


A concise summary of jQuery selectors (including usage examples, clear at a glance)_jquery
本文现在对所有已知的 jquery 选择器做一个总结,深刻而熟练的掌握这些选择器,对我们快速的写各种 jquery 效果大有帮助!下面就对 jquery 各种选择做一个罗列吧!由于 jquery 用法非常简单,这里就不再举各种例子加深理解了。
选择器 | 实例 | 选取 |
---|---|---|
* | $("#item *") | 选择 id 属性为 item 下的所有元素 |
#id | $("#lastname") | id="lastname" 的元素 |
.class | $(".intro") | 所有 class="intro" 的元素 |
element | $("p") | 所有 元素 |
.class.class | $(".intro.demo") | 所有 class="intro" 且 class="demo" 的元素 |
:first | $("p:first") | 第一个 元素 |
:last | $("p:last") | 最后一个 元素 |
:even | $("tr:even") | 所有偶数 |
:odd | $("tr:odd") | 所有奇数 |
:next | $('.item').next('div') | class为 item 的下一个 div 兄弟元素,等价于 $('.item + div') |
:prev | $('.item').prev('div') | class为 item 的上一个 div 兄弟元素 |
:nextAll | $('.item').nextAll('div') | class 为 item 之后的所有的 div 兄弟元素,等价于 $('.inside ~ div') |
:parent > child | $('div > span') | 选取 div 下的第一代 span 元素,又称直系子元素 |
:parent | $('.item:parent') | 选取 class 为 item 的元素的父级元素 |
:eq(index) | $("ul li:eq(3)") | 列表中的第四个元素(index 从 0 开始) |
:gt(no) | $("ul li:gt(3)") | 列出 index 大于 3 的元素 |
:lt(no) | $("ul li:lt(3)") | 列出 index 小于 3 的元素 |
:not(selector) | $("input:not(:empty)") $("input:not(.must)") | 所有不为空的 input 元素;所有 class 属性不为 must 的元素 |
:header | $(":header") | 所有标题元素 - |
:animated | 所有动画元素 | |
:contains(text) | $("div:contains('www.phpernote.com')") | 所有 div 元素中包含 www.phpernote.com 字符串的所有元素 |
:empty | $(".item:empty") | 所有 class 属性为 item 的元素中无子(元素)节点的所有元素 |
:hidden | $("p:hidden") | 所有隐藏的 元素 |
:has | $('.item:has(span)') | 所有 class 属性为 item 的元素中包含有 span 的所有元素(不分是否直系) |
:visible | $("table:visible") | 所有可见的表格 |
s1,s2,s3 | $("th,td,.intro") | 所有带有匹配选择的元素 |
[attribute] | $("a[href]") | 所有带有 href 属性的 a 标签元素 |
[attribute=value] | $("[href='#']") | All elements whose href attribute value is equal to "#" |
[attribute!=value] | $("[href!='#']") | All elements whose href attribute value is not equal to "#" |
[attribute$=value] | $("[href$='.jpg']") | The value of all href attributes contains elements ending with ".jpg" |
:input | $(":input") | All elements |
:text | $(":text") | All elements of type="text" |
:password | $(":password") | All elements with type="password" |
:radio | $(":radio") | All elements of type="radio" |
:checkbox | $(":checkbox") | All elements of type="checkbox" |
:submit | $(":submit") | All elements of type="submit" |
:reset | $(":reset") | All elements with type="reset" |
:button | $(":button") | All elements of type="button" |
:image | $(":image") | All elements of type="image" |
:file | $(":file") | All elements of type="file" |
:enabled | $(":enabled") | All activated input elements |
:disabled | $(":disabled") | All disabled input elements |
:selected | $(":selected") | All selected input elements |
:checked | $(":checked") | All selected input elements |

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.

The power of the JavaScript framework lies in simplifying development, improving user experience and application performance. When choosing a framework, consider: 1. Project size and complexity, 2. Team experience, 3. Ecosystem and community support.

Introduction I know you may find it strange, what exactly does JavaScript, C and browser have to do? They seem to be unrelated, but in fact, they play a very important role in modern web development. Today we will discuss the close connection between these three. Through this article, you will learn how JavaScript runs in the browser, the role of C in the browser engine, and how they work together to drive rendering and interaction of web pages. We all know the relationship between JavaScript and browser. JavaScript is the core language of front-end development. It runs directly in the browser, making web pages vivid and interesting. Have you ever wondered why JavaScr


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