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更新时间(jian):2024-04-20 17:49:19 作者:大河网
The above is just a synchronous chain of responsibilities, We let each node function return a specific value "nextSuccessor" synchronously, To indicate whether to pass the request to the next node, we will often encounter AJAX asynchronous requests in our development. After the request is successful, we need to do something so-and-so. At this time, if we apply the above synchronous request again, it will not take effect. Let's understand and use asynchronous responsibility chain to solve this problem. We add another prototype method Chain.prototype.next to the Chain class to manually pass the request to the next node in the responsibility chain. The structure using monomer mode is as follows demo (1) General Factory Mode 4. How do I unsubscribe? 4. Such notifications //etc. Notifications
The test classes are as follows: Finally, change the switching rules between state classes from StrongLightState---> OffLightState to StrongLightState---> SuperStrongLightState---> OffLightState:
? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages: The enhanced module pattern is used when it is suitable for those situations where the single column must be an instance of some type and some attributes or methods must be added to enhance it. For example, the following code:
Console.log ("I finally saw Baidu's pen test questions"); The above code is code implemented without proxy mode; Console.log ("I finally saw Baidu's pen test questions"); This.leader (); I don't know if you have ever played the game of hero killing. In the earliest days, heroes killed 2 people (enemies and themselves respectively). For this game, we first use ordinary functions to implement the following: //Subclasses override methods to implement their own business logic Advantages: Solves the problem of thread insecurity. As above, the code uses the policy pattern to refactor the code. It can be seen that the code responsibilities are updated clearly and the code becomes clearer. 1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon. 3. HR and Director or General Manager Interview; Then in this round, HR may ask you some basic personal information and other information, and ask you what personal plans you have in the future. The director or general manager may ask if you have any knowledge of their websites and products. And what are the problems with their products now, whether there are any better suggestions or how to improve them, etc. Then add a superStrongLightState object to the Light constructor:
Next, define the Light.prototype.init method, which is responsible for creating a real button node in the page. Assuming that this button is the switch button of the light, when the onclick event of the button is triggered, that is, when the light switch is pressed, the code is as follows: The reusability of the algorithm is poor. If there are similar algorithms in other places, but the rules are different, our codes cannot be used universally.
In the scanning state, the file cannot be operated, neither can it be paused nor deleted, but can only wait for the scanning to complete. After the scan is completed, judging from the MD5 value of the file, if it is confirmed that the file already exists in the server, it directly jumps to the upload completion state. If the size of the file exceeds the maximum allowed upload, or the file is corrupted, the upload failure state is skipped. Only in the rest of the case will it enter the upload state. During the upload process, you can click the Pause button to pause the upload. After pause, clicking the same button will continue the upload. In the process of scanning and uploading, clicking the Delete button is invalid. Only after pausing, uploading is completed and uploading fails can the file be deleted.
State mode and policy mode are like twins. They both encapsulate a series of algorithms or behaviors. Their class diagrams look almost identical, but their intentions are very different, so they are two very different modes. The policy pattern and the state pattern have in common that they both have a context, policies or state classes to which the context delegates the request to execute Five: Understanding the Responsibility Chain Model
The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place. In the third step, the Upload.prototype.init method does not need to be changed, but is still responsible for creating DOM nodes related to the follow-up process into the page and starting the event of binding buttons: The code for creating iframe and div for the following tests is as follows: Let's define another initEvent function, which makes all ordinary objects have the function of publishing and subscribing, as follows: 400部国产自拍视频 1. An instance object in the application needs to be accessed frequently. Console.log ("I am the technical director responsible for the technical interview"); We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible. Users can safely request proxies. They only care about whether they can get the desired results. If we don't need a proxy object, we can directly change it into an ontology object to call the method. 4. Finally, HR talks with you about salary and can get notice and offer within a few working days (of course, there must be no notice for those who do not meet the requirements); And whether they need to know the company's situation and other information; Eliminate the coupling between the sender of the request (the company that needs to outsource the project) and the receiver (the outsourcing company).
Then execute return this.success & & this.successor.passRequest.apply (this.success, arguments); This function goes to FN2, prints 2, and then there is a setTimeout timer asynchronous function, which needs to request to the next node in the responsibility chain, so 3 will be printed after one second. Imagine a scene where there is an electric lamp with only one switch on it. When the light is on, press the switch at this time and the light will switch to the off state. Press the switch again and the light will be turned on again. The behavior of the same switch button is different in different states.
The following demo is what I saw in the book, but it doesn't matter. We just understand the use of the strategy model. We can use the strategy model to calculate the bonus. The second scenario uses the proxy pattern, Among them, the myImage function is only responsible for doing one thing, creating IMG elements and adding them to the page. The loading picture is given to the proxy function ProxyImage to do. When the picture is loaded successfully, the proxy function ProxyImage will notify and execute the method of the myImage function. At the same time, when the proxy object is not needed in the future, we can directly call the method of the ontology object. The specific implementation is as follows: The following demo is what I saw in the book, but it doesn't matter. We just understand the use of the strategy model. We can use the strategy model to calculate the bonus. 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. Disadvantages: There are a little more node objects in the responsibility chain mode. It is possible that most nodes do not play a substantial role in a certain request process. Their role is only to make 2. How to realize the publish-subscribe mode? Understanding of virtual agent merging http requests: //Code Initialization