mapsjs-core.js：27 uncatch TypeError： 无法读取 undefined 的属性(读取 '0')

Question

我需要的帮助

我使用这里的地图api，我试图显示城市周围的轮廓，这是一个错误

const shape = res.response.isoline[0].component[0].shape.map(z => z.split(','));

这是完整的代码

const requestIsolineShape=options=>{const params={'模式'：CCD_ 1，"启动"：CCD_ 2，'range'：选项.range，"rangetype"：选项。rangetype，‘出发’：CCD_ 3，}；

return new Promise((resolve，reject(=>{router.calculateIsoline(params，res=>{const shape=res.response.isoline[0]。component[0]。shape.map(z=>z.split('，'((；解析(形状(；}，err=>拒绝(错误()；})；}；

Answer 1

请在浏览器的控制台("网络"选项卡(中仔细检查哪些参数被发送到路由隔离线服务，并检查响应。

看来您正在使用路由API 7.2版，然后请在https://refclient.ext.here.com/-点击"；新标签+"；

如果您切换到路由API的新版本8并使用直接集成到JS API的此服务，则会获得更好的解决方案：https://developer.here.com/documentation/maps/3.1.30.7/api_reference/H.service.RoutingService8.html#calculateIsoline

示例：

let routingParams = {
'routingMode': 'fast',
'transportMode': 'car',
'origin':'52.5,13.4',
'range[type]': 'time',
'range[values]': '900',
};
// Define a callback function to process the routing response
let onResult = function(result) {
if (result.isolines.length) {
result.isolines[0].polygons.forEach((polygon) => {
// Create a linestring to use as a point source for the isoline
const linestring = H.geo.LineString.fromFlexiblePolyline(polygon.outer);
// Create a polygon and a marker representing the isoline
const isolinePolygon = new H.map.Polygon(linestring, {
style: { strokeColor: 'blue', lineWidth: 3 }
});
// Create a marker for the start point
const isolineCenter = new H.map.Marker(result.departure.place.location);
// Add the polygon and marker to the map
map.addObjects([isolinePolygon, isolineCenter]);
// Center and zoom the map so that the whole isoline polygon is
// in the viewport
map.getViewModel().setLookAtData({bounds: isolinePolygon.getBoundingBox()});
});
}
};
// Assumption: the platform is instantiated.
// Get an instance of the routing service
let router = platform.getRoutingService(null, 8);
// Call the Isoline Routing API to calculate an isoline
router.calculateIsoline(
routingParams,
onResult,
console.error
);

v8的游乐场：https://demo.routing.ext.here.com/