Web front end -- jquery

Hee hee hee hee hee 2020-11-13 01:57:45
web end jquery


jQuery

One 、jQuery Introduce

jQuery Is currently the most widely used javascript function library . According to statistics , Top of the world 100 Wan's website , Yes 46% Use jQuery, Far more than any other library . Microsoft even put jQuery As their official library .
jquery It's a library of functions , One js file , Page use script The tag introduces this js Documents can be used .
Download address :
jQuery Official website : http://jquery.com/
 Insert picture description here

jQuery load

Write the statement that gets the element to the page header , There will be an error because the element has not been loaded ,jquery Provides ready To solve this problem , It's faster than the native window.onload faster .
Detailed writing :

<script type="text/javascript">
$(document).ready(function(){

......
});
</script>

Abbreviation :

<script type="text/javascript">
$(function(){

......
});
</script>

Two 、jQuery Selectors

Basic selector

Select a web element , And then do something about it , jquery Selectors jquery Selectors can quickly select elements ,
Choose the rules and css Same pattern , Use length Attribute to determine whether the selection is successful .
jquery Usage thought 1 : Select a web element , And then do something about it

$(document) // Select the entire document object
$('li') // Choose all li Elements
$('#myId') // choice id by myId Web elements of
$('.myClass') // choice class by myClass The elements of
$('input[name=first]') // choice name Attribute is equal to the first Of input Elements
$('#ul1 li span') // choice id For the purpose of ul1 All under the element li Under the span Elements
Selectors modify filtering
$('#ul1 li:first') // choice id by ul1 The first one under the element li
$('#ul1 li:odd') // choice id by ul1 Under the element li Odd lines
$('#ul1 li:eq(2)') // choice id by ul1 Under the element 3 individual li
$('#ul1 li:gt(2)') // choice id by ul1 The first three after the element li
$('#myForm :input') // Select the input Elements
$('div:visible') // Choose the visible div Elements
$('div').has('p'); // Choose to include p Elemental div Elements
Selector functions filter
$('div').not('.myClass'); // choice class It's not equal to myClass Of div Elements
$('div').filter('.myClass'); // choice class be equal to myClass Of div Elements
$('div').first(); // Select the first 1 individual div Elements
$('div').eq(5); // Select the first 6 individual div Elements
Selector shift
$('div').prev('p'); // choice div The first one in front of the element p Elements
$('div').next('p'); // choice div The first one after the element p Elements
$('div').closest('form'); // Choose to leave div The nearest one form Parent element
$('div').parent(); // choice div Parent element of
$('div').children(); // choice div All the sub elements of
$('div').siblings(); // choice div The same level element of
$('div').find('.myClass'); // choice div Internal class be equal to myClass The elements of
Operate inter line style

jquery Usage Thought II The same function completes the value and assignment

// obtain div The style of
$("div").css("width");
$("div").css("color");
// Set up div The style of
$("div").css("width","30px");
$("div").css("height","30px");
$("div").css({fontSize:"30px",color:"red"});
$("#div1").addClass("divClass2")
// by id by div1 Add style to the object divClass2
$("#div1").removeClass("divClass")
// remove id by div1 Of class be known as divClass The style of
$("#div1").removeClass("divClass divClass2")
// Remove multiple styles
$("#div1").toggleClass("anotherClass")
// Repeat switching anotherClass style

3、 ... and 、jQuery Attribute operation

Set up html Content
// Take out html Content
var $htm = $('#div1').html();
// Set up html Content
$('#div1').html('<span> Add text </span>');
// Take out the text
var $htm = $('#div1').text();
// Set text content
$('#div1').text('<span> Add text </span>');
Setting property values
// Take out the address of the picture
var $src = $('#img1').attr('src');
// Set the address and alt attribute
$('#img1').attr({ src: "test.jpg", alt: "Test Image" });
binding click event
$('#btn1').click(function(){
// Inside this Refers to the native object
// Use jquery Object use $(this)
})
jquery Special effects
fadeOut() Fade out
fadeToggle() Switch between fade in and fade out
hide() Hidden elements
show() Display element
toggle() Show or hide an element in turn
slideDown() Expand down
slideUp() Roll up
slideToggle() Expand or roll up an element in turn
版权声明
本文为[Hee hee hee hee hee]所创,转载请带上原文链接,感谢

