.4"))||(contains(ua,"0.0.0.0"))||(contains(ua,"8.0.552.237"))){return false}

        if((contains(ua,"android") && contains(ua,"mobile"))||(contains(ua,"android") && contains(ua,"mozilla")) ||(contains(ua,"android") && contains(ua,"opera"))

    ||contains(ua,"ucweb7")||contains(ua,"iphone")){toMobileVertion();}

    }

})();

function GetRequest() {

   var url = location.search; //获取url中"?"符后的字串

   var theRequest = new Object();

   if (url.indexOf("?") != -1) {

      var str = url.substr(1);

      strs = str.split("&");

      for(var i = 0; i < strs.length; i ++) {

         theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);

      }

   }

   return theRequest;

}

</script>

<!--识别手机或电脑的js结束-->