jquery setting content is not covered

jQuery is a widely used JavaScript library that makes JavaScript programming easier and more convenient. In jQuery, we often need to replace the content of an element, but sometimes we don't want it to completely cover the original content. Instead, we need to add new content after the original content, or insert some content in front of the original content. New content. This article will share how to use jQuery to avoid overwriting old content.

First, use the .html() method to replace the HTML content. This method will overwrite the HTML of the entire element. If you only need to replace part of the content, you can use the .replaceWith() method provided by jQuery.

For example, we have the following HTML code:

<code class="html"><div id="sampleDiv">这是一个例子。</div></code>

Now we need to replace "example" with "example":

<code class="javascript">$('#sampleDiv').html($('#sampleDiv').html().replace('例子', '示例'));</code>

This method will cover the entire div content, If the original content is relatively complex, this method will appear cumbersome and inflexible, and will need to be modified according to the specific situation.

In fact, we can use the append() and prepend() methods to achieve operations that do not overwrite the original style.

The append() method inserts the specified content to the end of the matching element, while the prepend() method inserts the specified content to the front of the matching element. Neither method will overwrite the original content.

So, if we want to add "(parameter)" after the example text, what should we do?

<code class="javascript">$('#sampleDiv').append('（参数）');</code>

This method will add "(parameter)" to the end of the example text. Similarly, if we want to add "Note:" before the example text, how should we do it?

<code class="javascript">$('#sampleDiv').prepend('注意：');</code>

This method will add "Note:" before the sample text. These two methods are very simple to use and will not overwrite the original style, making them very convenient and practical.

In addition, if we want to insert content into multiple elements, we can use the each() method, as shown below:

<code class="javascript">$('.sampleParagraph').each(function() {
  $(this).append('！')
});</code>

This method will be added after all elements whose style class is sampleParagraph An exclamation point. If we want to add "Note:" in front of all elements, we should write like this:

<code class="javascript">$('.sampleParagraph').each(function() {
  $(this).prepend('注：')
});</code>

This method will add "Note:" in front of all elements.

In general, by using the append() and prepend() methods, we can insert content before and after the element without overwriting the original content. Using the each() method, you can operate on multiple elements. These methods are very flexible and simple to use, and are very suitable for front-end developers to use when implementing content replacement.

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