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What is the purpose of the controller in MVC? what is the difference between it and the model? I just learned the MVC framework. What I cannot understand is that the controller.

What is the purpose of the controller in MVC? what is the difference between it and the model? I just learned the MVC framework. What I cannot understand is that the controller.

Just like what is the difference between the following code {code...} and {code? Humbly ask the experts for advice, just like The following code Echo 'configuration error'; exit (3); // Status 3 indicates exit due to configuration error And // Exit directly ('configuration error '); What

In this article we will learn about the Python dictionary python copy functionThe relevant knowledge, python copyWhat it means is that what he does will be answered in the next article. Summary description The Python dictionary (Dictionary) copy () function returns a shallow copy of a dictionary. Grammar Copy () method syntax: Dict.copy () Parameters NA. return value Returns a shallow copy of a dictionary.

What is a project training course, what is the difference with professional courses, and who can study practical training courses? CSTP training products are designed according to the recruitment requirements of software enterprises for software engineers. Through investigat

interfaces that do not inherit or implement any other Java framework. Here is a quote from Martin Fowler personal website: "We wondered why people were so against using regular objects on their systems and concluded that it is because simple OB Jects lacked a fancy name. So we gave them one, and it's caught on very nicely. " --martin FowlerWe wondered why people did not like to use ordinary o

, call the iteration formula n = n/2.N = n/2Print "-"; N;ElseN = N * 3 + 1Print "-"; N;End ifLoopEnd Iteration Method Iteration Method is a common algorithm design method used to obtain the approximate root of equations or equations. Set the equation to f (x) = 0, use a mathematical method to export the equivalent form X = g (x), and then follow these steps: (1) Select the approximate root of an equation and assign it to variable x0; (2) Save th

CSS Introduction Method:1. Inline style (inline style/inline style): Written directly in HTML tagsFor example:2. Internal style: written between head and headFor example:3. External style: requires reference to take effectFor example:1>.2>[email protected] URL (.. /CSS/123.CSS)The difference between link and @import:Difference 1:Link is the XHTML tag, in addition to loading CSS, you can also define other tr

What is the difference between scanf and getchar? What is the use of getchar? scanfgetchar Let's look at the getchar () function again today and find that it is confused with the knowledge of the scanf function. Find the informati

vulnerability that existed in previous versions of FF was fixed, so FF could not complete the sneak through memory. And because the file operation FF does not provide support (it is not possible to complete data transfer across domains via cookies), this technique can only be used in IE.5, combined with the previous several ways, when visiting a site, the first request B website to complete data processing, and then according to the return of the log

valid operations in the execution of a program, with a clear execution sequence between the different operations, if an operation is time consuming or is stuck in a long wait (such as waiting for a network response), the program will not respond to actions such as a mouse and keyboard, This time-consuming thread can be assigned to a separate thread to execute, making the program more interactive.2) thread

architecture of the anemia model and the congestion model. Model of anemia model of congestive model of anemia the organization domain logic typically uses transactional scripting patterns, allowing each process to correspond to an action that the user may want to do, each driven by a process. That is, in the design of the business logic interface, each method corresponds to a user's operation, this mode has the following a few: It

a great impact on the visual effects, but also on the various devices to access the fluency and experience, has been more and more user recognition. Compared with the traditional website, the responsive website is a mainstream trend in recent years, the core of the responsive website is to provide users of different devices with a consistent browsing experience, not only improve the user experience, SEO op

What is a data warehouse, and what is the difference between a databaseDataWarehouseis a subject-oriented (Subject oriented), integrated (integrate), A relatively stable (non-volatile), data collection that reflects historical changes (timeVariant) to support management deci

Apple Watch has a total of three versions, including the basic Apple Watch, the sports Apple Watch sport (harder and firmer), and the luxury customization of Apple Watch Edition. In addition, Apple has made different designs for different user groups: it offers two different size options and six different strap designs. Because the 18K Gold Deluxe Edition is too expensive many people are difficult to appreciate, therefore everybody looks at the moveme

redundancy and is not conducive to maintenance.3. How to linkLinking refers to the use of HTML header tags to introduce external CSS files.Example:head> link rel="stylesheet" type="text/css" href="style.css">head>This is the most common and recommended way to introduce CSS. In this way, all CSS code exists only in a separate CSS file, so it has good maintainability. And all the CSS code exists only in

A process is a running activity of a program with certain independent functions about a data set.The difference between a process and a program:1, the program is an ordered set of instructions, is a static concept, its ability does not have any meaning of operation. The process is