再安卓上这个代码可以使用，但是苹果的话就不行了，是不是支付宝的内置浏览器在这两个版本不一样，求解决

 window.onload = function(){ 
                    if(isWeiXin()){ 
                    alert("微信"); 
                    }else if(isZFB()){
                    alert("支付宝");
                    }else{
                    alert("其他");
                    }
                    
                } 
                function isWeiXin(){ 
                    var ua = window.navigator.userAgent.toLowerCase(); 
                        if(ua.match(/MicroMessenger/i) == 'micromessenger'){ 
                            return true; 
                        }else{ 
                            return false; 
                           } 
                } 
                function isZFB(){
                
                    var ua = window.navigator.userAgent.toLowerCase(); 
                        if(ua.match(/AlipayClient/i) =='alipayclient'){ 
                            return true; 
                        }else{ 
                            return false; 
                        } 
                }