Summary of commonly used JQuery functions and functions

1. Document loading completion execution function

$(document).ready(function(){
alert("开始了");
});

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2. Add/Remove CSS classes

$("#some-id").addClass("NewClassName");
$("#some-id").removeClass("ClassNameToBeRemoved");

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3. Selectors take advantage of the capabilities of CSS and Xpath (XML Path Language) selectors, as well as jQuery’s unique selectors

3.1 Commonly used:

1. Select all paragraphs in the document according to the tag name: $('p')

2. According to ID: $("#some-id")

3. Class: $('.some-class')

3.2 Using CSS selectors:

$("#some-id > li") 选择特定id下的所有子li元素
$("#some-id li:not(.horizontal)") 伪类选择，特定id下所有没有.horizontal 类的li元素

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3.3 Use XPath selector:

Attribute selection: $("a[@title]") selects all links with title attribute

$("div[ol]") selects all div elements that contain an ol element

$('a[@href^="mailto:%22]') selects all href attributes [@href] and the attribute value starts with mailto^="mailto" (^ identifies the string starting with $ String knot

tail, * represents any position in the string)

$('a[@href$=".pdf"]') selects all links with href attribute and the attribute value ends with .pdf

$('a[@href*="mysite.com"]') selects all links where mysite.com appears anywhere in href (including mysite.com)

3.4JQuery custom selector (filter, filter out all elements that meet a certain condition from the selected result set), similar to CSS pseudo-class selector, starting with ":"

1.$('div.horizontal:eq(1)') selects the 2nd item in the div collection with class horizontal

$('div:nth-child(1)') selects all divs that are the 1st child element of its parent element

2. Custom selectors: odd and :even to select odd and even rows

$('tr:odd').addClass('odd'); //Filter and select odd elements in the result set

$('tr:even').addClass('even'); //Filter and select even elements in the result set

3. Custom selector: contains()

$('td:contains("Henry")') selects all tables containing the Henry string

3.5JQuery selection function

1.$('#some-id').parent() selects the parent element of a specific element

2.$('#some-id').next() selects the next nearest sibling element of a specific element

3.$('#some-id').siblings() selects all sibling elements of a specific element

4.$('#some-id').find('.some-class') selects all elements containing a specific class under a specific element

5.$('#some-id').find('td').not(':contains("Henry")') Select all elements whose table content under a specific element does not contain Henry

5.$('#some-id').find('td').not(':contains("Henry")').end() .end() means going back to the last .find( ) element at

3.6 Access DOM elements, use the get() method to obtain from the selected JQuery object, and remove the JQuery packaging

var myTag = $('#some-id').get(0).tagName;
var myTag = $('#some-id')[0].tagName; //与上面的等效

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4. Events (all events are bound to a certain element)

4.1 Binding events

$("#some-id").bind("click", function(){ })
$("#some-id").unbind("click", bindedFunctionName); //移除已绑定的事件，前提是绑定的函数有名称（不是匿名函数）
$("#some-id").click(function(){ })

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4.2 Composite function binding event

$("#some-id").toggle(function(){ } ,function(){ }); //交替执行
$(“#some-id”).toggleClass("hidden"); // 添加/删除类交替进行
$("#some-id").hover(function(){ }, function(){ }); //鼠标进入元素时执行第一个函数，离开元素时执行第二个函数
$("#some-id").one("click", functionName); //只需触发一次，随后便立即解除绑定

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4.3 Imitate users to trigger an event

$("#some-id").trigger("click"); //Trigger the click event of a specific element

5. Add effects to elements

5.1 Read or set CSS style attributes

$("#some-id").css("property") //Read style value
$('#some-id').css('property', 'value') //Set a style value
$('#some-id').css({property1: 'value1', property2: 'value2'}) //Set multiple style attributes

5.2 Change font size

$(document).ready({
$('#button-id').click(function(){
var currentSize = $('#text-id').css('fontSize'); //获取字体大小，如30px
var num = parseFloat(currentSize, 10); //将值转为浮点数，.parseFloat( , )为javascript内置函数，这里是转为10进制的浮点数
var unit = currentSize.slice(-2); //获取单位名称，如px，.slice()是javascript内置函数，获取字符串指从定位置开始的子字符串，-2表示倒数两个字符
num *= 1.5;
$('text-id').css('fontSize', num + unit); //设置字体大小样式
});
});

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5.3隐藏和显示

$('#some-id').show(); //无效果，会自动记录原来的display属性值（如：block, inline），再回复display值
$('#some-id').hide(); //无效果，等效于：$('#some-id').css('display', 'none'); 隐藏元素，不保留物理位置
大小、透明度逐渐变化的显示或隐藏

$('#some-id').show('slow'); //指定显示速度，在指定时间内元素的高、宽、不透明度逐渐增加到属性值，有：slow是0.6秒，normal是0.4秒，fast是0.2秒，或者直接填入毫秒数
$('#some-id').hide(800); //与.show()指定速度显示一样，指定时间内高、宽、不透明度逐渐减小到0

淡入淡出

$('some-id').fadeIn('slow'); //指定时间内不透明度属性值由0增加到1
$('some-id').fadeOut('slow'); //指定时间内不透明度值由1减小到0

5.4构建具有动画效果的show

主要调用.animate()方法，其有4个参数：包含样式属性及值的映射；可选的速度参数；可选的缓动类型；可选的回调函数；

1.并发显示多个效果

$('#some-id').animate({height: 'show', width: 'show', opacity: 'show'}, 'slow', function(){ alert('动画显示元素');});
$('div .button').animate({left:600, height:44}, 'slow'); //水平位置从0移动到600，高度由0增加到44

2.排队显示多个效果，级联多个.animate()，一个效果显示完了再显示下一个效果

$('#some-id').animate({left:600}, 'slow').animate({height: 44}, 'slow');
6DOM操作

6.1属性操作

$('#some-id').attr('property'); //获取属性
$('#some-id').attr('property','value'); //设置属性
$('#some-id').attr({'property1': 'value1', 'property2': 'value2'}); //设置多个属性
修改一个段落中所有链接，并给每个链接附上新的id号
$('div p .content a').each(function(index){
$(this).attr({
'rel': 'external',
'id': 'link_' + index
});
});
// ********* JQuery的.each()类似一个迭代器，给其传递的参数index类似一个计数器 *********

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6.2插入新元素

1.将元素插入到其他元素前面：.insertBefore()和.before()

2.将元素插入到其他元素后面：.insertAfter()和after()

3.将元素插入到其他元素内部或后面（相当于追加一个元素）：appendTo()和append()

4.将元素插入到其他元素内部或前面（相当于追加一个元素）：prependTo()和prepend()

6.3包装元素，将元素包装到其他元素中 .wrap();

$('#some-id').wrap('

'); // 将某一特定元素包装到li中，即在特定元素外围添加一个包围元素

6.4复制元素 .clone()

1.$('#some-id').clone().appendTo($('body'));

2.复制深度，当传入false参数时，只复制匹配上的元素，其内部的其他元素不复制