Applicable to stacked bar charts and stacked bar charts, the link area component provides visual assistant identification by drawing the link area of the same field, which is convenient for data comparison.

<description>**optional** _object_ | _false_</description>

| Properties | Type             | Required     | Default ｜ Description |
| ---------- | ---------------- | ------------ | ---------------------- |
| trigger    | 'hover'、'click' | No ｜'hover' | Trigger method         |
