function getTerminalType() {

     //获取navigator对象

     var o = navigator.userAgent,

         t = "";

     if (/\biPhone\b|\biPad\b/.test(o) && !/android/i.test(o)) {

         t = "ios";

     } else if (/android/i.test(o)) {

         t = "android";

     } else if (/windows/i.test(o)) {

         t = "windows";

     }

     console.log(t);

     return t;

 }