How to import images with jquery

jQuery is a popular JavaScript library that can help developers more conveniently manipulate the DOM, handle events, and perform animations. In front-end development, we often need to display images on the page, so when using jQuery, we also need to know how to import images.

Generally speaking, there are two ways to import images into web pages: using the tag and importing them as background images. The following describes how to use jQuery to import images in two cases.

1. Use the tag to import an image

Use the tag to easily import an image into a web page. In HTML, we usually use the following code to import images:

<img src="/static/imghwm/default1.png"  data-src="image.jpg"  class="lazy" alt="my image">

Here, the src attribute specifies the path to the image file, and the alt attribute specifies the alternative text that is displayed when the image cannot be loaded. If you want to use jQuery to dynamically import an image, you can use the following code:

$(document).ready(function(){
  $('body').append('<img src="/static/imghwm/default1.png"  data-src="image.jpg"  class="lazy" alt="my image">');
});

With this code, we can dynamically insert an image into the web page. It should be noted that when using jQuery to add images to a web page, you should ensure that the image is ready and accessible.

2. Import the image as a background image

Another way is to import the image as the background image of the element. In CSS, we usually use the following code to set the background image of an element:

div {
  background-image: url('image.jpg');
}

Different from the first way of importing images, this method requires specifying the background image attribute of the element in CSS, so when using When jQuery imports images, it also needs to operate CSS. The following is the code for using jQuery to import an image as a background image:

$(document).ready(function(){
  $('div').css('background-image', 'url(image.jpg)');
});

With this code, we can set an image as the background image of a specified element. It is important to note that when using this method, you should ensure that the image is ready and accessible.

Summary

The above are two methods of using jQuery to import images. It should be noted that when importing images, you should ensure that the images are ready and accessible, otherwise it may cause slow loading of the web page or loading errors. At the same time, when using CSS to set the background image of an element, you also need to ensure that the element has been loaded, otherwise the background image may not be displayed. To avoid these problems, you can use jQuery to operate on images after the page is fully loaded, or use a callback function to ensure that the background image is set after the element is loaded.

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