ecology8冻结明细表标题行和指定前几列

数据量大的时候性能不佳，望大神指点！

/**
 * 冻结表格的标题行和指定列数
 * @param {*} detailNumber 明细表编号
 * @param {*} frozenColumnsCount 冻结的列数
 * @param {*} visibleRowsCount 可视数据行数
 */
function freezeRowsAndColumns(detailNumber, frozenColumnsCount, visibleRowsCount) {
    setTimeout(function () {//延迟一秒，等待页面加载完毕后执行
        var divId = "detailDiv_" + (detailNumber - 1);
        var titleRowCount = $("#" + divId + " table").find("tr[_target='headrow']").length;
        var dataRowCount=$("#" + divId + " table").find("tr[_target='datarow']").length;
        var tmpRowCount=dataRowCount>visibleRowsCount?visibleRowsCount:dataRowCount;
        var trHeight = $("#" + divId + " table").find("tr[_target='headrow']").eq(0).height();//行高
        var visibleHeight = (tmpRowCount + titleRowCount) * trHeight+22;//可视高度=（数据行数+标题行数）*行高
        $("#" + divId).css({ "overflow-y": "auto", "height": visibleHeight + "px" });//固定div（容器）高度 
        $("#" + divId).scroll(function () {//给table外面的div滚动事件绑定一个函数
            var left = $("#" + divId).scrollLeft();//获取滚动的距离
            var top = $("#" + divId).scrollTop();//获取滚动的距离
            $("#" + divId + " table>tbody>tr>td").each(function () {//遍历所有td
                //筛选出类包含detail_x_y的td
                var strs = $(this).attr("class");
                if (!strs) {
                    return true;
                }
                var classes = strs.split(" ");
                var rowIndex;
                var columnIndex;
                $.each(classes, function (i, v) {
                    if (v.startWith("detail")) {
                        var tmpStrs = v.split("_");
                        rowIndex = tmpStrs[1];
                        columnIndex = tmpStrs[2];
                        return false;
                    }
                });
                if (!rowIndex||(rowIndex==0&&columnIndex==0)) {
                    return true;
                }
                //设置css
                var color = $(this).css("background-color");
                color = color == "rgba(0, 0, 0, 0)" ? "white" : color;
                if (rowIndex < titleRowCount && columnIndex < frozenColumnsCount) {//行列都固定的区域
                    $(this).css({ "position": "relative", "top": top, "left": left, "background-color": color, "z-index": "10" });
                } else if (columnIndex < frozenColumnsCount) {//只固定列的区域
                    $(this).css({ "position": "relative", "top": "0px", "left": left, "background-color": color });
                } else if (rowIndex < titleRowCount) {//只固定行的区域
                    $(this).css({ "position": "relative", "top": top, "left": "0px", "background-color": color });
                }
            });
            //修正带有增减按钮的行
            var btnDiv=$("#div"+(detailNumber-1)+"button");
            if(btnDiv){
                btnDiv.closest("tr").children("td").css({ "position": "relative", "top": top, "left": "0px", "background-color": "white", "z-index": "10" });
                btnDiv.closest("td").css({ "position": "relative", "top": top, "left": left, "background-color": "white", "z-index": "11" });
            }
        });
    }, 200);
    String.prototype.startWith = function (s) {
        if (s == null || s == "" || this.length == 0 || s.length > this.length)
            return false;
        if (this.substr(0, s.length) == s)
            return true;
        else
            return false;
        return true;
    }
}