小程序多语言环境自动切换：如何实现用户语言的精准获取和应用？

const api = {
  /**
   * 获取用户语言
   * @return {promise<string | undefined>}
   */
  getlanguage: () => new promise((resolve) => {
    settimeout(() => {
      /** @type {string | undefined} */
      const lang = 'zh_cn';
      resolve(lang);
    }, 1000);
  }),
};

/**
* 获取系统语言
* @return {promise<string>}
*/
const getsysteminfo = () => new promise((resolve) => {
  window.wx.getsysteminfo({
    success: (res) => {
      resolve(res.language);
    },
  });
});

/**
* 获取用户语言
* @return {promise<string>}
*/
const getlanguage = async() => {
  /** @type {string} */
  const defaultlanguage = 'zh_cn';

  /** @type {string | undefined} */
  const remotelanguage = await api.getlanguage();
  if (remotelanguage) {
    return remotelanguage;
  }

  /** @type {string} */
  const systemlanguage = await getsysteminfo();
  if (systemlanguage) {
    return systemlanguage;
  }

  // 兜底，不太可能发生
  return defaultlanguage;
};

const main = async() => {
  const language = getlanguage();

  // 将language注入到全局使用或者vue-i18n这类的国际化工具
};

main();

import { createApp } from 'vue'
import { createI18n } from 'vue-i18n'

const main = async() => {
  const language = await getLanguage();

  const messages = {
    zh: {
      apple: '苹果',
    },
    en: {
      apple: 'apple',
    },
  }

  const i18n = createI18n({
    locale: language,
    messages,
    // something vue-i18n options here ...
  })

  const app = createApp({
    // something vue options here ...
  })

  app.use(i18n)
  app.mount('#app')
}