fix

 <template>
-    <div>
+    <div v-if="show">
         <div class="upload-image-item" v-if="uploadList[0]">
             <template v-if="uploadList[0].status === 'finished' || uploadList[0].url">
                 <img :src="uploadList[0].url">
@@ -57,6 +57,7 @@ export default {
         return {
             imgUrl: '',
             visible: false,
+            show: true,
             uploadList: [],
             defaultList: _this.defaultFile ? [{url: _this.defaultFile}] : []
         };
@@ -94,11 +95,25 @@ export default {
                 title: '超出文件大小限制',
                 desc: '文件 ' + file.name + ' 太大，不能超过 2M。'
             });
+        },
+        render: function() {
+            this.show = false;
+            this.$nextTick(() => {
+                this.show = true;
+            })
         }
     },
     mounted() {
         this.uploadList = this.$refs.upload.fileList;
     },
+    watch: {
+        defaultFile: function(newValue) {
+            if (newValue) {
+                this.$refs.upload.fileList.push({url: this.defaultFile});
+                this.render();
+            }
+        }
+    }
 };
 </script>
 <style>