[1.授权验证](1.%E6%8E%88%E6%9D%83%E9%AA%8C%E8%AF%81.md) [2.更新检测](2.%E6%9B%B4%E6%96%B0%E6%A3%80%E6%B5%8B.md) [3.更新包的结构](3.%E6%9B%B4%E6%96%B0%E5%8C%85%E7%9A%84%E7%BB%93%E6%9E%84.md) [4.注意事项](4.%E6%B3%A8%E6%84%8F%E4%BA%8B%E9%A1%B9.md)