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How to replace tags using jQuery statements
- PHPzOriginal
- 2023-04-17 15:05:22491browse
With the development of Internet technology, web development has become an increasingly popular skill. Among them, front-end development plays a vital role as the core of the entire web development. In front-end development, jQuery is widely used in web design and interaction. Its powerful functions and ease of use greatly improve the efficiency of web development and are more in line with user experience requirements.
This article will introduce how to use jQuery statements to replace tags to achieve the effect of web development.
- Call of jQuery statements
Before using jQuery statements to replace tags, you must first call the jQuery library. It should be noted that the jQuery library must be loaded before all other JavaScript files, so as to ensure that all functions of jQuery have an impact on the entire web page.
The jQuery library can be called in the following two ways:
Method 1:
Use a text link to call the jQuery library. You can add the following code to the head of the HTML document. :
<head> <script type="text/javascript" src="https://cdn.jsdelivr.net/jquery/1.7.2/jquery.min.js"></script> </head>
Method 2:
Using the local calling method, you can add the following code in the HTML document:
<head> <script type="text/javascript" src="jquery.min.js"></script> </head>
Among them, jquery.min.js is the name of the jQuery library file you downloaded.
After the jQuery library is loaded successfully, add the jQuery statement in the script to start the replacement operation.
- jQuery statement replacement tag
The following is an example of using jQuery statement replacement tag:
<div id="text">在这里放置要被替换的文字</div>
<script>
$(document).ready(function(){
$('#text').text('被替换的文字');
});
</script>
In the above example code, $ (document).ready is a jQuery shortcut method that executes the specified function after the DOM is ready. $('#text') means selecting the tag <div> with id text for replacement operation. text represents the text that replaces this tag, enclosed in double quotes. In actual applications, text can be replaced with the text information you need.
In addition, there are other jQuery statements that can complete different replacement functions:
- html(): replace html tags;
- val(): replace form The value of the element;
- attr(): Replace the attribute value of the HTML element, such as src, href, etc.
<div id="img-wrapper">
<img src="old.jpg" alt="旧图片">
</div>
<script>
$(document).ready(function(){
$('#img-wrapper img').attr('src', 'new.jpg');
$('#img-wrapper img').attr('alt', '新图片');
});
</script>
This example can replace the src and alt attributes of the specified element. Among them, img represents the selected HTML element, src and alt are the replaced attribute names, and new.jpg and New picture is the replaced value.
In short, using jQuery statements to replace tags is very simple, you only need to master and use the relevant statements. Using jQuery statements can quickly and efficiently modify web page content, greatly improving the efficiency of web page development.
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