表单重置，表单有的属性都的有

<el-form :inline="true" :model="contentForm" ref="contentForm">//:model="contentForm" ref="contentForm"必须有
        <el-row>
          <el-col :span="6">
            <el-form-item label="工号" prop="approveStaffCode">// prop="approveStaffCode"必须有
              <el-input class="item_width" v-model.trim="contentForm.approveStaffCode" clearable placeholder="请输入工号">
              </el-input>
            </el-form-item>
          </el-col>
          <el-col :span="6">
            <el-form-item label="姓名" prop="approveStaffName">
              <el-input class="item_width" v-model.trim="contentForm.approveStaffName" clearable  placeholder="请输入姓名">
              </el-input>
            </el-form-item>
          </el-col>
          <el-col :span="6">
            <el-form-item label="用户状态" prop="status">
              <el-select class="item_width" v-model="contentForm.status" clearable placeholder="请选择用户状态">
                <el-option v-for="(item,index) in sectionList"
                           :key="index"
                           :label="item.name"
                           :value="item.status">
                </el-option>
              </el-select>
            </el-form-item>
          </el-col>
          <el-col :span="6">
            <el-form-item label="版块" prop="sectionCode">
              <select-section :sectionName="contentForm.sectionCode"  @sectionName="sectionCodeList" ></select-section>
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
  <div class="select_div">
        <el-button class="el_btn" type="primary" @click="searchResult">查询
        </el-button>
        <el-button class="el_btn" @click="resetForm('contentForm')">重置//重置方法
        </el-button>
      </div>
 </div>

2.重置方法

 //重置
      resetForm(formName){
        this.$refs[formName].resetFields();
      },