What does jquery encapsulation mean?

With the continuous development and popularization of Web front-end technology, it is increasingly difficult for early JavaScript code to meet the needs of developers. In order to improve development efficiency and code maintainability, JavaScript has introduced many libraries and frameworks. Among them, jQuery is the most popular and widely used one.

So, what is jQuery encapsulation? Why do we need to encapsulate the code? This article will explain these issues in detail.

1. What is jQuery encapsulation?

In jQuery, encapsulation refers to encapsulating some JavaScript code in a function to achieve modularization and reuse of the code. In short, encapsulation is to encapsulate some commonly used code segments so that they can be called when needed.

jQuery encapsulation is achieved by writing a function called plug-in. Plugin functions accept one or more parameters and return a JavaScript object containing some functionality.

2. Why do we need jQuery encapsulation?

Encapsulated functions include:

(1) Increase code readability and maintainability.

Encapsulation can organize the code into a unit with specific functions, making the code easier to understand and maintain. In jQuery, encapsulation organizes a piece of code into a function or object and provides a public interface.

(2) Improve code reusability.

Encapsulation can integrate components into other code as functions or objects to improve code reusability. This can greatly reduce code redundancy, allowing developers to focus more on creating new functionality.

(3) Reduce code error rate.

In jQuery, encapsulation can reduce code error rates. Because encapsulated code can be unit tested, this makes it easier for developers to find and correct errors.

3. Basic principles of jQuery encapsulation

In order to achieve efficient reuse and modularization of code, jQuery encapsulation needs to follow the following basic principles:

(1) Namespace

In jQuery, namespace is very important. Namespaces can group functions or objects to make code more readable. Namespaces also prevent code conflicts.

(2) Code readability

In jQuery, encapsulation needs to follow the principle of concise and readable code. If a function or object is difficult to understand, it should be renamed or the code structure should be changed.

(3) Reference dependencies

Encapsulation in jQuery usually requires the support of one or more functional libraries. You must take these dependencies into account when writing your own functions or objects.

(4) Public interface

Encapsulation also needs to provide public interfaces so that other code can call these interfaces. These interfaces should be as simple and easy to use as possible.

4. jQuery encapsulation example

The following is a basic jQuery encapsulation example, which modifies the $() function into a new function myjQuery().

(function(window, undefined){

    var jQuery = function(selector, context){
        return new jQuery.fn.init(selector, context);
    };

    jQuery.fn = jQuery.prototype = {

        init: function(selector, context){
            // your code
        },

        // your functions

    };

    jQuery.fn.init.prototype = jQuery.fn;

    window.myjQuery = jQuery;

})(window);

In the above example, the myjQuery() function is defined, which accepts two parameters: selector and context. A new jQuery object is allocated, returned by the initialization function init(). In this example, the init() function is defined in the jQuery.prototype object, which also contains several other functions.

Summary:

So, jQuery encapsulation refers to encapsulating some commonly used JavaScript code segments so that they can be called when needed. Encapsulation can improve the readability, maintainability and reusability of code, while reducing the code error rate. Implementing jQuery encapsulation requires following basic principles such as namespace, code readability, reference dependencies, and public interfaces.

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