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谁要打你？？谁打你我杀他全家。HB. Install yum-utils, which provides yum-config-manager, which can be used to manage yum source (the system can not execute it if it comes with it)江市刑警队特侦组组长童帆通过进修犯罪现场勘查、犯罪心理高级课程，希望为刑侦工作开拓出新的境界，走出一条科技强警科学刑侦的新路，同时还建议引进心理辅导机制，对长期处于高压工作环境、面对穷凶极恶犯罪分子的干警进行心理干预。此时，江市发生了一系列恶性案件，特侦组全面进入侦查，却发现隐藏在凶案背后的一个危害社会安全的大阴谋。在一次次深入案件的调查中，童帆忍受着常人难以承受的压力，带领特侦组成员通过对犯罪心理和犯罪现场的完美还原等科学技术手段，与时俱进办案，拨开重重迷雾，历经艰难险阻，最终将犯罪分子一网打尽。特侦组最终保护了人民群众和国家财产安全。在众人眼中尹将军似乎些不一样，让人捉摸不透。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: