Leaflet 未捕获的TypeError:_arc2.default.GreatCircle不是构造函数

Leaflet 未捕获的TypeError:_arc2.default.GreatCircle不是构造函数,leaflet,automatic-ref-counting,react-leaflet,Leaflet,Automatic Ref Counting,React Leaflet,正在尝试为react传单创建插件。我在工作时遇到了这个错误 我回来了 L.Polyline.Arc(位置.from,位置.to,选项) 这是我的组件 import React, { PropTypes } from 'react'; import { Path } from 'react-leaflet'; import L from 'leaflet' import { Arc } from './leaflet.arc'; export default class ArcLine ext

正在尝试为react传单创建插件。我在工作时遇到了这个错误 我回来了

L.Polyline.Arc(位置.from,位置.to,选项)

这是我的组件

import React, { PropTypes } from 'react';
import { Path } from 'react-leaflet';
import L from 'leaflet'
import { Arc } from './leaflet.arc';


export default class ArcLine extends Path {
  static propTypes = {
    children: PropTypes.oneOfType([
      PropTypes.arrayOf(PropTypes.node),
      PropTypes.node,
    ]),
    option:PropTypes.object,
    position: PropTypes.object.isRequired
  };

  createLeafletElement (props) {
    const { position, option, ...options } = props
    return L.Polyline.Arc(position.from, position.to, option)
  }

  updateLeafletElement (fromProps, toProps) {
    if (toProps.position !== fromProps.position) {
      this.leafletElement._createLatLngs(line, toProps.position.from)
    }
    this.setStyleIfChanged(fromProps, toProps)
  }
}
/传单.arc是

import arc from 'arc';
/**
 * Transform L.LatLng to {x, y} object
 * @param {L.LatLng} latlng
 * @returns {{x: {number}, y: {number}}}
 * @private
 */
const _latLngToXY = latlng => ({
    x: latlng.lng,
    y: latlng.lat
});

/**
 * Create array of L.LatLng objects from line produced by arc.js
 * @param {object} line
 * @param {L.LatLng} from
 * @private
 * @returns {Array}
 */
function _createLatLngs(line, from) {
    if (line.geometries[0] && line.geometries[0].coords[0]) {
        /**
         * stores how many times arc is broken over 180 longitude
         * @type {number}
         */
        let wrap = from.lng - line.geometries[0].coords[0][0] - 360;

        return line.geometries
            .map(subLine => {
                wrap += 360;
                return subLine.coords.map(point => L.latLng([point[1], point[0] + wrap]));
            })
            .reduce((all, latlngs) => all.concat(latlngs));
    } else {
        return [];
    }
}

if (!L) {
    throw "Leaflet.js not included";
}  else if (!arc && !arc.GreatCircle) {
    throw "arc.js not included";
} else {
    L.Polyline.Arc = function (from, to, options) {
        from = L.latLng(from);
        to = L.latLng(to);
debugger

        var vertices = 10;
        var arcOptions = {};
        if (options) {
            if (options.offset) {
                arcOptions.offset = options.offset;
                delete options.offset;
            }
            if (options.vertices) {
                vertices = options.vertices;
                delete options.vertices;
            }
        }

        var generator = new arc.GreatCircle({x: from.lng, y: from.lat}, {x: to.lng, y: to.lat});

        var line = generator.Arc(vertices, arcOptions);
        var latLngs = [];

        var wrap = 0; // counts how many times arc is broken over 180 degree
        if (line.geometries[0] && line.geometries[0].coords[0])
            wrap = from.lng - line.geometries[0].coords[0][0];

        line.geometries.forEach(function(line) {
            line.coords.forEach(function (point) {
                latLngs.push(L.latLng(
                    [point[1], point[0] + wrap]
                ));
            });
            wrap += 360;
        });
        line.geometries[0].coords
        return L.polyline(latLngs, options);
    };
}
为什么我会遇到这个错误,有什么建议吗?

在这行:

import { Arc } from './leaflet.arc'
…您正试图从
传单.Arc
文件导入Arc变量。但是,在
传单.arc
文件中,看起来您并没有导出任何内容,只需将arc函数附加到传单的多段线对象。此外,在组件中的代码中,您甚至没有使用要导入的
Arc
变量。因此,代码失败,因为试图从
spoolet.arc
的未定义导出读取属性。似乎您应该只导入文件而不尝试导入任何对象

TLDR:

替换此行:

import { Arc } from './leaflet.arc'
为此:

import './leaflet.arc'

我也试过了,但同样的错误。使用调试器时,我的代码正在工作,数据会按我看到的那样传递,但当var generator=new arc.GreatCircle({x:from.lng,y:from.lat},{x:to.lng,y:to.lat})时,数据会停止传递;如果(!arc&&!arc.GreatCircle){尝试将这一行更改为:
}如果(!arc | |!arc.GreatCircle){
在您的传单.arc文件中。它表示未包含Uncaught arc.js,并且带有console.log(arc)我得到一个空对象。但我已经包含了arc。您是否在package.json中包含了arc并安装了它?是的,我使用了npm安装--save arc,在packge json中我得到了依赖项“arc”:“^0.1.0”