| height | Height of elevator area | Number、String | `200px`
| acceptKey | Index key value | String | `title` |
| indexList | Index list | Array(`item` needs to contain `id` and `name` attributes, and `name` supports passing in `html` structure) | `[{id: 0, name: ''}]` |
| isSticky | Whether the index is ceiling | Boolean | `false` |
| spaceHeight | Up and down spacing of right anchor point | Number | `23` |
| titleHeight | Height of left index | Number | `35` |