想在onLoad中调用，提示
VM3568:1 thirdScriptError
Cannot read property 'includePoints' of undefined;at pages/index/index page lifeCycleMethod onLoad function
TypeError: Cannot read property 'includePoints' of undefined
at s.onLoad (http://127.0.0.1:32768/appservice/pages/index/index.js:1167:16)
at s.
at s.__callPageLifeTime__ (http://127.0.0.1:32768/appservice/__dev__/WAService.js:1:979050)
at kt (http://127.0.0.1:32768/appservice/__dev__/WAService.js:1:998756)
at http://127.0.0.1:32768/appservice/__dev__/WAService.js:1:1001435
at It (http://127.0.0.1:32768/appservice/__dev__/WAService.js:1:1001498)
at Function.
at Be.
at Be.emit (http://127.0.0.1:32768/appservice/__dev__/WAService.js:1:333900)
at Object.emit (http://127.0.0.1:32768/appservice/__dev__/WAService.js:1:353303)
，点击是调用好使，在onLoad中就报错，请问什么原因？
this.mapCtx.includePoints({
padding: [10],
points: [{
latitude: latitude,
longitude: longitude,
}, {
latitude: endlat,
longitude: endlng,
}]
});
