判断是否为PC

function IsPC() {
   var userAgentInfo = navigator.userAgent;
   var Agents = ["Android", "iPhone",
      "SymbianOS", "Windows Phone",
      "iPad", "iPod"];
   var flag = true;
   for (var v = 0; v < Agents.length; v++) {
      if (userAgentInfo.indexOf(Agents[v]) > 0) {
         flag = false;
         break;
      }
   }
   return flag;
}

或者

if (/(iPhone|iPad|iPod|iOS|Android)/i.test(navigator.userAgent)) { //移动端
    //TODO
}