兼容IE8，滚动加载下一页

// 滚动加载下一页

        var nowScrolledHeight = document.documentElement.scrollTop || document.body.scrollTop;

        var docHeight = document.body.clientHeight;

        if(window.innerHeight!= undefined){

            var pageHeight = window.innerHeight;

        } else{

            var B= document.body, D= document.documentElement;

            var pageHeight = Math.min(D.clientHeight, B.clientHeight);

        }

        var go = parseInt(docHeight) - parseInt(pageHeight + 20);

        console.log(nowScrolledHeight)

        console.log(docHeight)

        console.log(pageHeight)

        console.log(go)

        if (nowScrolledHeight >= go && hasNext) {

            console.log('滚动成功');

            pageIndex++;

            searchGoods(word, pageIndex, orderType);

            $(".data_loading").show();

            $(".data_lastpage").hide();

        } else if(!hasNext){

            $(".data_loading").hide();

            $(".data_lastpage").show();

        }