jquery adds to elements

It is very convenient and efficient to use jQuery to add, delete, modify and check elements. It can provide us with numerous API functions to help us easily implement dynamic HTML pages.

1. How to add elements in Jquery:

1. append(): Add a new element to the end of the child element of the specified element.
2. prepend(): Adds a new element to the head of the child element of the specified element.
3. after(): Insert a new element after the specified element.
4. before(): Insert a new element before the specified element.

2. How to delete elements in Jquery:

1. remove(): Delete the specified element and all its child nodes.
2. empty(): Empty all child nodes of the specified element (but retain the element itself).

3. Methods to modify elements in Jquery:

1. text(): Set or get the text content of the specified element.
2. html(): Set or get the HTML content of the specified element.
3. attr(): Set or get the attribute value of the specified element.
4. val(): Set or get the value of the form element.

4. How to query elements in Jquery:

1. find(): Find child elements according to the selector.
2. parent(): Find the parent element of the specified element.
3. siblings(): Find all sibling elements of the specified element.
4. eq(): Returns the element at the specified index position.

The above are the commonly used methods of adding, deleting, modifying and checking elements in Jquery. Let’s look at some practical examples below.

For example, we have an HTML code snippet:

<div id="myDiv">
  <p>这是一个段落。</p>
  <ul>
    <li>列表项1</li>
    <li>列表项2</li>
    <li>列表项3</li>
  </ul>
</div>

Now we can use Jquery to operate on this code snippet.

1. Use the append() method to add a new element:

$('#myDiv ul').append('<li>列表项4</li>');
//将新的列表项添加到myDiv下的ul元素中

2. Use the after() method to add a new element after the specified element:

$('#myDiv ul li:first-child').after('<li>列表项0</li>');
//将新的列表项添加到myDiv下的ul元素中，插在第一个列表项之前

3. Use remove () method deletes the specified element and all its child nodes:

$('#myDiv ul li:last-child').remove();
//删除myDiv下的ul元素的最后一个列表项

4. Use the text() method to modify the text content of the specified element:

$('#myDiv p').text('这是修改后的段落内容。');
//将myDiv下的p元素的文本内容修改为“这是修改后的段落内容。”

5. Use the attr() method to set the specified element Attribute value:

$('#myDiv ul').attr('class', 'myList');
//将myDiv下的ul元素的class属性值修改为“myList”

6. Use the find() method to find child elements:

$('#myDiv').find('li');
//查找myDiv下的所有li元素

7. Use the eq() method to return the element at the specified index position:

$('#myDiv ul li').eq(1);
//返回myDiv下的ul元素的第二个列表项（索引位置为1）

Through the above examples, we can see that the simplicity and ease of use of Jquery allows us to quickly complete the addition, deletion, modification and query operations of HTML page elements, which greatly improves our development efficiency and allows us to focus more on implementing functions and interactions.

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