update：更新

src/components/app-file-upload/app-file-upload.vue

@@ -10,6 +10,7 @@
           :file-list="files"
           :action="uploadUrl"
           :limit="multiple ? limit: 1"
+          :accept="accept"
           :multiple="multiple"
           :headers="{}"
           :before-upload="beforeUpload"
@@ -21,7 +22,7 @@
           :show-file-list="!rowPreview"
           :on-exceed = "handleExceed"
           >
-            <el-button v-if="!isdrag" size='small' icon='el-icon-upload' :disabled="disabled">{{this.$t('app.fileUpload.caption')}}</el-button>
+            <el-button v-if="!isdrag" size='small' icon='el-icon-upload' :disabled="disabled || !(multiple || files.length === 0)">{{this.$t('app.fileUpload.caption')}}</el-button>
           <i v-if="isdrag" class="el-icon-upload"></i>
           <div v-if="isdrag" class="el-upload__text" v-html="$t('components.appFileUpload.uploadText')"></div>
         </el-upload>