JS判断android/IOS,并执行回调函数

    var u = navigator.userAgent;
    var isAndroid = u.indexOf(‘Android‘) > -1 || u.indexOf(‘Adr‘) > -1; //android
    var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios

                if (isAndroid) {
                    blin.CallAndroid(xxxx, yyyyy);
                }
                if (isiOS) {
                     var jsonString ="{\"XXXXXXXXXX\":"+xxxxxxxx+",\"YYYYYYYYY\":\""+yyyyyyyy+"\"}";
                     window.webkit.messageHandlers.AppModel.postMessage({body:jsonString});
                }