isChinaUser/src/isChinaByEmoji.ts at main · yArna/isChinaUser · GitHub
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/** 通过 Emoji 判断当前设备是否是中国大陆用户
* 如果 🇹🇼 字符无法彩色显示（渲染为黑白字母或完全不渲染），说明更像中国大陆设备
* 为了避免误报，会先用 😀 做对照：
* 如果设备连普通 Emoji 都无法彩色渲染（如无彩色 Emoji 字体的 Linux、
* 开启指纹保护的浏览器），返回 null 表示无法判断，而不是误报为 true
* 如果是 Windows 环境，不能通过此方法判断，因为 Windows 所有国旗 Emoji 都不支持显示 */
export function isChinaByEmoji(): boolean | null {
if (typeof document === "undefined") return null;
if (isWindows()) return null;
try {
// 对照组：😀 在所有支持彩色 Emoji 的设备上都应渲染为彩色
const control = getCharColors("😀");
if (control.opaquePixelCount === 0 || control.isMono) {
// 设备本身不支持彩色 Emoji 渲染（或 canvas 被指纹保护干扰），无法判断
return null;
const flag = getCharColors("🇹🇼");
if (flag.opaquePixelCount === 0) {
// 对照组正常但旗帜完全不渲染 → 系统屏蔽了该 Emoji
return true;
// 渲染为黑白（通常是 "TW" 字母回退）→ 系统屏蔽了旗帜图案
return flag.isMono;
} catch {
// canvas 不可用（如某些无头环境）时返回无法判断，而不是抛错
return null;
function getCharColors(char: string): {
colors: number[][];
isMono: boolean;
opaquePixelCount: number;
} {
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
const fontSize = 100;
if (!ctx) {
throw new Error("Canvas context not supported");
canvas.width = fontSize;
canvas.height = fontSize;
// 使用系统字体渲染
ctx.font = `${fontSize}px sans-serif`;
ctx.fillStyle = "black";
ctx.textBaseline = "top";
// 渲染字符到画布
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillText(char, 0, 0);
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const colorSet = new Setstring>();
let isMono = true;
let opaquePixelCount = 0;
for (let i = 0; i imageData.data.length; i += 4) {
const r = imageData.data[i];
const g = imageData.data[i + 1];
const b = imageData.data[i + 2];
const a = imageData.data[i + 3];
if (a > 0) {
opaquePixelCount++;
const color = `${r},${g},${b}`;
colorSet.add(color);
// 判断颜色是否为黑白（即 R、G、B 值相同）
if (isMono && !(r === g && g === b)) {
isMono = false;
// 转换 Set 为二维颜色数组
const colors = Array.from(colorSet).map((color) =>
color.split(",").map(Number),
);
canvas.remove();
return {
colors,
isMono,
opaquePixelCount,
};
/** 判断是否为 Windows 系统 */
function isWindows(): boolean {
if (navigator.platform?.startsWith("Win")) return true;
// navigator.platform 已被废弃，部分浏览器可能返回空，回退到 userAgent
return /Windows/i.test(navigator.userAgent ?? "");
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