element-ui表格el-table回显时默认全选数据

<el-table ref="multipleTable":data="tableData"style=" 100%":header-cell-style="{ 'background-color': '#F9F9F9' }"@selection-change="handleSelectionChange"
        >
          <el-table-column type="selection"width="45":selectable="selectable"> </el-table-column>
          <el-table-column prop="pictureUrl"label="商品图片">
            <template slot-scope="scope">
              <img :src="scope.row.pictureUrl"height="50px" />
            </template>
          </el-table-column>
          <el-table-column prop="productName"label="商品名称">
          </el-table-column>
          <el-table-column prop="unitPrice"label="单价(含税)">
            <template slot-scope="scope">
              <span class="price">¥{{ scope.row.unitPrice || "0.00" }}</span>
            </template>
          </el-table-column>
          <el-table-column prop="resourcesNo"label="资源号"> </el-table-column>
          <el-table-column prop="baleNo"label="捆包号"> </el-table-column>
          <el-table-column prop="grossWeight"label="重量(吨)"> </el-table-column>
          <el-table-column prop="grossWeight"label="状态">
            <template slot-scope="scope">
              <el-tag size="small":type="scope.row.productState === 1 ? 'success':'info'">{{scope.row.productState === 1 ? '可用':'失效'}}
              </el-tag>
            </template>
          </el-table-column>
          <el-table-column prop="createTime"label="添加时间"> </el-table-column>
          <el-table-column prop="address"label="操作"width="100">
            <template slot-scope="scope">
              <el-button v-if="scope.row.productState === 1"size="mini"class="delete"@click="delRows(scope.row)"
                >删除</el-button>
              <el-button v-else size="mini"class="edit"@click="delRows(scope.row)"
              >移除失效商品</el-button>
            </template>
          </el-table-column>
        </el-table>
        <div class="paginations"v-show="total>page.pageSize">
          <el-pagination
                  background
                  layout="prev, pager, next":total="total":page-size="page.pageSize"@current-change="pagesClick"

          >
          </el-pagination>
        </div>

watch: {
    'tableData': function() {
      this.$nextTick(() =>{
        this.tableData.forEach((item) =>{
          if (item.productState === 1) {
            this.$refs.multipleTable.toggleRowSelection(item, true);
          }
        })
      })
    },
  },