原生脚本自定义协议

import {map, addProtocol, removeProtocol} from 'sqsmap';
// This sample JSON contains ASCII characters only.
const text = JSON.stringify({type: 'FeatureCollection', features: [
  {type: 'Feature', id: 1, properties: {},
   geometry: {type: 'Point', coordinates: [116.4, 39.9]}}
]});
const bytes = new Uint8Array(Array.from(text, c => c.charCodeAt(0)));
addProtocol('local', (request, controller) => {
  controller.signal.throwIfAborted();
  if (request.url !== 'local://sample/point.json') throw Error('Unknown resource');
  return {data: bytes};
});
const ready = new Promise((resolve, reject) => {
  let loaded, failed;
  const close = () => {loaded.unsubscribe(); failed.unsubscribe();};
  loaded = map.on('sourcedata', event => {
    if (event.sourceId === 'sample' && event.isSourceLoaded) {close(); resolve();}
  });
  failed = map.on('error', event => {
    if (event.sourceId === 'sample') {close(); reject(Error(event.error.message));}
  });
});
map.addSource('sample', {type: 'geojson', data: 'local://sample/point.json'});
await map.sqs.flush();
await ready;
map.addLayer({id: 'points', type: 'circle', source: 'sample',
  paint: {'circle-radius': 8, 'circle-color': 'red'}});
map.jumpTo({center: [116.4, 39.9], zoom: 12});
await map.sqs.flush({render: true});
removeProtocol('local');