jquery to Judge iphone, Android device type _jquery

Recently made a version of micro-letter publicity page, through the JQ to judge the device, and to download

Micro-letter built-in browser to download the link to the screen, so first to judge, if the micro-letter built-in browser, then jump to apply the treasure link, if not, the judge is iphone/adroid/pc and to jump

The code is as follows:

function Downloadapp () {
 var u = navigator.useragent; 
 var ua = Navigator.userAgent.toLowerCase (); 
 var isandroid = u.indexof (' Android ') >-1 | | U.indexof (' Adr ') >-1; Android Terminal 
  var Isios =!! U.match (/\ (i[^;] +;( U;)? Cpu.+mac OS x/); iOS terminal 
 if (ua.match (/micromessenger/i) = = "Micromessenger") {//micro-letter built-in browser
  $ (". Download a"). Click (function () {
   window.location.href= ' http://a.app.qq.com/o/simple.jsp?pkgname= application name '
  });

 else{
  if (isios) {

   

   $ (". Download a"). Click (function () {
    window.location.href= ' https:// itunes.apple.com/cn/app/application name '
   } ';
  } else if (isandroid) {
   $ (". Download a"). Click (function () {
    window.location.href= ' http://a.app.qq.com/o/ Simple.jsp?pkgname= application name '
   } ';
  } else{

   $ (". Download a"). Click (function () {
    window.location.href= ' Apply link '

   });

  }

 }

  

  

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