elmentUI的table中加上合计行之后显示不出来

 1 <el-table
 2           ref="table"
 3           id="ascendDetailTable"
 4           :data="tableData"
 5           border
 6           height="100%"
 7           :summary-method="getSummaries"
 8           show-summary
 9           style="width:100%;height:99%;overflow:hidden;">
10           <el-table-column
11             prop="name"
12             label="名称"
13             width="180"
14             sortable>
15           </el-table-column>
16           <el-table-column
17             prop="addr"
18             showOverflowTooltip
19             sortable
20             label="地址">
21           </el-table-column>
22           <el-table-column
23             prop="customerNum"
24             label="户数"
25             sortable>
26           </el-table-column>
27           <el-table-column
28             prop="contacter"
29             label="联系人">
30           </el-table-column>
31         </el-table>

 1 getSummaries(param) {
 2       this.$nextTick(() => {
 3         if (data.length > 1) document.getElementById('ascendDetailTable').style.height = '98%'
 4       })
 5       const { columns, data } = param
 6       const sums = []
 7       columns.forEach((column, index) => {
 8         if (index === 0) {
 9           sums[index] = '合计:'
10           return
11         }
12         if (index === 1) {
13           sums[index] = this.tableData.length + '个'
14           return
15         }
16         if (index === 2) {
17           const values = data.map(item => Number(item[column.property]))
18           if (!values.every(value => isNaN(value))) {
19             sums[index] = values.reduce((prev, curr) => {
20               const value = Number(curr)
21               if (!isNaN(value)) {
22                 return prev + curr
23               } else {
24                 return prev
25               }
26             }, 0)
27             sums[index] += ' 户'
28           } else {
29             sums[index] = 'N/A'
30           }
31           return
32         } else {
33           sums[index] = ''
34           return
35         }
36       })
37       return sums
38     }