fix: betdch upload

src/components/BatchImageAdd/index.vue

@@ -6,15 +6,19 @@
           ref="upload"
           accept="image/*"
           :action="uploadUrl"
+          drag
           :file-list="fileList"
           :headers="uploadHeaders"
-          list-type="picture-card"
           :multiple="true"
           :on-preview="handlePreview"
           :on-remove="handleRemove"
           :on-success="handleSuccess"
         >
-          <i class="el-icon-plus"></i>
+          <i class="el-icon-upload"></i>
+          <div class="el-upload__text">
+            将文件拖到此处，或
+            <em>点击上传</em>
+          </div>
         </el-upload>
         <el-dialog append-to-body :visible.sync="previewVisible">
           <img alt="" :src="previewImageUrl" width="100%" />