How to achieve infinite page loading using js and jquery

Example:
Jingdong mobile version page product list

First define the page scroll event scroll binding function

$(window).on("scroll", function() {
    scrollFunction();
})

Then define the function scrollFunction()

function scrollFunction() {
    var e = $("#page-num");
    e.scrollTop  = $(window).scrollTop();
    e.scrollStar = e.scrollEnd;
    e.scrollEnd  = $(window).scrollTop();    // 分页显示
    if (e.scrollStar != e.scrollEnd) {        // 当滚动的时候 显示分页信息 显示1秒
        setTimeout(function() {
            e.hide();
        }, 1000);        
        var j = null;        
        var l = $(window).height();        
        var d = $(window).scrollTop();        // 新页的产品列表 页数写在 li 标签里 然后循环所有的这个标签 
        p_lis = $("#goods-ul").find("li");
        p_lis_size = p_lis.size();        
        for(var ss= 0; ss < p_lis_size; ss++){
            f = $(p_lis[ss]);            
            var k = f.offset().top; // 这个元素（相对于文档）的 偏移距离
            // 偏移距离 大于windows 滚动距离 且 小于滚动距离+页面高度 的用来当作当前页数
            if (k >= d && k < (d + l)) {
                j = f.attr("data-page");
            }
        }        if(j){
            $("#currentPage").text(j);
        }

        e.show();
    }

}

Sample of each element on the page:

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