element-ui的table合计不准保留2位小数

// 合计 保留小数点后两位写法
        getSummaries({ columns, data }){
            const sums = [];
            columns.forEach((column, index) => {
                if (index == 0) {
                    sums[index] = "合计";
                } else {
                    if (index == 2) {
                        const values = data.map(item => Number(item[column.property]));
                        const flag = values.every(item => isNaN(item));
                        if (flag) {
                            return sums[index] = "N/A";
                        } else {
                            sums[index] = values.reduce((total, item) => total + item);
                            sums[index] = Math.round(sums[index] * 100) / 100;
                            sums[index] += " 元";
                        }
                    }    
                }
            });
            return sums;
        },