From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:史书上记我杨长帆一个大反贼，提前砍上朱家一刀，早亡早了。辽邦白天佐领兵进犯宋朝边境，将镇守在洪州城的杨延昭和十路总兵团团围住。杨宗保星夜出城，单骑突围，回转京城搬求援兵，怎奈朝中诸将俱难担当解围的重任，无人适于挂帅出征。宋王只得命八贤王赵德芳和天官寇准到天波杨府来调将，佘太君表示了一番为国为家、救国救民的赤胆忠心，但又谓杨府已无将可调。敦厚的八贤王不知如何是好，熟谙杨家的老寇准已看出其中必有原因。因而将老太君诓入后堂去为他们准备宴席，自己就拉着八贤王溜人后花园演武厅。只见园中刀枪剑戟列成林，马蹄印乱纷纷，都是新踏的印。二人又击打催金鼓，敲响鸣金锣，三通鼓响，果然见杨家男女兵将突然齐集“聚将台”前，更见穆桂英全身铠甲披挂定，威风凛凛进入演武厅，二人大喜。忽听老太君下令收兵，寇准赶忙借千岁之名传令少夫人到前厅议事。二人将洪州被困之事对她说明，她激愤不已，极欲挺身而出，可是顷刻之间却又犹豫起来，吞吞吐吐也说不出.《美女的诞生》讲述的是通过整容与减肥来转变人生的女人和使她诞生的男人之间的浪漫爱情故事。韩泰熙是财阀SJ集团的得力继承者，因为心里受到冲击后患上“心碎综合症”，他的性格犹如活火山般难以预测，是一个水火不兼容的角色，为了寻找回自己心爱的女人，他将肥胖女人沙金兰改造成了漂亮无比的莎拉，接着在与这个由自己改造的女人相处过程中，逐渐爱上了她，随之二人将展开一段左冲右突的浪漫爱情。One last thing on this subject, The 7.62 mm traced armour-piercing firebombs fired by the 81-1 family, Although the name is a little long, But compared with ordinary munitions, The difference is still well understood: Tracing and burning are simple, Is to add two corresponding drugs, The armor piercing is to replace the steel core behind the bullet's brass back armor (also known as bullet head) with a harder tungsten alloy core with stronger penetration to hard targets. The latter is also the tail-stabilized shelling penetrator used on the third generation of modern main battle tanks (abbreviation: APFSDS) is one of the two main materials (the other is the notorious, highly radioactive depleted uranium penetrator core, The user country is mainly the United States, while China mainly uses tungsten alloy penetrators, Less pollution and better performance, The United States does not need to. First, the United States does not pass the standard of tungsten treatment technology. Far from the level of our country, Secondly, the United States is a tungsten-poor country. It also wants to fully use tungsten alloy bombs, But it can't be used, But as a nuclear Power, There is a lot of depleted uranium as nuclear waste, so depleted uranium is selected as a substitute. As for tungsten alloy and depleted uranium, after putting aside the key additional condition of radioactive pollution, the pure question of who is better in armour-piercing performance is not directly related to this article, so it will not be described in detail).Disadvantages: The efficiency is a bit low, and the synchronization lock must be judged every time the instance is called.离家出走的四个少年通过倒卖偷来的东西“养家糊口”。当他们靠偷东西过活的日子越来越不好过的时候，为了在这个没有大人能保护他们的残酷社会中生存下去，四个年轻人不惜做出更危险的行动、犯更大的罪行。 一天，他们偷了一个男人的车，而这个男人是经营一间非法KTV的老板。 四个年轻人被抓住后，其中的一个女孩被逼迫到KTV工作，直到还清钱才放她走。 更糟的是，四个年轻人中有两个人选择放弃。 那一刻起，拯救女孩成了男主角一个人的战斗......
