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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:Http://m.jiemian.com/article/2028492.html从小到大，简（吉娜·罗德里格兹 Gina Rodriguez 饰）都被奶奶阿尔巴（伊凡·科尔 Ivonne Coll 饰）如此教育着：一是肥皂剧才是包含了人生全部智慧的圣经，二是女孩要不惜一切代价保卫自己的贞洁。所以，尽管已经有了交往已久的未婚夫麦克（布雷特·戴尔 Brett Dier 饰），但简依然守身如玉。 　　让简没有想到的是，自己竟然怀孕了！原来，在误打误撞之中，简接受了人工授精手术，而这枚精子的主人，竟然是简的老板拉斐尔（贾斯汀·贝尔杜尼 Justin Baldoni 饰），更糟糕的是，简的母亲坚定的认为，自己的女儿是圣母转世。腹中孩子的去留成为了简目前需要面临的最大问题，她会做出怎样的选择呢？我为官几十年，还从未见过你这样的巡抚。二来此时田野风光正好，在田上酒家或是镜湖边聚会谈讲，倒比在山上看书更得益。　　在阿华的鼓励下，姐妹俩参加了“新星选秀”大赛，姐姐失声落选，阿梅因表现出众从此踏入星途。星途发展上并不顺畅的她与初露星相的何耀文相识，二人性格各异，却暗有默契，互相鼓励、互相扶持，终结下一生不背叛的坚贞友谊。 　　5. Find customers through your competitors