In jQuery: first-child selector usage example_jquery

The example in this article describes the usage of: first-child selector in jQuery. Share it with everyone for your reference. The specific analysis is as follows:

This selector matches the first child element of the parent element.

Grammar structure:

Copy code The code is as follows:

$(":first-child")

This selector is generally used in conjunction with other selectors, such as class selectors, element selectors, etc. . For example:

Copy code The code is as follows:

$("ul li:first-child").css("color", "blue")

The above code can set the font color in the first li element under the parent element to blue.

Note: It is necessary to explain the concept in combination with the above code. The parent element mentioned here is not li, but the parent element of li. Many people often mistakenly think that it matches the last element among the child elements of the li element.

Example code:

Copy code The code is as follows:

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Click to see the effect

In the above code, clicking the button can set the text color of the first li element under each ul to blue.

I hope this article will be helpful to everyone’s jQuery programming.