A closer look at the two main types of the jQuery library

jQuery library is a popular and powerful JavaScript library that is widely used in web development. It simplifies common tasks such as DOM manipulation, event handling, animation effects, etc., allowing developers to write code more efficiently. Before we dive into the two main types of jQuery libraries, let’s first understand the basic structure and usage of jQuery libraries.

First of all, the jQuery library consists of two main types: selectors and methods. Selectors are tools used to locate and select HTML elements, while methods are functions to operate and process these elements. The following will introduce how to use these two types respectively, and provide specific code examples.

1. Selector

Selector is an important and commonly used type in the jQuery library. It can quickly locate HTML elements through concise syntax. In jQuery, a selector starts with a $ symbol, followed by a string, such as "$('selector')". The following are some commonly used selectors:

1. ID selector

   $('#myElement').css('color', 'red');

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   The above code will select the element with the id "myElement" and set its text color to red.

2. Class Selector

   $('.myClass').hide();

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   The above code will select all elements with the class name "myClass" and hide them.

3. Element Selector

   $('p').fadeIn();

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   The above code will select all paragraph elements and fade them out.

2. Methods

Methods are another main type in the jQuery library, which are used to operate and process selected HTML elements. jQuery provides a wealth of methods to complete various tasks, such as operating styles, binding events, adding animation effects, etc. The following are examples of some commonly used methods:

1. Operation Style

   $('#myElement').css('font-size', '20px');

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   The above code will select the element with the id "myElement" and set its font size to 20px.

2. Binding events

   $('#myButton').click(function(){ alert('按钮被点击了！'); });

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   The above code will select the button element with the id "myButton" and bind the click event. When the button is clicked, a prompt box will pop up.

3. Add animation effect

   $('#myImage').fadeIn(1000);

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   The above code will select the picture element with the id "myImage" and fade it in for 1 second.

To sum up, the selectors and methods of the jQuery library are functions that developers often use in actual projects. By flexibly using selectors to locate HTML elements and combining various methods to implement corresponding operations, developers can develop web applications more efficiently. I hope the above code examples can help readers understand and apply the jQuery library more deeply and improve their front-end development skills.

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