多实例、容器与销毁

同页所有实例使用相同 assetBaseUrl。SDK 自动观察容器尺寸变化；每个容器必须有明确尺寸。销毁第二实例后可在同容器重建，页面卸载会销毁全部实例。

在线运行此例 · 完整功能演示 · 下载全部源码

运行方法

下载独立 Demo ZIP，解压后运行 npm ci、npm run dev，打开 http://127.0.0.1:5174/recipes.html?example=lifecycle。无需修改代码或配置 Key。文件路径为 src/examples/lifecycle.ts。

页面与初始化（所有示例共用）

以下文件已包含在 ZIP 中。复制到自己的 Vite 项目时应同时保留这些文件与本页的操作文件，入口是 recipes.html。安装 SDK/Cesium 并复制资源的步骤见快速开始。

完整 HTML 与入口

<!doctype html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="icon" href="data:," />
    <title>ShardX Map · 可运行教程</title>
  </head>
  <body>
    <nav id="recipes"></nav>
    <div id="actions"></div>
    <p id="status" role="status">正在加载…</p>
    <div id="map"></div>
    <script type="module" src="/src/recipes.ts"></script>
  </body>
</html>

import { createContext } from './examples/runtime';

const recipes = {
  markers: ['点、图片、DOM', () => import('./examples/markers')],
  clusters: ['点聚合', () => import('./examples/clusters')],
  geometry: ['线面样式', () => import('./examples/geometry')],
  geofence: ['围栏与遮罩', () => import('./examples/geofence')],
  model: ['3D Tiles', () => import('./examples/model')],
  popups: ['弹窗与事件', () => import('./examples/popups')],
  camera: ['相机、底图、昼夜', () => import('./examples/camera')],
  lifecycle: ['多实例与销毁', () => import('./examples/lifecycle')],
} as const;
for (const [id, [title]] of Object.entries(recipes)) {
  const link = document.createElement('a');
  link.href = `?example=${id}`;
  link.textContent = title;
  document.querySelector('#recipes')!.append(link);
}
const id = new URLSearchParams(location.search).get('example') || 'markers';
async function start() {
  if (!(id in recipes)) throw new Error('未知示例');
  const ctx = await createContext();
  try {
    const [, load] = recipes[id as keyof typeof recipes];
    await (await load()).setup(ctx);
    ctx.report('示例已就绪');
    document.body.dataset.ready = id;
  } catch (error) {
    ctx.dispose();
    throw error;
  }
}
void start().catch((error) => {
  document.querySelector('#status')!.textContent = String(error);
});

地图初始化、按钮、异常与清理

import { createMap } from '@shardx-map/sdk';
import type { MapInstance } from '@shardx-map/sdk';
import '@shardx-map/sdk/style.css';
import 'cesium/Build/Cesium/Widgets/widgets.css';
import './recipes.css';

export const view = { longitude: 114.05, latitude: 22.55, height: 50000, pitch: -90 };
export const assetBaseUrl = new URL(`${import.meta.env.BASE_URL}cesium/`, location.origin).href;
export type Context = Awaited<ReturnType<typeof createContext>>;

export async function createContext() {
  const cleanup: (() => void)[] = [];
  const report = (value: unknown) => {
    document.querySelector('#status')!.textContent = String(value);
  };
  const map = await createMap({
    container: 'map',
    assetBaseUrl,
    source: { type: 'naturalEarth' },
    view,
  });
  const dispose = () => {
    map.destroy();
    cleanup
      .splice(0)
      .reverse()
      .forEach((fn) => fn());
  };
  cleanup.push(
    map.on('error', (event) => {
      document.querySelector<HTMLElement>('#status')!.dataset.error = 'true';
      report(`${event.code}: ${event.message}`);
    }),
  );
  const action = (title: string, run: () => unknown | Promise<unknown>) => {
    const button = document.createElement('button');
    button.textContent = title;
    const click = async () => {
      button.disabled = true;
      try {
        await run();
      } catch (error) {
        document.querySelector<HTMLElement>('#status')!.dataset.error = 'true';
        report(error);
      } finally {
        button.disabled = false;
      }
    };
    button.addEventListener('click', click);
    document.querySelector('#actions')!.append(button);
    cleanup.push(() => {
      button.removeEventListener('click', click);
      button.remove();
    });
  };
  const track = (other: MapInstance) => cleanup.push(() => other.destroy());
  window.addEventListener('pagehide', dispose, { once: true });
  cleanup.push(() => window.removeEventListener('pagehide', dispose));
  if (import.meta.hot) import.meta.hot.dispose(dispose);
  return { map, cleanup, report, action, track, dispose };
}

完整 CSS

html,
body {
  margin: 0;
  height: 100%;
  font: 14px system-ui;
}
body {
  display: flex;
  flex-direction: column;
}
nav,
#actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 16px;
}
nav a {
  color: #1765cc;
  padding: 4px;
}
button {
  cursor: pointer;
  padding: 8px 12px;
}
#status {
  margin: 0;
  padding: 8px 16px;
  background: #eef3fa;
}
#map {
  flex: 1;
  min-height: 400px;
  position: relative;
}
.map-label {
  color: white;
  background: #174e8c;
  padding: 8px 12px;
  border-radius: 6px;
}
.second-map {
  position: fixed;
  right: 12px;
  bottom: 48px;
  width: 40vw;
  height: 40vh;
  z-index: 10;
}

完整操作代码

import { createMap } from '@shardx-map/sdk';
import type { MapInstance } from '@shardx-map/sdk';
import { assetBaseUrl, view } from './runtime';
import type { Context } from './runtime';

export async function setup({ map, action, cleanup }: Context) {
  const container = document.createElement('div');
  container.className = 'second-map';
  document.body.append(container);
  let second: MapInstance | undefined;
  cleanup.push(() => {
    second?.destroy();
    container.remove();
  });
  const create = async () => {
    if (second) return;
    second = await createMap({
      container,
      assetBaseUrl,
      source: { type: 'naturalEarth' },
      view: { ...view, height: 20000000 },
    });
    second.setLighting('night');
  };
  // All maps on a page use the same assetBaseUrl. Container resize is observed automatically.
  await create();
  action('销毁第二实例', () => {
    second?.destroy();
    second = undefined;
  });
  action('重建第二实例', create);
  action('调整容器宽度', () => {
    container.style.width = container.style.width === '60vw' ? '40vw' : '60vw';
  });
  action('主地图夜间', () => map.setLighting('night'));
}

异步初始化和操作异常会显示到状态栏；SDK 的异步资源错误通过 error 订阅显示。离开页面或 HMR 时执行清理队列、取消订阅并销毁地图，同时移除业务 DOM 监听器。