正在跳转至 https://github.com/deepfunc/js-bullshit-blog/blob/master/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/%E6%B8%90%E8%BF%9B%E5%BC%8F%E5%AE%9E%E7%8E%B0Promise/src/p4.js