mui页面下拉刷新的问题，列表在底部时下拉的话会直接刷新（不会返回顶部）？

1，列表向上滑到底部时，再下拉想返回顶部时就执行下拉（感觉无法滑动到顶部了，一下拉就就触发刷新事件）。
2，这句mui('#refreshContainer').pullRefresh().endPullupToRefresh((++count > 2));是什么意思呢？

<!--内容列表-->  
        <div id="refreshContainer" class="mui-content mui-scroll-wrapper">  
            <div class="mui-scroll">  
                <!--数据列表-->  
                <ul class="mui-table-view mui-table-view-chevron mian-list" id="search_list">  

                </ul>  
            </div>  
        </div>  

mui.init({  
                pullRefresh: {  
                    container: "#refreshContainer",   
                    down: {  
//                      contentdown: "下拉可以刷新",   
//                      contentover: "释放立即刷新",   
//                      contentrefresh: "正在刷新...",   
                        callback: handleFresh   
                    },  
                    up: {  
                        contentrefresh: "正在加载...",   
//                      contentnomore: '没有更多数据了',   
                        callback: handleLoad   
                    }  
                }  
            });  

            window.onload = function() {  
                var data = {  
                    "dbteacher": "1"  
                };  
                handleData("search_list", "http://192.168.1.11/", data);  

                mui.plusReady(function() {  

                    //关闭等待框  
                    plus.nativeUI.closeWaiting();  
                    //显示当前页面  
                    mui.currentWebview.show();  
                });  
            }  

            var count = 0;  

            function handleFresh() {  
                setTimeout(function() {  
                    var table = document.body.querySelector('.mui-table-view');  
                    var cells = document.body.querySelectorAll('.mui-table-view-cell');  
                    for (var i = cells.length, len = i + 3; i < len; i++) {  
                        var li = document.createElement('li');  
                        li.className = 'mui-table-view-cell';  
                        li.innerHTML = '<a class="mui-navigate-right">Item ' + (i + 1) + '</a>';  
                        //下拉刷新，新纪录插到最前面；  
                        table.insertBefore(li, table.firstChild);  
                    }  
                    mui('#refreshContainer').pullRefresh().endPulldownToRefresh(); //refresh completed  
                }, 1500);  
            }  

            function handleLoad() {  
                setTimeout(function() {  
                    mui('#refreshContainer').pullRefresh().endPullupToRefresh((++count > 2));   
                    var table = document.body.querySelector('.mui-table-view');  
                    var cells = document.body.querySelectorAll('.mui-table-view-cell');  
                    for (var i = cells.length, len = i + 20; i < len; i++) {  
                        var li = document.createElement('li');  
                        li.className = 'mui-table-view-cell';  
                        li.innerHTML = '<a class="mui-navigate-right">Item ' + (i + 1) + '</a>';  
                        table.appendChild(li);  
                    }  
                }, 1500);  
            }