js判断当前页面在移动设备还是在PC端中打开

 var browser = {
              versions: function () {
                var u = navigator.userAgent, app = navigator.appVersion;
                return {     //移动终端浏览器版本信息
                  trident: u.indexOf('Trident') > -1, //IE内核
                  presto: u.indexOf('Presto') > -1, //opera内核
                  webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核
                  gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核
                  mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
                  ios: !!u.match(/\(i[^;]+;( U;)"micromessenger") {
                    //在微信中打开
                   setInterval(WeixinJSBridge.call('closeWindow'),2000);
                }
                if (ua.match(/WeiBo/i) == "weibo") {
                    //在新浪微博客户端打开
                }
                if (ua.match(/QQ/i) == "qq") {
                    //在QQ空间打开
                }
                if (browser.versions.ios) {
                    //是否在IOS浏览器打开
                } 
                if(browser.versions.android){
                    //是否在安卓浏览器打开
                }
            } else {
                //否则就是PC浏览器打开
                window.close();
            }

<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";
      document.writeln("您的浏览设备为：");
      if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {
        document.writeln("phone");
      } else {
        document.writeln("pc");
      }
    }

    browserRedirect();
  </script>