设置默认缺省图

src/main.js

@@ -48,5 +48,6 @@ import '@/assets/plugins/bootstrap-treeview/css/bootstrap-treeview.min.css'
 import '@/assets/plugins/bootstrap-treeview/js/bootstrap-treeview.min.js'
 
 import components from '@/utils/components.js'
+import mixin from '@/utils/mixin.js'
 
-createApp(App).use(store).use(router).use(components).mount('#app')
+createApp(App).mixin(mixin).use(store).use(router).use(components).mount('#app')

src/utils/ajaxfileupload.js

@@ -40,9 +40,14 @@ jQuery.extend({
         //create form	
         var formId = 'jUploadForm' + id;
         var fileId = 'jUploadFile' + id;
-        var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
+        var form = $('#' + formId);
+        if (form && form.length > 0) {
+            form.remove();
+        }
+        form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
         var oldElement = $('#' + fileElementId);    
-        var newElement = $(oldElement).clone();
+        var newElement = $(oldElement).clone(true).val("");    
+        //须要复制元素的全部事件处理。  
         $(oldElement).attr('id', fileId);    
         $(oldElement).before(newElement);    
         $(oldElement).appendTo(form);  

src/utils/mixin.js

@@ -0,0 +1,15 @@
+export default {
+    mounted() {
+        this.$nextTick(() => {
+            const images = document.getElementsByTagName('img')
+            for (let i = 0; i < images.length; i++) {
+                images[i].addEventListener('error', this.handleImageError)
+            }
+        })
+    },
+    methods: {
+        handleImageError(event) {
+            event.target.src = require('@/assets/images/default.png')
+        },
+    },
+}