window.navigator.userAgent=='micromessenger'

navigator.userAgent.match(/Android/i)

navigator.userAgent.indexOf('iPhone')!=-1

navigator.userAgent.indexOf('iPad') != -1

navigator.userAgent.indexOf('iPod') != -1

function isWeiXin() {
    var ua = window.navigator.userAgent.toLowerCase();
    if (ua.match(/MicroMessenger/i) == 'micromessenger') {
      return true;
    } else {
      return false;
    }
 }

 if(!isWeiXin()&&!(navigator.userAgent.match(/Android/i) || (navigator.userAgent.indexOf('iPhone') != -1) || (navigator.userAgent.indexOf('iPod') != -1) || (navigator.userAgent.indexOf('iPad') != -1))) {
     var sogou_ad_id=4767753;  //联盟广告计费id
 }
<script src="http://images.sohu.com/cs/jsfile/js/c.js" charset="utf-8"></script> //广告内容加载