清空el-form表单数据（整理）

<!-- 添加险种开始 -->
<el-dialog destroy-on-close title="添加业务事项" :visible.sync="mattersShow" class="add-video-dialog mattersBox"
  width="45%" v-if="mattersShow">
  <el-form :model="mattersForm" ref="mattersForm" label-width="8vw">
    <el-form-item label="业务事项">
      <el-select v-model="mattersForm.name" placeholder="请选择">
        <el-option label="在职" value="1"></el-option>
        <el-option label="离职" value="2"></el-option>
      </el-select>
    </el-form-item>
    <el-form-item class="create211 margin-top50">
      <el-button type="blue" style="margin-left: 0px;" @click="submitDeadline('mattersForm')">保存
      </el-button>
      <el-button type="grey" style="margin-left: 30px;" @click="cancelClick('mattersForm')">取消
      </el-button>
    </el-form-item>
  </el-form>
</el-dialog>
<!-- 添加险种结束 -->
方法一：this.mattersForm = this.$options.data().mattersForm  // 置空表单，mattersForm是表单的数据对象
方法二：v-if="mattersShow"
  在el-dialog标签上添加v-if="mattersShow"  :visible.sync="mattersShow"