Web front end -- jquery

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


Abbreviation :

<script type="text/javascript">


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
// Set up div The style of
// by id by div1 Add style to the object divClass2
// remove id by div1 Of class be known as divClass The style of
$("#div1").removeClass("divClass divClass2")
// Remove multiple styles
// 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
// 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
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