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The fourth step is to be responsible for the implementation of specific button events. After clicking the button, Context does not do any specific operations, but delegates the request to the current status class for execution:三次弃他？小葱慢慢地回忆起和李敬文错身而过的几次经历，每次都是因为跟泥鳅不成，然后她觉得不该再找他，以为那样把他当做退一步的选择，是看轻了他。一九三五年前后，日本帝国主义加强了对我国的侵略。在民族危机空前严重的关头，蒋介石仍旧坚持“攘外必先安内”政策，张学良将军被迫“剿共”，因在陕北战场上屡遭失败，受到蒋介石的责难，于是急于寻求出路。张学良通过被我军放回的原东北军团长高福源的关系，与我党周恩来同志在延安举行了会谈。张将军决定以民族存亡的大局来说服蒋介石停止内战，一致抗日。与此同时，杨虎城收到了毛主席派人给他送来的亲笔信。一九三六年十二月初，蒋介石亲临西安，下榻于临潼华清池，张学良多次对蒋“苦谏”，均痛遭拒绝。张、杨被迫于一九三六年十二月十二日对蒋实行了“兵谏”，爆发了震惊中外的“西安事变”。“西安事变”和平解决，抗日战争也进入了崭新阶段。MH-H10For example, some common outsourcing companies receive a project, Then the received project may be the person in charge of the project or the manager level of the company. After receiving the project, the manager does not develop it himself. Leave it directly to the project manager for development, The project manager is certainly not willing to develop it himself. Oh, It will hand over the project to the following code farmers to do, So the coder handles it, If the code farmers don't handle it, Then the project may be directly suspended, but after the final completion, the outsourcing company does not know who developed that part of these projects. It does not know or care about it. What it cares about is that the project has been handed over to the outsourcing company and has been developed without any bugs. Therefore, the advantages of the responsibility chain mode lie here:这座宫殿是自打景驹、秦嘉时代便开始兴建，初具规模。