Detailed explanation of jQuery traversal methods: What do you know?

jQuery is a popular JavaScript library that provides many convenient and fast methods to manipulate DOM elements. In jQuery, traversal methods are very commonly used. They can help us find, filter and manipulate DOM elements. This article will introduce several commonly used jQuery traversal methods in detail, and attach specific code examples. I hope it will be helpful to everyone.

1. each()

each() method is one of the most commonly used methods for traversing elements in a jQuery object collection. It accepts a callback function as argument, which will be executed on each element. Here is an example:

$("li").each(function(index) {
  console.log(index + ": " + $(this).text());
});

The above code will traverse all <li> elements and output their serial numbers and text content.

2. find()

find() method is used to find child elements that match the selector in the current element collection. Here is an example:

$("#container").find("p").css("color", "red");

The above code will set the text color of all <p></p> elements in the #container element to red.

3. filter()

filter() method is used to filter elements that meet conditions in the current element collection. Here is an example:

$("li").filter(":even").css("background-color", "lightgrey");

The above code will select all even-numbered <li> elements and set their background color to light gray.

4. not()

not() method is used to remove qualified elements from the current element collection. Here is an example:

$("li").not(".special").css("font-weight", "bold");

The above code will select all <li> elements that do not have a special class and make their font bold.

5. children()

children() method is used to select the child elements of the current element. Here is an example:

$("#container").children().css("border", "1px solid black");

The above code will add a black border to all child elements of the #container element.

6. siblings()

siblings() method is used to select sibling elements of the current element. The following is an example:

$("li").siblings().addClass("highlight");

The above code will add the highlight class to the sibling elements of all <li> elements to achieve the highlighting effect.

The above is a detailed introduction and code examples of several commonly used jQuery traversal methods. I hope this article can help you become more proficient in using these methods to manipulate DOM elements and improve development efficiency.

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