修复编辑图片的bug

src/pages/v2/categories/category.vue

@@ -113,7 +113,7 @@
               :disabled="urlDisabled">
               <i class="el-icon-plus"></i>
             </el-upload>
-            <el-dialog :visible.sync="visible">
+            <el-dialog :visible.sync="visible" append-to-body>
               <img width="100%" :src="mainForm.url" alt="">
               <el-input :v-model="mainForm.url" :value="mainForm.url"></el-input>
             </el-dialog>
@@ -157,7 +157,7 @@
               :disabled="urlDisabled">
               <i class="el-icon-plus"></i>
             </el-upload>
-            <el-dialog :visible.sync="visible">
+            <el-dialog :visible.sync="visible" append-to-body>
               <img width="100%" :src="childForm.url" alt="">
               <el-input :v-model="childForm.url" :value="childForm.url"></el-input>
             </el-dialog>