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Although the above code fulfills the requirements on the page, But our code is coupled together, At present, although there are not many problems, if SKU attributes become more and more with the change of demand in the future, for example, when one or more drop-down boxes are added to the page, it means selecting the memory of the mobile phone. Now we need to calculate the color, memory and purchase quantity to judge whether NextBTN shows insufficient inventory or puts it into the shopping cart. The code is as follows:Public class ExampleFounder of Touching Socks汪魁立即拍着胸脯说道：那是，那是。让陈启不由多看了几眼。Many people say that required JS is an asynchronous loading module, SeaJS is a synchronous load module, This understanding is actually inaccurate, In fact, the loading modules are asynchronous, However, AMD relies on the front, JS can easily know who the dependent modules are and load them immediately, while CMD relies on them nearby. It needs to change the modules into strings to parse them before knowing which modules it depends on. This is also a point that many people criticize CMD. Sacrificing performance brings convenience to development. In fact, the time taken to parse modules is so short that it can be ignored.在以农业生产为主的古代社会里，肥沃的土地和便利的水源无疑就是财富的象征，故而关中之地是绝对意义上的天府之国。