fix-bug -- 使用TreeSelect组件后，重置按钮无法置空该组件值

wenhan

2022-01-12 103b08937aeb945a0ff503dfdedf268b9a55dade

 src/components/FileUpload/index.vue

@@ -14,7 +14,7 @@
      ref="upload"

    >

      <!-- 上传按钮 -->

      <el-button size="mini" type="primary">选取文件</el-button>

      <el-button type="primary">选取文件</el-button>

      <!-- 上传提示 -->

      <div class="el-upload__tip" v-if="showTip">

        请上传