  1. [front end -- JavaScript] knowledge point (IV) -- memory leakage in the project (I)
  2. This mechanism in JS
  3. Vue 3.0 source code learning 1 --- rendering process of components
  4. Learning the realization of canvas and simple drawing
  5. gin里获取http请求过来的参数
  6. vue3的新特性
  7. Get the parameters from HTTP request in gin
  8. New features of vue3
  9. vue-cli 引入腾讯地图(最新 api,rocketmq原理面试
  10. Vue 学习笔记(3,免费Java高级工程师学习资源
  11. Vue 学习笔记(2,Java编程视频教程
  12. Vue cli introduces Tencent maps (the latest API, rocketmq)
  13. Vue learning notes (3, free Java senior engineer learning resources)
  14. Vue learning notes (2, Java programming video tutorial)
  15. 【Vue】—props属性
  16. 【Vue】—创建组件
  17. [Vue] - props attribute
  18. [Vue] - create component
  19. 浅谈vue响应式原理及发布订阅模式和观察者模式
  20. On Vue responsive principle, publish subscribe mode and observer mode
  21. 浅谈vue响应式原理及发布订阅模式和观察者模式
  22. On Vue responsive principle, publish subscribe mode and observer mode
  23. Xiaobai can understand it. It only takes 4 steps to solve the problem of Vue keep alive cache component
  24. Publish, subscribe and observer of design patterns
  25. Summary of common content added in ES6 + (II)
  26. No.8 Vue element admin learning (III) vuex learning and login method analysis
  27. Write a mini webpack project construction tool
  28. Shopping cart (front-end static page preparation)
  29. Introduction to the fluent platform
  30. Webpack5 cache
  31. The difference between drop-down box select option and datalist
  32. CSS review (III)
  33. Node.js学习笔记【七】
  34. Node.js learning notes [VII]
  35. Vue Router根据后台数据加载不同的组件(思考-&gt;实现-&gt;不止于实现)
  36. Vue router loads different components according to background data (thinking - & gt; Implementation - & gt; (more than implementation)
  37. 【JQuery框架,Java编程教程视频下载
  38. [jQuery framework, Java programming tutorial video download
  39. Vue Router根据后台数据加载不同的组件(思考-&gt;实现-&gt;不止于实现)
  40. Vue router loads different components according to background data (thinking - & gt; Implementation - & gt; (more than implementation)
  41. 【Vue,阿里P8大佬亲自教你
  42. 【Vue基础知识总结 5,字节跳动算法工程师面试经验
  43. [Vue, Ali P8 teaches you personally
  44. [Vue basic knowledge summary 5. Interview experience of byte beating Algorithm Engineer
  45. 【问题记录】- 谷歌浏览器 Html生成PDF
  46. [problem record] - PDF generated by Google browser HTML
  47. 【问题记录】- 谷歌浏览器 Html生成PDF
  48. [problem record] - PDF generated by Google browser HTML
  49. 【JavaScript】查漏补缺 —数组中reduce()方法
  50. [JavaScript] leak checking and defect filling - reduce() method in array
  51. 【重识 HTML (3),350道Java面试真题分享
  52. 【重识 HTML (2),Java并发编程必会的多线程你竟然还不会
  53. 【重识 HTML (1),二本Java小菜鸟4面字节跳动被秒成渣渣
  54. [re recognize HTML (3) and share 350 real Java interview questions
  55. [re recognize HTML (2). Multithreading is a must for Java Concurrent Programming. How dare you not
  56. [re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds
  57. 【重识 HTML ,nginx面试题阿里
  58. 【重识 HTML (4),ELK原来这么简单
  59. [re recognize HTML, nginx interview questions]
  60. [re recognize HTML (4). Elk is so simple