vue3中el-table实现表格合计行的示例代码

 <el-table :data="formDate.scoreList" style="width:100%;height: 96%;" stripe show-summary
      :summary-method="calculateSummary" :header-cell-style="{ textAlign: 'center', borderColor: ' #CCC', background: '#f5f7fa' }"
                        :cell-style="{ textAlign: 'center' }">
      <el-table-column type="index" label="序号" width="120"></el-table-column>
      <el-table-column type="puuid" label="uuid" v-if="false"></el-table-column>
</el-table>

// 合计
const calculateSummary = ({ columns, data }) => {
    const sums = []
    columns.forEach((column, index) => {
        if (index === 0) {
            sums[index] = '合计总分'
            return
        }
        const values = data.map((item) => Number(item[column.property]))
        // index === 3判断那一列求合计，下标从0开始
        if (!values.every((value) => Number.isNaN(value)) && index === 3) {
            sums[index] =` ${values.reduce((prev, curr) => {
                const value = Number(curr)
                if (!Number.isNaN(value)) {
                    return prev + curr
                } else {
                    return prev
                }
            }, 0)}`
        }
    })
    return sums
}

let activeList=ref('')
// 合计
const calculateSummary = ({ columns, data }) => {
    const sums = []
    columns.forEach((column, index) => {
        if (index === 0) {
            sums[index] = '合计总分'
            return
        }
        // 通过自定义参数判断除了表格中的数据外还额外加值
        let a = activeList.value == 'first' ? 21 : activeList.value == 'second' ? 12 : activeList.value == 'third' ? 18 : 3
         // 获取表格中的数据
        const values = data.map((item) => Number(item[column.property]))
        //index === 3判断那一列求合计，下标从0开始
        if (!values.every((value) => Number.isNaN(value)) && index === 3) {
            // 通过计算额外值a+表格中的合计值（模板字符串无法直接相加需要转换数据格式）
            sums[index] = a+Number(` ${values.reduce((prev, curr) => {
                const value = Number(curr)
                if (!Number.isNaN(value)) {
                    return prev + curr
                } else {
                    return prev
                }
            }, 0)}`)
        }
    })
    return sums
}