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遍历jquery对象的代码分享

发布时间：2013-06-11   编辑：www.jquerycn.cn
今天遇到一个问题需要获取tagName，使用jquery，查询了一下，大家说用$("dd").attr("tagName")能获取到，但是得到的返回值是undefined，于是又查询饿了许久，返回遍历了一下jquery封装的对象
今天遇到一个问题需要获取tagName，使用jquery，查询了一下，大家说用$("dd").attr("tagName")能获取到，但是得到的返回值是undefined，于是又查询饿了许久，返回遍历了一下jquery封装的对象
复制代码 代码如下:

$("dd").bind("click",function(e){
var $obj = $(e.target);
var i=0;
for (var x in $obj){
i++;
var $hr=(i%5==0) ? "<hr />" : " ";
document.write(x+" "+$hr);
}
});

遍历结果：
0 length prevObject context selector
--------------------------------------------------------------------------------
constructor init jquery size toArray
--------------------------------------------------------------------------------
get pushStack each ready eq
--------------------------------------------------------------------------------
first last slice map end
--------------------------------------------------------------------------------
push sort splice extend data
--------------------------------------------------------------------------------
removeData queue dequeue delay clearQueue
--------------------------------------------------------------------------------
promise attr removeAttr prop removeProp
--------------------------------------------------------------------------------
addClass removeClass toggleClass hasClass val
--------------------------------------------------------------------------------
bind one unbind delegate undelegate
--------------------------------------------------------------------------------
trigger triggerHandler toggle hover live
--------------------------------------------------------------------------------
die blur focus focusin focusout
--------------------------------------------------------------------------------
load resize scroll unload click
--------------------------------------------------------------------------------
dblclick mousedown mouseup mousemove mouseover
--------------------------------------------------------------------------------
mouseout mouseenter mouseleave change select
--------------------------------------------------------------------------------
submit keydown keypress keyup error
--------------------------------------------------------------------------------
find has not filter is
--------------------------------------------------------------------------------
closest index add andSelf parent
--------------------------------------------------------------------------------
parents parentsUntil next prev nextAll
--------------------------------------------------------------------------------
prevAll nextUntil prevUntil siblings children
--------------------------------------------------------------------------------
contents text wrapAll wrapInner wrap
--------------------------------------------------------------------------------
unwrap append prepend before after
--------------------------------------------------------------------------------
remove empty clone html replaceWith
--------------------------------------------------------------------------------
detach domManip appendTo prependTo insertBefore
--------------------------------------------------------------------------------
insertAfter replaceAll css serialize serializeArray
--------------------------------------------------------------------------------
ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess
--------------------------------------------------------------------------------
ajaxSend show hide _toggle fadeTo
--------------------------------------------------------------------------------
animate stop slideDown slideUp slideToggle
--------------------------------------------------------------------------------
fadeIn fadeOut fadeToggle offset position
--------------------------------------------------------------------------------
offsetParent scrollLeft scrollTop innerHeight outerHeight
--------------------------------------------------------------------------------
height innerWidth outerWidth width
再遍历：
复制代码 代码如下:

$("dd").bind("click",function(e){
var $obj = $(e.target);
var i=0;
for (var x in $obj[0]){
i++;
var $hr=(i%5==0) ? "<hr />" : " ";
document.write(x+" "+$hr);
}
});

