el-table表格最后一列合计总分（可自定义某列的合计）

 前情提要：主要用到以下截图内容

1.效果

2.最后两列的计算比较特殊，上代码

	<el-table
        v-loading="tableLoading"
		:summary-method="getSummaries"  // 必须项1
        show-summary // 必须项2，目的是在尾部展示合计列
		:data="tableList">
    </el-table>


    methods：{
        getSummaries (param) {
			console.log(param, '参数')
			const { columns, data } = param;
			const sums = [];
			columns.forEach((column, index) => {
				console.log(column, index)
				if (index === 0) { // 其他列
					sums[index] = '合计/总分';
					return;
				}
				const values = data.map(item => Number(item[column.property]));
				if (!values.every(value => isNaN(value))) {
					sums[index] = values.reduce((prev, curr) => {
						const value = Number(curr);
						if (!isNaN(value)) {
							return prev + curr;
						} else {
							return prev;
						}
					}, 0);
					sums[index];
				} else {
					sums[index] = 'N/A';
				}

				if (index === 5) { // 个人得分率
					var num = (sums[2] / sums[1]) * 100;
					if (!num == 0) {
						num = num.toFixed(2);
						sums[index] = num;
					} else {
						sums[index] = "0";
					}
				}

				if (index === 6) { // 平均得分率
					var number = (sums[3] / sums[1]) * 100;
					if (!number == 0) {
						number = number.toFixed(2);
						sums[index] = number;
					} else {
						sums[index] = "0";
					}
				}
			})

			return sums;
		},

  }