Summary of jQuery methods (with examples)-JS Tutorial-php.cn

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Introduction to jQuery

jQuery is a lightweight JS library for operating DOM. It mainly includes the following functions:

HTML element selection and operation

HTML events Function

HTML DOM traversal and modification

CSS operation

JavaScript special effects and animation

AJAX

jQuery-based plug-in

The advantage of jQuery is that it is compatible with all major browsers, including Internet Explorer 6!

jQuery syntax

$(selector).action()

Document is loaded The difference between event

$(document).ready(function() {
  // 代码...
});

// 简写方式
$(function() {
  // 代码...
});

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$(document).ready and window.onload

$(document).ready and window.onload are both on page loading Functions that are fully executed are not much different in most cases.
$(document).ready: It is executed after the DOM structure is drawn, without having to wait until it is loaded. This means that it will be executed after the DOM tree is loaded, without waiting for the images or other external files in the page to be loaded. And you can write multiple .ready.
window.onload: All elements of the page have been loaded, including pictures and other elements. Can only be executed once.

jQuery selector

jQuery selector is based on the existing CSS selector

$('*')
$('p ')
$('ul li')
$('ul li:last-child')
...

jQuery Event

Mouse events	Keyboard events	Form events	Document/Window events
click	keypress	submit	load
dbclick	keydown	change	resize
mouseenter	keyup	focus	scroll
mouseleave		blur	unload
hover

#Commonly used jQuery event methods

dbclick() Double-click event
mouseenter() Mouse passing through element event
mouseleave() Mouse leaving element event
mousedown() Move the mouse over the element and press the mouse event
mouseup() Hold down the mouse and move it over the element and release the mouse event
hover() Mouse hover event
focus() Form element focus event
blur() Form element loses focus event
submit() Form submission event
change() Form element value change event
keypress() Keyboard key press event
keydown() Keyboard key press event
keyup() Keyboard key release event
load() Specified element loading completion execution event (obsolete after version 1.8)
resize() window size change event
scroll() scroll listening event

jQuery effect

$(selector).action(speed,callback)

VariableDescriptionselectorSelectoractionEventspeedSpeed, milliseconds, can also be 'slow', 'fast'##callbackShow hide





Callback function

hide() hide the element

show() show the element
toggle() show the element being Hidden elements, hide displayed elements
Fade in and out

fadeIn() Fade in

fadeOut() Fade out
fadeToggle () The faded element fades in, the faded element fades out
fadeTo() Fade to the given opacity
$(selector).fadeTo(speed,opacity,callback) ;
The opacity value is between 0 and 1

slideDown() Slide down to expand the element

slideDown( ) Slide up to collapse the element
slideToggle() Slide up to collapse the expanded element, slide down to display the collapsed element
animation

$(selector). animate({params},speed,callback);

ParameterparamsspeedcallbackInstance

Description	Whether it is required
Define the css properties that form the animation	Must
Speed , milliseconds, can also be 'slow', 'fast'	optional
callback function	optional Select

$("button").click(function() {
  $("p").animate({
    left: "250px",
    opacity: "0.5",
    height: "150px",
    width: "150px"
  });
});

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Stop animation

$(selector).stop(stopAll, goToEnd);

ParameterstopAllgoToEnd

jQuery 链(Chaining)

通过 jQuery，可以把动作/方法链接在一起。

Chaining 允许我们在一条语句中运行多个 jQuery 方法（在相同的元素上，浏览器就不必多次查找相同的元素。

$("#p1")
  .css("color", "red")
  .slideUp(2000)
  .slideDown(2000);

// "p1" 元素首先会变为红色，然后向上滑动，再然后向下滑动

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jQuery HTML

jQuery 提供一系列与 DOM 相关的方法，这使访问和操作元素和属性变得很容易。

获取内容和属性

获取内容

text() 设置或返回所选元素的文本内容
html() 设置或返回所选元素的内容（包括 HTML 标记）
val() 设置或返回表单字段的值

获取属性

attr() 设置或者返回所选的属性的值

// 获取属性
$('#test').attr('href'）

// 设置属性
$('#test').attr('href','http://www.baidu.com')

$('#test').attr({
    href: 'http://www.baidu.com',
    title: '百度'
})

// 回掉函数
$('#test').attr('href', function(i, origValue){
    // i 被选元素列表中当前元素的下标
    // origValue 原始值
    return origValue + '/jquery'
  })

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添加删除元素

append() 在被选元素的结尾插入内容
prepend() 在被选元素的开头插入内容
after() 在被选元素之后插入内容
before() 在被选元素之前插入内容
remove() 删除被选元素（及其子元素）
empty() 从被选元素中删除子元素

jQuery remove() 方法也可接受一个参数，允许您对被删元素进行过滤。该参数可以是任何 jQuery 选择器的语法。下面的代码表示删除所有 p 元素中类名是 italic 的元素

$('p').remove('.italic')

获取并设置 css 类

addClass() 向被选元素添加一个或多个类
removeClass() 从被选元素删除一个或多个类
toggleClass() 对被选元素进行添加/删除类的切换操作
css() 设置或返回样式属性

// 返回样式属性
$("p").css("background-color");

// 设置样式属性
$("p").css("background-color", "yellow");
// 或者
$("p").css({ "background-color": "yellow", "font-size": "200%" });

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尺寸方法

width() 元素宽度
height() 元素高度
innerWidth() 包含 padding 宽度
innerHeight() 包含 padding 高度
outerWidth() 包含 padding、border 宽度
outerHeight() 包含 padding、border 高度
outerWidth(true) 包含 padding、border、margin 宽度
outerHeight(true) 包含 padding、border、margin 高度

元素遍历

祖先元素：

parent() 返回被选元素的直接父元素，该方法只会向上一级对 DOM 树进行遍历。
parents() 返回被选元素的所有祖先元素，它一路向上直到文档的根元素 ()。
parentsUntil() parentsUntil() 方法返回介于两个给定元素之间的所有祖先元素。

$(document).ready(function() {
  // p > ul > li > span
  $("span").parentsUntil("p");
  // 返回 ul 和 li
});

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后代元素：

children() 返回被选元素的所有直接子元素。
find() 方法返回被选元素的后代元素，一路向下直到最后一个后代。

$(document).ready(function() {
  $("p").find("span");
});

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同胞元素：

siblings() 返回被选元素的所有同胞元素。
next() 返回被选元素的下一个同胞元素。
nextAll() 返回被选元素的所有跟随的同胞元素。
nextUntil() 返回介于两个给定参数之间的所有跟随的同胞元素。
prev() 返回被选元素的上一个同胞元素。
prevAll() 返回被选元素之前的所有的同胞元素。
prevUntil() 返回介于两个给定参数之间的所有前方的同胞元素。

元素过滤：

first() 返回被选元素的首个元素。
last() 返回被选元素的最后一个元素。
eq() 返回被选元素中带有指定索引号的元素。
filter() 方法允许您规定一个标准。不匹配这个标准的元素会被从集合中删除，匹配的元素会被返回。
not() 方法返回不匹配标准的所有元素。

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Description	Whether it is required
Whether the animation queue should be cleared, the default is false	Optional
Whether the current animation should be completed immediately	Optional

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