How to delete HTML images

HTML Image Deletion: Exploring the Methods and Applications of Image Deletion

HTML (Hypertext Markup Language, Hypertext Markup Language) has become the foundation of the modern Internet. Its original use was for the creation and layout of hypertext documents. However, with the development of the Internet, HTML is also widely used to display multimedia content such as images and videos. The most common one is pictures. However, in practical applications, we may need to delete some images. So, how to delete HTML images? This article will discuss this and introduce some methods of deleting pictures that may be used in practical applications.

1. The basic concept of HTML pictures

In HTML, pictures are usually introduced through the img tag, and its basic format is:

<img src="图片地址" alt="图片描述">

Among them, the src attribute represents the image The path can be a local path or a remote path on the website; the alt attribute is a text description of the image to facilitate users who cannot view the image to understand the content.

If we need to delete a certain picture, we need to find the location of the picture and then delete the img tag where it is located. Below we will introduce several image deletion methods for different situations.

2. Delete the img tag directly

The easiest way is to directly delete the img tag containing the image. For example, the following code:

<div>
  <img src="http://example.com/image.png" alt="一只猫咪">
  <p>这是一只可爱的猫咪</p>
</div>

If you need to delete an image, just delete the img tag:

<div>
  <p>这是一只可爱的猫咪</p>
</div>

This method is suitable for situations where there is only one image, but if you need to delete multiple Pictures require other methods.

3. Hiding images through CSS

In addition to the img tag, we can also hide images through CSS. The specific method is to set the display attribute of the corresponding selector to none in CSS. For example, the following code:

<div>
  <img class="cat" src="http://example.com/cat.png" alt="一只猫咪">
  <img class="dog" src="http://example.com/dog.png" alt="一只狗">
  <p>这是一只可爱的猫咪和一只狗</p>
</div>

<style>
.cat {
  display: none;
}
</style>

In this way, pictures with class cat can be hidden. It's important to note that this method doesn't actually delete the image, it just hides it. Therefore, if you need to completely delete the image, you should use other methods.

4. Deleting images through JavaScript

JavaScript can directly modify the content in the HTML document, so the deletion of images can be achieved through JavaScript. The specific method is to obtain the tag of the image through getElementById and other methods, and then call the removeChild method to delete the tag. For example, the following code:

<div id="animals">
  <img id="cat" src="http://example.com/cat.png" alt="一只猫咪">
  <img id="dog" src="http://example.com/dog.png" alt="一只狗">
  <p>这是一只可爱的猫咪和一只狗</p>
</div>

<script>
var cat = document.getElementById("cat");
var animals = document.getElementById("animals");
animals.removeChild(cat);
</script>

This code uses JavaScript's getElementById method to obtain the tags with IDs cat and animals, and then calls the removeChild method of the animals tag to delete the cat tag. If you need to delete multiple pictures, you need to call the removeChild method multiple times.

It should be noted that although JavaScript can delete images, for some images that have been cached by the browser, modifying the HTML document cannot delete them from the disk. At this time, we can use some other methods.

5. Delete pictures through the server

If we need to delete some cached pictures, then we need to delete these pictures directly from the server. This method needs to be executed on the server, so it requires certain server management capabilities. The specific method is to find the corresponding image files on the server and then delete them. If the image is referenced through a URL, you need to find the corresponding URL and delete it on the server.

It should be noted that although this method can delete pictures, it requires certain server management capabilities. At the same time, if the website has a high number of visits, some unexpected problems may occur.

6. Summary

In practical applications, for some unnecessary pictures, we may need to delete them. This article starts from the basic concept of img tag and introduces several common image deletion methods. If we only need to delete a few pictures, we can delete the corresponding img tag directly from the HTML document; if we need to delete multiple pictures, we can hide them through CSS; if we need to completely delete the pictures, we can do it through JavaScript; if necessary Deleting cached images can be done through the server. In different situations, we can flexibly choose the appropriate method.

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