1、举例组件代码

 <el-form ref="searchForm" :inline="true" :model="form" label-width="80px">
     <!--prop属性添加到form-item上,需要和绑定数据的最后名称一致-->
     <el-form-item label="名称:" prop="name">
     	<el-input v-model="form.name" placeholder="请输入内容"></el-input>
 	 </el-form-item>
     <el-form-item>
        <el-button type="primary" @click="onSubmit">确定</el-button>
        <el-button @click="resetForm('searchForm')">重置</el-button>
      </el-form-item>
 </el-form>

2、表单加ref属性：ref="searchForm"

<el-form ref="searchForm" :inline="true" :model="form" label-width="80px">

3、form的每个item加prop属性，否则无法清空,elementUI官方文档中也有说明

<el-form-item label="名称:" prop="name">
     <el-input v-model="form.name" placeholder="请输入内容"></el-input>
 </el-form-item>

4、绑定点击事件中传入"searchForm"

<el-form-item>
  <el-button @click="resetForm('searchForm')">重置</el-button>
</el-form-item>

5、注册事件

resetForm(searchForm) {
    this.$refs[searchForm].resetFields()//重置表单数据
}