程式庫

如要載入 Maps JavaScript API 的 JavaScript 程式碼，您需要在網頁中加入「bootstrap」載入器指令碼，格式如下：

<script>
  (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
    key: "YOUR_API_KEY",
    v: "weekly",
    // Use the 'v' parameter to indicate the version to use (weekly, beta, alpha, etc.).
    // Add other bootstrap parameters as needed, using camel case.
  });
</script>

Maps JavaScript API 是由「程式庫」組成，這類程式庫只有在您明確要求時才會載入。將元件分散到各個程式庫中，有助於快速載入 (及剖析) API。這樣就只有在需要載入及剖析程式庫時，才會使系統承受額外負荷。

使用 await 運算子在 async 函式中呼叫 importLibrary()，即可在執行階段載入其他程式庫。例如：

const { Map } = await google.maps.importLibrary("maps");

以下程式碼範例說明如何一併載入 Map 和 AdvancedMarkerElement 程式庫：

TypeScript

// Initialize and add the map
let map;
async function initMap(): Promise<void> {
  // The location of Uluru
  const position = { lat: -25.344, lng: 131.031 };

  // Request needed libraries.
  //@ts-ignore
  const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary;

  // The map, centered at Uluru
  map = new Map(
    document.getElementById('map') as HTMLElement,
    {
      zoom: 4,
      center: position,
      mapId: 'DEMO_MAP_ID',
    }
  );

  // The marker, positioned at Uluru
  const marker = new AdvancedMarkerElement({
    map: map,
    position: position,
    title: 'Uluru'
  });
}

initMap();
index.ts

JavaScript

// Initialize and add the map
let map;

async function initMap() {
  // The location of Uluru
  const position = { lat: -25.344, lng: 131.031 };
  // Request needed libraries.
  //@ts-ignore
  const { Map } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker");

  // The map, centered at Uluru
  map = new Map(document.getElementById("map"), {
    zoom: 4,
    center: position,
    mapId: "DEMO_MAP_ID",
  });

  // The marker, positioned at Uluru
  const marker = new AdvancedMarkerElement({
    map: map,
    position: position,
    title: "Uluru",
  });
}

initMap();
index.js

可用的程式庫

下列程式庫可與動態程式庫匯入和直接指令碼載入標記搭配使用：

下列 Bootstrap 要求示範如何在直接指令碼載入標記中，新增 Maps JavaScript API google.maps.geometry 程式庫的要求：

<script async
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&loading=async&libraries=geometry&callback=initMap">
</script>

如想要求多個程式庫，請使用半形逗號隔開：

<script async
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&loading=async&libraries=geometry,places&callback=initMap">
</script>