如何判断客户端是Android还是Ios

    var u = navigator.userAgent;
    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 (isAndroid) {
      console.log('Android');
    }else{
      console.log('isiOS');
    }