报错原因：row-key是必填项
解决：
1.el-table标签上添加:row-key=“getRowKey”

<el-table border :data="isNext?meetingData:tableData" ref="table" v-loading="loading"
              @selection-change="handleSelectionChange" :row-key="getRowKey"
	>

2.添加方法getRowKey

getRowKey(row) {
      return row.guid;
}