JS learning simple usage of jquery

reallydss1985 2021-05-03 11:26:52
js learning simple usage jquery


One 、jQuery How to get elements

jQuery The basic design idea and main usage of , Namely ' Select a web element , And then do something about it ',jQuery Use $(selector) To get the operation elements of the page ,selector Accept strings or arrays of elements

Selection expressions can use CSS Selectors can also be used jQuery Specific expressions :

//CSS Selectors
$(document) // Select the entire document object
$('#myId') // choice ID by myId Web elements of
$('div.myClass') // choice class by myClass Of div Elements
$('input[name=first]') // choice name Attribute is equal to the first Of input Elements
//jQuery Specific expressions
$('a:first') // Select the first one in the page a Elements
$('tr:odd') // Select odd rows of the table
$('#myForm :input') // Select the input Elements
$('div:visible') // Choose the visible div Elements
$('div:gt(2)') // Choose all div Elements , Except for the first three
$('div:animated') // Select the currently animated div Elements
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Two 、jQuery What is the chain operation of

JQuery One of my design ideas is , Using an idea called chain programming , After getting the elements , You can do a series of operations on it , And all operations can be connected , It's like a chain of execution . for example $('div').find('a').eq(2).html('go')

3、 ... and 、jQuery How to create elements

jQuery The creation elements have been encapsulated , We can pass it in directly html character string ,jQuery Will help us automatically create nodes . for example :

$(`
<div>
<span class="red">
this is new node
</div>
</div>`)
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Four 、jQuery How to move elements

jQuery Four team methods are provided to manipulate the movement of elements in a web page

.insertAfter()` and .after(): Outside the existing elements , Insert elements from behind
.insertBefore() and .before(): Outside the existing elements , Insert elements from the front
.appendTo() and .append(): Inside the existing elements , Insert elements from behind
.prependTo() and .prepend(): Inside the existing elements , Insert elements from the front
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5、 ... and 、jQuery How to modify the attributes of an element

jQuery Provides a variety of methods to modify the attributes of an element :

// Add, delete, modify and query tag attributes
$('#div').attr('class') // check
$('#div').attr('class','red') // Add and change ; If it exists, it is a modification , If it doesn't exist, add
$('#div').removeAttr('class') // Delete
//class Addition and deletion of
$('#div').addClass('red') // increase
$('#div').removeClass('red') // Delete
// Get the contents of the input box
$('input[name="username"]').val()
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quote

  1. jQuery Design implementation
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