jquery判断iPhone、Android设备类型

function downloadApp(){ var u = navigator.userAgent;  var ua = navigator.userAgent.toLowerCase();  var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端   var isiOS = !!u.match(//(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端  if(ua.match(/MicroMessenger/i)=="micromessenger") { //微信内置浏览器  $(".download a").click(function(){   window.location.href='http://a.app.qq.com/o/simple.jsp?pkgname=应用名 '  }); }else{  if(isiOS){      $(".download a").click(function(){    window.location.href='https://itunes.apple.com/cn/app/应用名'   });  }else if(isAndroid){   $(".download a").click(function(){    window.location.href='http://a.app.qq.com/o/simple.jsp?pkgname=应用名'   });  }else{   $(".download a").click(function(){    window.location.href='应用链接'   });  } }   }