树添加滚动条

src/views/modules/news/moduletype-add-or-update.vue

@@ -42,7 +42,7 @@
           <el-input v-model="dataForm.typeCode" placeholder="类别编码"></el-input>
       </el-form-item>
         <el-form-item prop="parentName" label="上级分类" class="category-list">
-            <el-popover v-model="categoryListVisible" ref="categoryListPopover" placement="bottom-start" trigger="click">
+            <el-popover v-model="categoryListVisible" popper-class="scroll-tree" ref="categoryListPopover" placement="bottom-start" trigger="click">
                 <el-tree :data="categoryList"
                          :props="{ label: 'typeName', children: 'children' }"
                          node-key="id"
@@ -302,4 +302,9 @@ export default {
         height: 178px;
         display: block;
     }
+    .scroll-tree {
+        width: 500px;
+        height: 600px;
+        overflow: auto;
+    }
 </style>