How to cut pictures with jquery
In front-end development, cutting pictures is a very important link. The process of cutting is to cut the design drawing into HTML, CSS and JS codes through cutting tools. In the process of cutting pictures, jQuery is a very practical tool. In this article, we will talk about how jQuery cuts images.
The first step is to prepare the design drawing
Before using jQuery to cut the picture, you first need to prepare the design drawing. Design drawings are generally produced by designers using tools such as Photoshop or Sketch. The design drawing contains all elements and styles of the page, including background, text, buttons, pictures, etc. After preparing the design drawing, we can officially start using jQuery to cut the drawing.
The second step is to introduce the jQuery library file
Before using jQuery to cut images, you need to introduce the jQuery library file into the HTML page. The jQuery library file can be introduced into the HTML page through the following code:
<head> <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script> </head>
In this code, we introduce the jQuery library file in the <head> tag so that we can Use jQuery in the page.
The third step, cutting pictures
After the preparation work is completed, we can officially start using jQuery to cut pictures. There are many ways to use jQuery to cut images. Below we will talk about three commonly used methods.
- Selector
Using jQuery’s selector can easily obtain elements on the page. You can get a div element through the following code selector:
$('div'); This selector will get all div elements. After obtaining the element, we can perform styling and other operations on this element.
- Chain operation
When using jQuery to cut images, you usually need to write multiple codes because you need to perform multiple operations on the same element, resulting in a large amount of code. Increase. Using jQuery's chain operation can merge multiple operations together to make the code more concise.
$('div')
.css('background-color', 'red')
.height(100)
.width(100);In this example, we used chain operations to perform three operations on a div element, namely setting the style to set the background color to red, setting the height to 100px, and setting the width to 100px.
- Events
jQuery can add a variety of events to elements on the page. You can add a click event to a button through the following code:
$('button').click(function(){
alert("Hello jQuery!");
})In this code, we obtain a button on the page through the selector, and then add a click event to this button. When this button is clicked , a prompt box will pop up showing "Hello jQuery!".
Summary:
Using jQuery to cut images can make our development more efficient and the code more concise. In the process of cutting pictures, we need to pay attention to the design of the page and master jQuery. Through the above introduction, I believe everyone can already have a preliminary understanding of jQuery and quickly get started with cutting pictures.
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