feat(i18n): 中英文框架(命名空间字典+语言切换)+profile 接入参考+注册3个新页面

miniprogram/i18n/index.js

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+// Lightweight i18n for WeChat Mini Program (no official i18n API).
+//
+// Usage in a page:
+//   var i18n = require('../../i18n/index')
+//   onShow: function () { i18n.bind(this) }   // injects `i18n` + `locale` into page data
+//   WXML:  {{i18n.common.loading}}   /   {{i18n.profile.title}}
+//   JS strings: i18n.t('common.loading')
+//
+// Locale is persisted in storage; switching locale notifies listeners and the
+// convention is that every page re-runs i18n.bind(this) in onShow, so tab pages
+// pick up the new language the next time they are shown.
+
+var locales = require('./locales/index')
+
+var STORAGE_KEY = 'app_locale'
+var DEFAULT_LOCALE = 'zh'
+var SUPPORTED = ['zh', 'en']
+var LOCALE_NAMES = { zh: '中文', en: 'English' }
+
+var _listeners = []
+var _current = null
+
+function getSystemLocale() {
+  try {
+    var sys = wx.getSystemInfoSync()
+    var lang = (sys.language || '').toLowerCase()
+    return lang.indexOf('en') === 0 ? 'en' : 'zh'
+  } catch (e) {
+    return DEFAULT_LOCALE
+  }
+}
+
+function getLocale() {
+  if (_current) return _current
+  var saved = ''
+  try { saved = wx.getStorageSync(STORAGE_KEY) } catch (e) {}
+  _current = SUPPORTED.indexOf(saved) !== -1 ? saved : getSystemLocale()
+  return _current
+}
+
+function setLocale(locale) {
+  if (SUPPORTED.indexOf(locale) === -1 || locale === _current) return
+  _current = locale
+  try { wx.setStorageSync(STORAGE_KEY, locale) } catch (e) {}
+  applyTabBar()
+  for (var i = 0; i < _listeners.length; i++) {
+    try { _listeners[i](locale) } catch (e) {}
+  }
+}
+
+function onChange(fn) { if (typeof fn === 'function') _listeners.push(fn) }
+function offChange(fn) {
+  _listeners = _listeners.filter(function (f) { return f !== fn })
+}
+
+function getDict() {
+  var loc = getLocale()
+  return locales[loc] || locales[DEFAULT_LOCALE]
+}
+
+function _lookup(dict, key) {
+  if (!dict) return undefined
+  var parts = key.split('.')
+  var cur = dict
+  for (var i = 0; i < parts.length; i++) {
+    if (cur == null) return undefined
+    cur = cur[parts[i]]
+  }
+  return cur
+}
+
+// t('profile.title', {name: 'x'}) — falls back to zh, then to the raw key.
+function t(key, params) {
+  var loc = getLocale()
+  var val = _lookup(locales[loc], key)
+  if (val === undefined) val = _lookup(locales[DEFAULT_LOCALE], key)
+  if (typeof val !== 'string') return val === undefined ? key : val
+  if (params) {
+    val = val.replace(/\{(\w+)\}/g, function (m, k) {
+      return params[k] !== undefined ? params[k] : m
+    })
+  }
+  return val
+}
+
+// Inject the full dictionary + current locale into a page/component's data.
+function bind(page) {
+  if (page && typeof page.setData === 'function') {
+    page.setData({ i18n: getDict(), locale: getLocale() })
+  }
+}
+
+// Refresh the bottom tabBar labels to the current locale.
+function applyTabBar() {
+  var d = getDict()
+  var tab = (d && d.common && d.common.tab) || {}
+  var items = [
+    { index: 0, text: tab.home },
+    { index: 1, text: tab.records },
+    { index: 2, text: tab.mine }
+  ]
+  items.forEach(function (it) {
+    if (!it.text) return
+    wx.setTabBarItem({ index: it.index, text: it.text, fail: function () {} })
+  })
+}
+
+module.exports = {
+  SUPPORTED: SUPPORTED,
+  LOCALE_NAMES: LOCALE_NAMES,
+  getLocale: getLocale,
+  setLocale: setLocale,
+  getSystemLocale: getSystemLocale,
+  onChange: onChange,
+  offChange: offChange,
+  getDict: getDict,
+  bind: bind,
+  applyTabBar: applyTabBar,
+  t: t
+}