77 lines
1.8 KiB
JavaScript
77 lines
1.8 KiB
JavaScript
const fs = require("fs");
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const request = require("request");
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const path = require("path");
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module.exports = {
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delay(seconds = 1, callback) {
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let promise = new Promise((resolve, reject) => {
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setTimeout(() => {
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if (callback) {
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callback();
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}
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resolve(true);
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}, seconds * 1000);
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});
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return promise;
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},
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mkdirsSync(dirname) {
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if (fs.existsSync(dirname)) {
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return true;
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} else {
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if (this.mkdirsSync(path.dirname(dirname))) {
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fs.mkdirSync(dirname);
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return true;
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}
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}
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},
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isExist(path) {
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let promise = new Promise((resolve, reject) => {
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fs.access(path, function (err) {
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if (err && err.code == "ENOENT") {
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resolve(false);
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}
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resolve(true);
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});
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});
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return promise;
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},
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/**
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* 计算两个地理坐标点之间的距离（Haversine公式）
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* @param {number} lat1 起点纬度
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* @param {number} lng1 起点经度
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* @param {number} lat2 终点纬度
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* @param {number} lng2 终点经度
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* @returns {number|null} 距离（公里），如果坐标无效则返回null
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*/
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calculateDistance(lat1, lng1, lat2, lng2) {
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// 验证坐标参数
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if (!lat1 || !lng1 || !lat2 || !lng2 ||
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isNaN(lat1) || isNaN(lng1) || isNaN(lat2) || isNaN(lng2)) {
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return null;
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}
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const R = 6371; // 地球半径（公里）
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const dLat = (lat2 - lat1) * Math.PI / 180;
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const dLng = (lng2 - lng1) * Math.PI / 180;
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const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
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Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
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Math.sin(dLng / 2) * Math.sin(dLng / 2);
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const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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const distance = R * c;
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// 保留两位小数
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return Math.round(distance * 100) / 100;
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},
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};
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