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OEvent.cancelBubble=true;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:Mind maps have images, branches and keywords, which can help us quickly sort out our thoughts and find key information. When we watch mind maps review again, we can quickly understand them.The factory class mode provides a mode to create a single class, while the builder mode is to centralize and manage various products to create composite objects. The so-called composite objects refer to a class with different attributes. In fact, the builder mode is obtained by combining the previous abstract factory mode with the final Test. Let's look at the code:那些步军们差点都跟不上了，全仗他们勇猛，所过之处无人敢靠近——靠近的都死了——才能得以跟随。神魔族的后裔，毕生以消灭嗜血族为职志，个性沉默寡言，青年的血气方刚与狂气热情皆隐盖在冷漠外表之下，欲语之言全寄藏在时而孤寂、时而澎湃的小提琴弦音之中；以一双银枪为武器，悠悠弦音，是给予嗜血族的悲怜镇魂曲。一部类似电影《第九区》（District 9）的外星人题材科幻剧（其实更像《E星恋》），故事创意来自一位西班牙制片人。数百名人形外星人困在地球上，为了防止出现意外，人类决定建立外星人定居点对他们进行集中看管（事实上是种族隔离、集中营）。10年之后，人类决定启动一项特殊的「高中教育项目」，尝试让9名外星少男少女去一所人类的郊区中学读书，看他们是否能融入人类社会。毫无疑问，双方的偏见和生物固有的「竞争意识」让整个计划变得更加复杂，而人类女孩Emery（Aimee Teegarden）和外星男孩Roman（Matt Lante）的恋情可能成为影响人类和外星人和平共存的关键——他们要么成为救世主，要么成为毁掉两个物种的罪人。