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Finally, a Light.prototype.setState method is provided, through which the state object can switch the state of the light object. The switching rules of states are well defined in each state class in advance. No more conditional branch statements related to state switching can be found in Context:-w944史班头先前一直不动声色，这时侧头对身边一个差役说了几句话，那差役便叫了几个人挤出人群。Three, the use of star endorsements to pay attention to its periodicity, identityIn this section, we will learn about the event module. Event module is mainly used to detect some event operations from other modules. It is generally used as the basis for starting programs and is also a relatively simple module. There are also fewer building blocks. We will introduce them one by one through the following diagrams:历史长河，绵远流长。谜团悬案、奇人轶事，一组历史画卷徐徐展开。《晓说》2020精编版《晓说·历史篇》由优酷全娱乐制作，聊四海说古今，带你体验历史背后的精彩。不健康的情感关系，严重的家庭冲突，致命的丑闻。一对好友为了证明自己的清白而展开逃亡，而每个转弯处都藏着危险。