判断是ios终端还是android终端

   

 var u = navigator.userAgent,
        app = navigator.appVersion,
        isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或者uc浏览器
        isiOS = !!u.match(/(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端