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As seen above, we directly call that subclass baiDuInterview.init () method. Since our subclass baiDuInterview has no init method, but it inherit the parent class, we will look for the corresponding init method in the parent class. Therefore, it will face the prototype chain and look up in the parent class. The same is true for other subclasses, such as Ali class code, which will not be introduced much here. For the parent class, this method Interview.prototype.init () is a template method, because it encapsulates the algorithm framework in the subclass. As a template for an algorithm, it guides the subclass to execute the code in what order.再立一位秦王，也可平息六国的不满。《长牙》由安·玛丽·佩斯执导。啊？范依兰不由的一声惊呼。Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.