下拉刷新单webview模式自动触发无效？

//官方demo

(function($) {  
                //阻尼系数  
                var deceleration = mui.os.ios ? 0.003 : 0.0009;  
                $('.mui-scroll-wrapper').scroll({  
                    bounce: false,  
                    indicators: true, //是否显示滚动条  
                    deceleration: deceleration  
                });  
                $.ready(function() {  
                    //循环初始化所有下拉刷新，上拉加载。  
                    $.each(document.querySelectorAll('.mui-slider-group .mui-scroll'), function(index, pullRefreshEl) {  
                        console.log(index);//这里会执行  

                        $(pullRefreshEl).pullToRefresh({  
                            down: {  
                                style: 'circle',  
                                color: '#2BD009',  
                                auto: true,  
                                callback: function() {  
                                    //不会执行  
                                    console.log("222")  
                                    var self = this;  
                                    setTimeout(function() {  
                                        var ul = self.element.querySelector('.mui-table-view');  
                                        ul.insertBefore(createFragment(ul, index, 10, true), ul.firstChild);  
                                        self.endPullDownToRefresh();  
                                    }, 1000);  
                                }  
                            },  
                            up: {  
                                callback: function() {  
                                    var self = this;  
                                    setTimeout(function() {  
                                        var ul = self.element.querySelector('.mui-table-view');  
                                        ul.appendChild(createFragment(ul, index, 5));  
                                        self.endPullUpToRefresh();  
                                    }, 1000);  
                                }  
                            }  
                        });  
                    });  
                    var createFragment = function(ul, index, count, reverse) {  
                        var length = ul.querySelectorAll('li').length;  
                        var fragment = document.createDocumentFragment();  
                        var li;  
                        for(var i = 0; i < count; i++) {  
                            li = document.createElement('li');  
                            li.className = 'mui-table-view-cell';  
                            li.innerHTML = '第' + (index + 1) + '个选项卡子项-' + (length + (reverse ? (count - i) : (i + 1)));  
                            fragment.appendChild(li);  
                        }  
                        return fragment;  
                    };  
                });  
            })(mui);