In front-end development, we often encounter the need to change the content of original page elements through JavaScript. Among them, changing the content of the a tag is also a very common requirement. In this article, we will introduce how to change the content of a tag through jQuery.
- Select the a tag that needs to be changed through the class selector
In the page, if we want to modify the content of the a tag through jQuery, we first need to find the one that needs to be modified. a tag. There may be multiple ways to find this a tag, such as selecting it by tag name, id or other attributes. But here, we will use the class selector to select the a tag whose content needs to be modified. The sample code is as follows:
<html>
<head>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(function() {
$('.modify').text('修改后的内容');
});
</script>
</head>
<body>
<a href="#" class="modify">需要修改的内容</a>
</body>
</html>In the above code, we added a class name "modify" to the a tag. Through this class selector, we found the a tag we want to modify the content, and passed text( ) method changes the text within it. It should be noted that when executing jQuery code, we need to ensure that the page has been loaded. Here we use $(function(){}) to ensure that.
- Select the a tag that needs to be changed through the id selector
In addition to selecting the a tag that needs to be changed through the class selector, another common way is through the id selector to select. The sample code is as follows:
<html>
<head>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(function() {
$('#modify').text('修改后的内容');
});
</script>
</head>
<body>
<a href="#" id="modify">需要修改的内容</a>
</body>
</html>In the above code, we added an id "modify" to the a tag. Through this id selector, we found the a tag whose content needs to be changed, and changed it through the text() method. text in it.
- Add HTML elements as the content of the a tag
In addition to changing the text in the a tag, we can also change the content of the a tag by adding HTML elements. content. In the following example, we will create a new span element and then add it to the a tag. The sample code is as follows:
<html>
<head>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(function() {
$('.modify').html('<span style="color: red;">修改后的内容</span>');
});
</script>
</head>
<body>
<a href="#" class="modify">需要修改的内容</a>
</body>
</html>In the above code, we use the html() method to change the content in the a tag. Among them, a new span element is created through the HTML tag, and its style is set to red, and then used as the content in the a tag.
Summary
Through the above three methods, we can use jQuery to change the content of the a tag very conveniently. It should be noted that in actual development, we need to choose the most appropriate method based on specific needs and scenarios. At the same time, before modifying the content of the a tag, we should also ensure that the page has been loaded to avoid the problem of elements not being found.
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