Detailed interpretation of the child method in jQuery

The child() method in jQuery is a very useful method for selecting child elements of matching elements. In jQuery, the child() method is used to specify the direct child elements under a certain parent element.

Below we will explain the child() method in detail and provide specific code examples:

The syntax of the child() method

The syntax of the child() method is as follows:

$(selector).child(childSelector)

Sample code

Suppose we have the following HTML structure:

<div id="parent">
    <div class="child">子元素1</div>
    <div class="child">子元素2</div>
</div>

Use the child() method to select child elements

We can use the child() method to select Child elements under the parent element, for example, select all child elements under the element with the id of parent:

$("#parent").child(".child").css("color", "red");

In this example, we select all child elements with the class of child under the element with the id of parent, and Set their text color to red.

Sample Code 2

As another example, assume we have the following HTML structure:

<ul id="menu">
    <li>菜单1</li>
    <li>菜单2
        <ul>
            <li>子菜单1</li>
            <li>子菜单2</li>
        </ul>
    </li>
    <li>菜单3</li>
</ul>

Use the child() method to select a submenu

We can Use the child() method to select the submenu under menu 2:

$("#menu > li:nth-child(2)").child("ul li").css("font-weight", "bold");

In this example, we select all li child elements under the ul element under menu 2 and make their fonts bold.

Summary

Through the above example, we can see the power of the child() method in jQuery. It can help us easily select child elements under the parent element and implement various operations. The child() method is a very practical selector when we need to accurately select the direct child elements under a certain parent element.

I hope this article will be helpful to you and make you more proficient in using the child() method in jQuery.

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