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Explain the template method mode, which means: in an abstract class, there is a main method, and then define 1... n methods, which can be abstract or actual methods, define a class, inherit the abstract class, override the abstract method, and realize the call to subclasses by calling the abstract class. First look at a diagram:First of all, let's introduce the business: in the purchase process, you can select the color of the mobile phone and enter the purchase quantity. At the same time, there are two display areas in the page, which respectively display the color and quantity that the user has just selected. There is also a button that dynamically displays the next operation. We need to query the inventory corresponding to the mobile phone of this color. If the inventory quantity is less than the purchase quantity this time, the button will be disabled and the copy with insufficient inventory will be displayed. Otherwise, the button will be highlighted and can be clicked and displayed if the shopping cart is displayed.Method of competition:立志成为作家的土肥圆贝小贝（岳云鹏 饰），因外貌原因在现实屡屡碰壁，后在不经意间找到尘封已久的家谱，意外穿越至各个年代，与祖先爆笑相遇，亲自调配自己的基因。普通大学生林海更新微信后，被拉入天庭交易群，这是什么奇怪的微信群？里面有孙悟空猪八戒，还有嫦娥和玉皇大帝？不会都是骗子吧？但是林海想不到的是，他们居然可以交易各种神丹妙药，让原本平凡低调的林海，摇身一变成为了实力高强的救世主！从此他的人生变得多姿多彩，正义善良的他也为城市的安宁献出自己的力量！ABC正式宣布续订《灵书妙探》第八季。徐文长迫不及待四望，发现了另一个看热闹的人，就是你了，凤海是吧，领个路。