js 异步回调

https://segmentfault.com/a/1190000017935821

  let girlName = "裘千尺"

  function hr(callBack) {
    setTimeout(() => {
      girlName = "黄蓉"
      console.log('我是黄蓉');
      callBack()
    }, 0);
  }

  function gj() {
    console.log(`${girlName}你好，我是郭靖，认识一下吧`);
  }
  hr(gj)

//=>我是黄蓉
//=>黄蓉你好，我是郭靖，认识一下吧