js 实现根据参数返回对象内容的函数（类似i18n.t）

let objs = {
  a: {
    text: 'a',
    b: {
      text: 'b',
      c: {
        text: 'c',
        d: {
          text: 'd'
        }
      }
    }
  }
}
function getText (name, obj = objs) {
  if (!name) return
  let keys = name.split('.')
  let text = keys[0]
  if (keys.length === 1) {
    return obj[name]
  } else {
    keys.shift()
    let names = keys.join('.')
    return getText(names, obj[text])
  }
}
console.log(getText('a.text')) // a
console.log(getText('a.b.text')) // b
console.log(getText('a.b.c.text')) // c