---
title: "LayerSwitch 图层显隐控制"
language: "zh"
canonical: "https://l7.antv.antgroup.com/zh/examples/component/control/layerswitch/"
---

# LayerSwitch 图层显隐控制

[运行示例](https://l7.antv.antgroup.com/zh/examples/component/control/layerswitch/)

[资料索引](/llms.txt)

页面需要一个 `id="container"` 的 DOM 元素。以下为原始示例源码。

## 源码

```ts
import { GaodeMap, LayerSwitch, LineLayer, PolygonLayer, Scene } from '@antv/l7';

const scene = new Scene({
  id: 'map',
  map: new GaodeMap({
    pitch: 0,
    style: 'normal',
    center: [120.154672, 30.241095],
    zoom: 12,
  }),
});
scene.on('loaded', () => {
  const polygonLayer = new PolygonLayer({
    name: '填充图层',
  });
  polygonLayer
    .source({
      type: 'FeatureCollection',
      features: [
        {
          type: 'Feature',
          properties: {},
          geometry: {
            type: 'Polygon',
            coordinates: [
              [
                [120.143575, 30.239811],
                [120.143575, 30.247856],
                [120.151213, 30.247856],
                [120.151213, 30.239811],
                [120.143575, 30.239811],
              ],
            ],
          },
        },
      ],
    })
    .color('#ff0000')
    .style({
      opacity: 0.5,
    });
  scene.addLayer(polygonLayer);

  const lineLayer = new LineLayer({
    name: '边框图层',
  });
  lineLayer
    .source({
      type: 'FeatureCollection',
      features: [
        {
          type: 'Feature',
          properties: {},
          geometry: {
            type: 'Polygon',
            coordinates: [
              [
                [120.143575, 30.239811],
                [120.143575, 30.247856],
                [120.151213, 30.247856],
                [120.151213, 30.239811],
                [120.143575, 30.239811],
              ],
            ],
          },
        },
      ],
    })
    .color('#700000')
    .size(2);
  scene.addLayer(lineLayer);

  const layerSwitch = new LayerSwitch({
    layers: [polygonLayer, lineLayer],
  });
  scene.addControl(layerSwitch);
});
```

## 运行环境

运行示例前，先在含有 #container 的页面中等待以下初始化完成。相关文件附于文末。

```js
await (await import("/src/demo/setup.ts")).default({ container: document.getElementById('container'), path: "/examples/component/control/demo/layerswitch.ts" });
```


## src/demo/setup.ts

```ts
import type { DemoSetupContext } from '@antv/astro-theme-antv';
import * as District from 'district-data';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';

export default async function setup({ container, path }: DemoSetupContext) {
  // Tool pages provide their own React layout and SDK imports.
  if (!path.startsWith('/examples/')) return;
  // Retain only the original globals still used by gallery examples.
  Object.assign(window, { District, GLTFLoader });
  const map = document.createElement('div');
  map.id = 'map';
  container.append(map);
  await import('./map.css');
  // Match the original gallery's shared AMap environment, including raw AMap demos.
  await import('./amap');
}
```

## src/demo/map.css

```css
#map {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 320px;
}

.labelclass {
  position: absolute;
  display: inline;
  cursor: pointer;
  background: rgb(255, 228, 120);
  border: solid 2px #fff;
  padding: 4px;
  white-space: nowrap;
  font:
    bold 12px/18px arial,
    sans-serif;
  color: #fff;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  line-height: 30px;
  /* opacity: 0.7; */
  text-align: center;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
```

## src/demo/amap.ts

```ts
import AMapLoader from '@amap/amap-jsapi-loader';

// Preserve the site's development and production SDK registrations.
const credentials = import.meta.env.DEV
  ? { key: '6f025e700cbacbb0bb866712d20bb35c', securityJsCode: '290ddc4b0d33be7bc9b354bc6a4ca614' }
  : { key: 'f59bcf249433f8b05caaee19f349b3d7', securityJsCode: '2653011adeb04230b3a26cc9a780a800' };
window._AMapSecurityConfig = { securityJsCode: credentials.securityJsCode };
await AMapLoader.load({ key: credentials.key, version: '2.0', plugins: ['Map3D'] });
```