@huaiyinhcy/trans-coord/dist/index.js

支持墨卡托（Mercator）、WGS84、高德（GCJ02）、百度（BD09）之间的坐标转换，无需调用外部接口，可在本地直接执行。

import { toMercator as g, toWgs84 as q, point as m } from "@turf/turf";
const r = Math.PI, d = 6378245, u = 0.006693421622965943, c = r * 3e3 / 180;
function W([t, o]) {
  return t < 72.004 || t > 137.8347 ? !0 : o < 0.8293 || o > 55.8271;
}
function G([t, o]) {
  let s = L(t - 105, o - 35), n = B(t - 105, o - 35);
  const a = o / 180 * r;
  let e = Math.sin(a);
  e = 1 - u * e * e;
  const i = Math.sqrt(e);
  return s = s * 180 / (d * (1 - u) / (e * i) * r), n = n * 180 / (d / i * Math.cos(a) * r), [n, s];
}
function L(t, o) {
  let s = -100 + 2 * t + 3 * o + 0.2 * o * o + 0.1 * t * o + 0.2 * Math.sqrt(Math.abs(t));
  return s += (20 * Math.sin(6 * t * r) + 20 * Math.sin(2 * t * r)) * 2 / 3, s += (20 * Math.sin(o * r) + 40 * Math.sin(o / 3 * r)) * 2 / 3, s += (160 * Math.sin(o / 12 * r) + 320 * Math.sin(o * r / 30)) * 2 / 3, s;
}
function B(t, o) {
  let s = 300 + t + 2 * o + 0.1 * t * t + 0.1 * t * o + 0.1 * Math.sqrt(Math.abs(t));
  return s += (20 * Math.sin(6 * t * r) + 20 * Math.sin(2 * t * r)) * 2 / 3, s += (20 * Math.sin(t * r) + 40 * Math.sin(t / 3 * r)) * 2 / 3, s += (150 * Math.sin(t / 12 * r) + 300 * Math.sin(t / 30 * r)) * 2 / 3, s;
}
const f = {
  toWgs84: (t) => {
    const o = q(m(t)).geometry.coordinates;
    return [o[0], o[1]];
  },
  toGcj02: (t) => M.toGcj02(f.toWgs84(t)),
  toBd09: (t) => h.toBd09(f.toGcj02(t))
}, M = {
  toMerc: (t) => g(m(t)).geometry.coordinates,
  toGcj02: ([t, o]) => {
    if (!W([t, o])) {
      const [s, n] = G([t, o]);
      t += s, o += n;
    }
    return [t, o];
  },
  toBd09: (t) => h.toBd09(M.toGcj02(t))
}, h = {
  toWgs84: ([t, o]) => {
    if (!W([t, o])) {
      const [s, n] = G([t, o]);
      t -= s, o -= n;
    }
    return [t, o];
  },
  toBd09: ([t, o]) => {
    let s = t, n = o;
    const a = Math.sqrt(s * s + n * n) + 2e-5 * Math.sin(n * c), e = Math.atan2(n, s) + 3e-6 * Math.cos(s * c);
    return s = a * Math.cos(e) + 65e-4, n = a * Math.sin(e) + 6e-3, [s, n];
  },
  toMerc: (t) => M.toMerc(h.toWgs84(t))
}, j = {
  toWgs84: (t) => h.toWgs84(j.toGcj02(t)),
  toGcj02: ([t, o]) => {
    let s = t - 65e-4, n = o - 6e-3;
    const a = Math.sqrt(s * s + n * n) - 2e-5 * Math.sin(n * c), e = Math.atan2(n, s) - 3e-6 * Math.cos(s * c);
    return s = a * Math.cos(e), n = a * Math.sin(e), [s, n];
  },
  toMerc: (t) => M.toMerc(j.toWgs84(t))
};
export {
  j as bd09,
  h as gcj02,
  f as merc,
  M as wgs84
};