Detailed explanation of jQuery sub-element filter selector
This article mainly introduces the relevant information of the jQuery selector's child element filter selector in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.
The example in this article shares the specific code of the jQuery sub-element filter selector for your reference. The specific content is as follows
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Untitled Document</title> <link rel="stylesheet" type="text/css" href="css/style.css" rel="external nofollow" > <style type="text/css"> p, span, p { width: 140px; height: 140px; margin: 5px; background: #aaa; border: #000 1px solid; float: left; font-size: 17px; font-family: Verdana; } p.mini { width: 55px; height: 55px; background-color: #aaa; font-size: 12px; } p.hide { display: none; } </style> <script type="text/javascript" src="jquery-1.7.2.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#btn1").click(function(){ //选取子元素, 需要在选择器前添加一个空格. $("p.one :nth-child(2)").css("background", "#ffbbaa"); }); $("#btn2").click(function(){ $("p.one :first-child").css("background", "#ffbbaa"); }); $("#btn3").click(function(){ $("p.one :last-child").css("background", "#ffbbaa"); }); $("#btn4").click(function(){ $("p.one :only-child").css("background", "#ffbbaa"); }); }); </script> </head> <body> <input type="button" value="选取每个class为one的p父元素下的第2个子元素." id="btn1"/> <input type="button" value="选取每个class为one的p父元素下的第一个子元素." id="btn2"/> <input type="button" value="选取每个class为one的p父元素下的最后一个子元素." id="btn3"/> <input type="button" value="如果class为one的p父元素下的仅仅只有一个子元素,那么选中这个子元素." id="btn4"/> <br><br> <p class="one" id="one"> id 为 one,class 为 one 的p <p class="mini">class为mini</p> </p> <p class="one" id="two" title="test"> id为two,class为one,title为test的p <p class="mini" title="other">class为mini,title为other</p> <p class="mini" title="test">class为mini,title为test</p> </p> <p class="one"> <p class="mini">class为mini</p> <p class="mini">class为mini</p> <p class="mini">class为mini</p> <p class="mini"></p> </p> <p class="one"> <p class="mini">class为mini</p> <p class="mini">class为mini</p> <p class="mini">class为mini</p> <p class="mini" title="tesst">class为mini,title为tesst</p> </p> <p style="display:none;" class="none">style的display为"none"的p</p> <p class="hide">class为"hide"的p</p> <p> 包含input的type为"hidden"的p<input type="hidden" value="123456789" size="8"> </p> <p id="mover">正在执行动画的p元素.</p> </body> </html>
Related recommendations:
jQuery selector sharing examples of attribute filtering selectors
Attribute filtering selectors in jquery
Detailed explanation of attribute filter selector of jquery selector
The above is the detailed content of Detailed explanation of jQuery sub-element filter selector. For more information, please follow other related articles on the PHP Chinese website!

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Mac version
God-level code editing software (SublimeText3)