jQuery is a popular JavaScript library that provides a simple and powerful way to manipulate the DOM. In jQuery, there is a function called the wrap node method that wraps the target element in a new parent element.
The syntax of the wrapping node method is as follows:
$(selector).wrap(wrappingElement);
Among them, the parameter selector is a standard CSS selector used to select elements, indicating the target element to be wrapped; the parameter wrappingElement is a parameter that can be A string, function, or jQuery object that represents the new parent element to be used to wrap the target element.
When we execute this method, it wraps the target element in the new parent element. If the parameter wrappingElement is a function, then it should return a new parent element to be wrapped.
The following is a practical example, we wrap a p element in a div element:
<!DOCTYPE html>
<html>
<head>
<title>jQuery包裹节点方法</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
<p>这是一个段落</p>
<script>
$( "p" ).wrap( "<div></div>" );
</script>
</body>
</html>In this example, we select a p element and wrap it in a in a new div element. After we execute the above code and view the HTML code in the browser, you will see that the p element is wrapped in a div element.
In addition to the wrap method, jQuery also provides several other related methods:
1. wrapAll method
This method wraps an element in a single parent element middle.
The syntax is as follows:
$(selector).wrapAll(wrappingElement);
The parameters are the same as the wrap method, and wrappingElement represents the parent element to be wrapped.
2. wrapInner method
This method wraps the content of the selected element in a new element.
The syntax is as follows:
$(selector).wrapInner(wrappingElement);
The parameter wrappingElement represents the wrapping element to be created.
3. unwrap method
This method is used to remove the parent element of the selected element to show the actual position of the selected element in the document.
The syntax is as follows:
$(selector).unwrap();
Example:
<!DOCTYPE html>
<html>
<head>
<title>jQuery包裹节点方法</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
<div class="wrapper">
<p>这是一个段落</p>
</div>
<script>
$( "p" ).unwrap();
</script>
</body>
</html>In this example, we select the div element containing the p element and execute the unwrap method on the p element. When we execute the code, only the div element that originally contained the p element is left in the HTML document.
The wrapped node method is a very useful method in jQuery, which allows us to easily put elements into new parent elements to create reusable HTML modules. By using the wrap method, we can greatly improve the readability and maintainability of the code, and make the HTML document cleaner and easier to understand.
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