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JQuery: first-child selector usage example, jqueryfirst-child
This document describes the usage of the first-child selector in jQuery. Share it with you for your reference. The specific analysis is as follows:
This selector can match the first child element of the parent element.
Syntax structure:
Copy codeThe Code is as follows: $ (": first-child ")
This selector should also be used with other selectors, such as class selector and element selector. For example:
Copy codeThe Code is as follows: $ ("ul li: first-child" ).css ("color", "blue ")
The above Code sets the font color of the first li element under the parent element to blue.
Note:Here it is necessary to combine the above Code to describe the concept. The parent element mentioned here is not li, but the parent element of li. Many people often mistakenly think that it is the last element in the child element that matches the li element.
Instance code:
Copy codeThe Code is as follows:
<! Doctype html>
<Html>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8">
<Meta name = "author" content = "http://www.bkjia.com/"/>
<Title>: first-child selector-helping customers </title>
<Script type = "text/javascript" src = "mytest/jQuery/jquery-1.8.3.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Button"). click (function (){
$ ("Ul li: first-child" ).css ("color", "blue ")
})
})
</Script>
</Head>
<Body>
<Div>
<Ul>
<Li class = "houtai" title = "asp"> ASP tutorial </li>
<Li class = "houtai" title = "net"> ASP. NET tutorial </li>
<Li class = "houtai" title = "php"> PHP tutorial </li>
</Ul>
<Ul>
<Li class = "qiantai" title = "html"> html tutorial </li>
<Li class = "qiantai" title = "div"> DIV + CSS tutorial </li>
<Li class = "qiantai" title = "jquery"> jQUERY tutorial </li>
<Li class = "qiantai" title = "js"> jAVAScript tutorial </li>
</Ul>
</Div>
<Button> click to view results </button>
</Body>
</Html>
In the above Code, click the button to set the text color of the first li element under every ul to blue.
I hope this article will help you with jQuery programming.
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