实现el-upload可以选择文件夹

1、设置el-upload ref的名字

<el-upload
     ref='uploadFile'
      action=""
      :multiple="false"
      :limit="1"
      :on-change="handleFileChange"
      :show-file-list="false"
      >
        <!-- :on-success="handleSuccess" -->
    <el-button>浏览</el-button>
  </el-upload>
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2、在mounted中加入如下代码

 mounted() {
       this.$refs.uploadFile.$children[0].$refs.input.webkitdirectory = true
    },
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