element-ui的upload组件的clearFiles方法的调用

element-ui使用中碰到的问题

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<template>     <div>         <el-button @click="clearFiles">重新上传</el-button>         <el-upload ref="my-upload">             <el-button type="primary">点击上传</el-button>         </el-upload>     </div> </template>

　　

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<script>     export default {         data(){             return {         }     },     methods: {         clearFiles () {             this.$refs['my-upload'].clearFiles();         }     } };