mui下拉刷新的li标签内加入按钮 点第一次弹一下 再点一次弹两下 以此类推

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-'+ '<button onclick="dianji()">111</button>'+ (length + (reverse ? (count - i) : (i + 1)));  
                            fragment.appendChild(li);  

                        }  

                        return fragment;  
                    };

有大神可以说下哪里出了问题吗