整不明白Jquery的问题

最近写个GridView，由于不是很熟悉javascript，用jquery实现后，发现下面设置左右表行高的代码如果不把行保存在$tr1,$tr2中再设置css,速度非常慢，300行50列左右的数据得1分钟左右，如下修改后只要7，8秒。各位大大看看能否帮忙分析一下。$fixedTrs固定列的行，$freeTrs非固定列行。function resetRowHeight ($fixedTrs, $freeTrs){var rhs = [], l1 = $fixedTrs.length, l2 = $freeTrs.length,               $tr1 = [], $tr2 = [], minheight = parseInt(this.options.minRowHeight, 10) || 0;

            isNaN(minheight) && (minheight = 0);

for (var i = 0; i < l2; i++) {
                var tr1, tr2;
                $tr2[i] = tr2 = $freeTrs.eq(i).css({ "max-height": "", "height": "" });
                var rh = Math.max(minheight, tr2.children().height());
                if (l1 == l2) {
                    $tr1[i] = tr1 = $fixedTrs.eq(i).css({ "max-height": "", "height": "" });
                    rh = Math.max(rh, tr1.children().height());
                }
                rhs[i] = rh;
            }
            for (var j = 0; j < l2; j++) {
                var cssArgs = { "max-height": (rhs[j] + 2) + "px", "height": (rhs[j] + 2) + "px" };
                if (l1 == l2) {
                    $tr1[j].css(cssArgs);
                }
                $tr2[j].css(cssArgs);
            }
        }

整不明白Jquery的问题,布布扣,bubuko.com