

```html
<div style="position: relative; z-index: 1; height: 500px; overflow: auto;">
  <l-root text="从“物料”中添加布局或组件">
	</l-root>
</div>
```


```html
<div style="position: relative; z-index: 1; height: 500px; overflow: auto;">
  <l-root active text="从“物料”中添加布局或组件">
	</l-root>
</div>
```

```html
<div style="position: relative; z-index: 1; height: 500px; overflow: auto;">
  <l-root text="从“物料”中添加布局或组件">
		  <u-button text="确定"></u-button>
	</l-root>
</div>
```