防覆盖

var isFromTuia = (function () {    var tuiaDomains = ['tuisnake', 'localhost']    function GetUrlDomain(url) {      var arrUrl = url.split("//");      var start = arrUrl[1].indexOf("/");      var relUrl = arrUrl[1].substring(0, start); //stop省略，截取从start开始到结尾的所有字符      return relUrl;    }    var es = document.getElementsByTagName('script');    var iScript = es[es.length - 1]    if (iScript && iScript.src) {      var iDomain = GetUrlDomain(iScript.src);      for (var i = 0; i < tuiaDomains.length; i++) {        if (iDomain.indexOf(tuiaDomains[i]) != -1) {          return true;        }       }    }    return false;  })();  function defineTaWin(key, value, isFreeze) {    if (Object.defineProperty && isFreeze) {      Object.defineProperty(window, key, {        writable: false,        value: value      });    } else {      window[key] = value;    }  }  defineTaWin('countLog', countLog, isFromTuia);