jQuery review (Day01)

jQuery is a JavaScript library, which encapsulates JavaScript to facilitate the operation of programmers

$是一个全局的对象，代表jQuery
入口函数：$(document).ready(function(){
    
    
        ....
    })
    简写方式：$(function(){
    
    
        .....
    })

Selector

Class selector: $(" . C L A S S ") I D selected from the selection device : ($ "#id")
tag selector: $(" Standard sign name ") same time won to take more than one yuan Su :$ (1label, 2 labels, label 3 ...)

Level selector:

$(p a r e n t > c h i l d) - - - He is eligible to take the parent element element under the as has sub- element pixel immediately neighbor the same level element hormone :$ (PREV+ Next) - the next sibling of the current element immediately
sibling elements following: $(p r e v s u b l i n g s) - - - Eligible taken when the front element prime the rear of the have the same level membered element through the filter selected from the selection unit of a th element factors :$ (div:First) - Get a first selector element specifies the
last element: $(d i v : l a s t) - - - Eligible fetch refers to a given option selection is in the best after a th membered element index lead to an even number :$ (div:the even) - Get element specifies the selector even row
index is odd: $(d i v : o d d) - - - Eligible fetch refers to a given option selection is in an odd number of rows of element pixel index primers value :$ (:EQ (index)) - Gets the index value equal to the index of the element
is greater than the index: $(: g t (i n d e x)) - - - Eligible take index primers value large to I n- D E X is meta element smaller in index primers value :$ (:lt (index)) - Gets the index value is less than the index of the element
gain focus: $ (: focus) - find the current acquired focus element

Content selector:

$(: c o n t a i n s (t e x t)) - - - Is eligible to take the content package contains have T E X T text present in the element element, cases such as :$ ( "Li: the contains ( 'JS')")
$(: h a s (s e l e c t o r)) - - - He is eligible to take the content package comprising means specified option selection is the element element, cases such as$ ( "li: has ( 'aGet element li contains a label
$ (: parent) - Empty selection acquires the content is not is
$ (: empty) - Gets content is empty selector

Visibility selector:

$(: h i d d e n) - - - Eligible to take the have hidden hide yuan prime example such as :$ ( "the p-: hidden") to find all the hidden elements of P
$ (: visible) - Get all visible elements

Attribute selector:

$(div[attr])------Get the element with the specified attribute
$([attr!=value])------Get the element whose attribute value is not equal to value
$([attr=value]) ------Get the element whose attribute value is equal to value
$([attr^=value])------Get the element whose attribute value starts with value
$([a t t r$ =value])------Get the element whose attribute value ends with value
$([attr*=value])------Get the element whose attribute value contains value

Child element selector

$(:first-child)—Get the first child element
$(:last-child)—Get the last child element
$(:only-child)—Get the current element is the only child element

Form selector

$(:input)—Get all form elements, including select, textera
$(:text) —Get all text boxes
$(:password) —Get all password boxes
$(:radio) —Get all radio buttons
$(:enable)—Get all available form elements
$(:disable)—Get all unavailable form elements, the right one is radio, checkbox
$(:checked)—Get all selected form elements, the right one select

jQuery review (Day01)

Selector

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