7.Node中使用i18n国际化

const express = require('express');
const i18n = require('i18n');
var path = require('path');
var app = express();

var server = app.listen(3000, function(){
    var host = server.address().address;
    var port = server.address().port;

    console.log('run', host, port);
});

//中间件
var setI18n = () => {
    const i18nOptions = {
        locales: ['en', 'zh-cn', 'zh-tw'],
        directory: path.join(__dirname, './src/locales/server'),
        objectNotation: true,
        updateFiles: true,
    };

    i18n.configure(i18nOptions);
    return i18n.init;
};

const setLang = (req, res, next) => {
    res.setLocale('zh-tw');
    next();
};

app.use(setI18n());
app.use(setLang);

//项目文件中的pug模版
app.set('views', [
    path.join('./src/', '/views/')
]);
app.set('./src', 'pug');

//渲染模版
app.get('/',function(req, res){
      res.render('partials/nav.pug', {
          config: {
              APP_NAME: 'books'
          }
      });
  });