How to convert jquery and js objects

JavaScript has always been considered the core technology of front-end development. In the development of Web pages, JavaScript is widely used. In these applications, there are a variety of libraries and frameworks. Using these tools can improve the efficiency and quality of our code writing. Among them, the jQuery library is one of the most popular. It provides many easy-to-use APIs and browser compatibility solutions, making it easier for us to develop high-quality web applications.

In jQuery applications, we often use the JavaScript object conversion function to achieve more flexible and efficient development. So, how is the conversion between jQuery and JavaScript objects implemented? Below, let’s explore how it works.

1. JavaScript Object

In JavaScript, an object is a composite data type that can have its own properties and methods. In web development, we often use JavaScript objects to represent elements on the page. For example, the following code:

var obj = {
    name: "Tom",
    age: 20,
    gender: "male",
    sayHello: function() {
        console.log("Hello!");
    }
};

This JavaScript object contains a string type attribute name, a numeric type attribute age, a string type attribute gender, and a function type attribute sayHello, which can Output the string "Hello!".

2. jQuery object

In jQuery, we often use selectors to obtain elements on the page. For example, get the jQuery object of a text box through the following code:

var $input = $("input[name='username']");

This code passes the selector "input[name='username']" to the $function, and the $function returns a jQuery object, which represents all input elements in the page whose name attribute is username.

The jQuery object is encapsulated by the jQuery library, which implements many convenient methods for operating elements, such as obtaining element attributes, setting element styles, adding event listeners, etc.

3. Convert JavaScript objects into jQuery objects

In web development, we usually need to convert JavaScript objects into jQuery objects in order to operate them using the API provided by the jQuery library. In jQuery, we can use the $ function to convert JavaScript objects into jQuery objects. For example:

var obj = document.getElementById("myDiv");
var $obj = $(obj);

This code converts the element with id myDiv in the page into a jQuery object $obj.

Similarly, we can also convert between JavaScript arrays and jQuery objects, for example:

var arr = [1, 2, 3, 4, 5];
var $arr = $(arr);

This code converts JavaScript arrays into jQuery objects $arr.

4. Convert jQuery objects into JavaScript objects

Similarly, we can also convert jQuery objects into JavaScript objects. In jQuery, we can use the get method or toArray method to convert the jQuery object into a JavaScript array, for example:

var $arr = $("input[name='password']");
var arr = $arr.get();

In this code, we will select the selector "input[name='password'] "The jQuery object $arr returned is converted into a JavaScript array arr through the get method.

It should be noted that the get method can only be used to convert a jQuery object containing one element into a JavaScript object. If you want to convert a jQuery object containing multiple elements into a JavaScript object, we need to use the toArray method. . For example:

var $inputs = $("input[type='text']");
var inputsArr = $inputs.toArray();

In this code, we convert the jQuery object $inputs returned by the selector "input[type='text']" into a JavaScript through the toArray method Array inputsArr.

5. Summary

In Web development, the conversion of JavaScript objects and jQuery objects is very common. Generally speaking, we can convert JavaScript objects into jQuery objects through the $ function, or convert jQuery objects into JavaScript objects through the get method or toArray method.

The conversion of JavaScript objects and jQuery objects can make our development more flexible and efficient, allowing us to use various tools and libraries more freely, making our development easier and more efficient.

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