/**
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@module 百度地图搜索服务 / import gcoord from "gcoord"; /*
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EPSG3857 坐标系
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在指定的区域执行关键字搜索
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@param {string} keyword
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@param {[number,number,number,number]} extent 范围[minx,miny,maxx,maxy] 是
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@returns {AsyncIterable<Feature>} 返回可异步迭代的要素结果集 返回的 EPSG3857 */ async function search(keyword, extent) { const pageCapacity = 50;/单页最多支持50个结果/ let [minx, miny, maxx, maxy] = extent; let centerPoint = [(minx + maxx) / 2, (miny + maxy) / 2] centerPoint = gcoord.transform(centerPoint, gcoord.EPSG3857, gcoord.BD09); const ls = new BMap.LocalSearch(new BMap.Point(centerPoint[0], centerPoint[1]), { pageCapacity }); const iterator = {}; let currentResult = new Promise(r => { ls.setSearchCompleteCallback(result => { iterator.count = result.getNumPois(); r(result); }); }); let i = 0; const [minx1, miny1] = gcoord.transform([minx, miny], gcoord.EPSG3857, gcoord.BD09); const [maxx1, maxy1] = gcoord.transform([maxx, maxy], gcoord.EPSG3857, gcoord.BD09); ls.searchInBounds(keyword, new BMap.Bounds(new BMap.Point(minx1, miny1), new BMap.Point(maxx1, maxy1))); await currentResult; iterator[Symbol.asyncIterator] = () => { return { async next() { let result = await currentResult; if (i >= result.getNumPois()) { return { done: true }; } if (i >= (result.getPageIndex() + 1) * pageCapacity) { ls.gotoPage(result.getPageIndex() + 1); currentResult = new Promise(r => { ls.setSearchCompleteCallback(result1 => r(result1)); }); result = await currentResult; } const index = i % pageCapacity; const poi = result.getPoi(index); i++; return { done: false, value: { geometry: { type: "Point", coordinates: gcoord.transform([poi.point.lng, poi.point.lat], gcoord.BD09, gcoord.EPSG3857) }, properties: { title: poi.title, address: poi.address, phoneNumber: poi.phoneNumber, tags: poi.tags instanceof Array ? poi.tags.join('/') : '', url: poi.detailUrl } } }; } } }
return iterator; }
来源：oschina
链接：https://my.oschina.net/yuantao/blog/3211426