触底下拉

    $(window).scroll(function(){
        var flag=true;
        var scrollTop = $(this).scrollTop();    //滚动条距离顶部的高度
        var scrollHeight = $(document).height();   //当前页面的总高度
        var clientHeight = $(this).height();    //当前可视的页面高度
        // console.log("top:"+scrollTop+",doc:"+scrollHeight+",client:"+clientHeight);
        if(scrollTop + clientHeight+1 >= scrollHeight){   //距离顶部+当前高度 >=文档总高度 即代表滑动到底部
            //滚动条到达底部

            text = $(this).text();
            shou = $("#shou").val();
            wei = $("#wei").val();
            page=parseInt(shou)+1>wei?wei:parseInt(shou)+1
if(flag){
    flag=false;
    console.log(flag);
    $.ajax({
        url: "/home/index/goodslistpage",
        type: "post",
        data: {
            page: wei
        },
        success: function (data) {

            var flag=true;
            var str = ''
            $.each(data,function (k,v) {

                if(v.name!== undefined) {
                    var val=$("#a"+v.id).val();
                    console.log("#a"+v.id);
                    console.log(val);
                    if (val == undefined){
                        console.log(1);
                        str+="<div class='content-item'>"
                        str+="<input type='hidden' id='a"+ v.id+"' value='1'>"
                        str+=   "            <a href='#' onclick='showDetail(this)' id='"+v.id+"'>"
                        str+=   "                <img src='" + v.cover + "' class=\"slide-image\"/>"
                        str+=   "            </a>"
                        str+=   "            <div class='content-item-title'>"
                        str+=  "                <text style=\"color:#353535;\">"+v.name+"</text>"
                        str+=  "                <text style=\"font-size:20rpx; color:#a9a9a9;\">"+v.brand_name+"· "+v.c_sname+"</text>"
                        str+=   "            </div>"
                        str+=   "        </div>"
                    }else{
                        return false;
                        flag=false;
                    }

                }


            })
            if(flag){
                $('#wei').val(data.page);
                $(".cover").append(str)
            }

        }
    })

}