遍历结果：
querySelector querySelectorAll scrollTop scrollLeft scrollHeight
--------------------------------------------------------------------------------
scrollWidth clientTop clientLeft clientHeight clientWidth
--------------------------------------------------------------------------------
firstElementChild lastElementChild previousElementSibling nextElementSibling childElementCount
--------------------------------------------------------------------------------
children classList setCapture getElementsByClassName getClientRects
--------------------------------------------------------------------------------
getBoundingClientRect releaseCapture mozMatchesSelector addEventListener removeEventListener
--------------------------------------------------------------------------------
dispatchEvent style contentEditable isContentEditable offsetParent
--------------------------------------------------------------------------------
innerHTML offsetLeft offsetTop offsetHeight offsetWidth
--------------------------------------------------------------------------------
scrollIntoView id title lang dir
--------------------------------------------------------------------------------
className accessKey blur focus click
--------------------------------------------------------------------------------
tagName removeAttributeNS removeAttribute getAttribute getElementsByTagName
--------------------------------------------------------------------------------
setAttribute getElementsByTagNameNS hasAttributeNS setAttributeNS hasAttribute
--------------------------------------------------------------------------------
getAttributeNS nodeName nodeValue nodeType parentNode
--------------------------------------------------------------------------------
childNodes firstChild lastChild previousSibling nextSibling
--------------------------------------------------------------------------------
attributes ownerDocument namespaceURI prefix localName
--------------------------------------------------------------------------------
baseURI textContent setUserData getUserData insertBefore
--------------------------------------------------------------------------------
replaceChild removeChild appendChild hasChildNodes cloneNode
--------------------------------------------------------------------------------
normalize isSupported hasAttributes compareDocumentPosition isSameNode
--------------------------------------------------------------------------------
lookupPrefix isDefaultNamespace lookupNamespaceURI isEqualNode getAttributeNode
--------------------------------------------------------------------------------
setAttributeNode removeAttributeNode getAttributeNodeNS setAttributeNodeNS ELEMENT_NODE
--------------------------------------------------------------------------------
ATTRIBUTE_NODE TEXT_NODE CDATA_SECTION_NODE ENTITY_REFERENCE_NODE ENTITY_NODE
--------------------------------------------------------------------------------
PROCESSING_INSTRUCTION_NODE COMMENT_NODE DOCUMENT_NODE DOCUMENT_TYPE_NODE DOCUMENT_FRAGMENT_NODE
--------------------------------------------------------------------------------
NOTATION_NODE DOCUMENT_POSITION_DISCONNECTED DOCUMENT_POSITION_PRECEDING DOCUMENT_POSITION_FOLLOWING DOCUMENT_POSITION_CONTAINS
--------------------------------------------------------------------------------
DOCUMENT_POSITION_CONTAINED_BY DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC hidden tabIndex draggable
--------------------------------------------------------------------------------
spellcheck dataset
于是用$("dd")[0].tagName 可以获得tagName.
参考：http://www.mkyong.com/jquery/jquery-how-to-get-the-tag-name/
然后与$("a")遍历的结果对比
复制代码 代码如下:

$("a").bind("click",function(e){
var $obj = $(e.target);
var i=0;
for (var x in $obj){
i++;
var $hr=(i%5==0) ? "<hr />" : " ";
document.write(x+" "+$hr);
}
});

遍历结果：
0 context length constructor init
--------------------------------------------------------------------------------
selector jquery size toArray get
--------------------------------------------------------------------------------
pushStack each ready eq first
--------------------------------------------------------------------------------
last slice map end push
--------------------------------------------------------------------------------
sort splice extend data removeData
--------------------------------------------------------------------------------
queue dequeue delay clearQueue promise
--------------------------------------------------------------------------------
attr removeAttr prop removeProp addClass
--------------------------------------------------------------------------------
removeClass toggleClass hasClass val bind
--------------------------------------------------------------------------------
one unbind delegate undelegate trigger
--------------------------------------------------------------------------------
triggerHandler toggle hover live die
--------------------------------------------------------------------------------
blur focus focusin focusout load
--------------------------------------------------------------------------------
resize scroll unload click dblclick
--------------------------------------------------------------------------------
mousedown mouseup mousemove mouseover mouseout
--------------------------------------------------------------------------------
mouseenter mouseleave change select submit
--------------------------------------------------------------------------------
keydown keypress keyup error find
--------------------------------------------------------------------------------
has not filter is closest
--------------------------------------------------------------------------------
index add andSelf parent parents
--------------------------------------------------------------------------------
parentsUntil next prev nextAll prevAll
--------------------------------------------------------------------------------
nextUntil prevUntil siblings children contents
--------------------------------------------------------------------------------
text wrapAll wrapInner wrap unwrap
--------------------------------------------------------------------------------
append prepend before after remove
--------------------------------------------------------------------------------
empty clone html replaceWith detach
--------------------------------------------------------------------------------
domManip appendTo prependTo insertBefore insertAfter
--------------------------------------------------------------------------------
replaceAll css serialize serializeArray ajaxStart
--------------------------------------------------------------------------------
ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend
--------------------------------------------------------------------------------
show hide _toggle fadeTo animate
--------------------------------------------------------------------------------
stop slideDown slideUp slideToggle fadeIn
--------------------------------------------------------------------------------
fadeOut fadeToggle offset position offsetParent
--------------------------------------------------------------------------------
scrollLeft scrollTop innerHeight outerHeight height
--------------------------------------------------------------------------------
innerWidth outerWidth width

再遍历：
复制代码 代码如下:

$("a").bind("click",function(e){
var $obj = $(e.target);
var i=0;
for (var x in $obj[0]){
i++;
var $hr=(i%5==0) ? "<hr />" : " ";
document.write(x+" "+$hr);
}
});

遍历结果：
jQuery16407028609993839658 querySelector querySelectorAll scrollTop scrollLeft
--------------------------------------------------------------------------------
scrollHeight scrollWidth clientTop clientLeft clientHeight
--------------------------------------------------------------------------------
clientWidth firstElementChild lastElementChild previousElementSibling nextElementSibling
--------------------------------------------------------------------------------
childElementCount children classList setCapture getElementsByClassName
--------------------------------------------------------------------------------
getClientRects getBoundingClientRect releaseCapture mozMatchesSelector addEventListener
--------------------------------------------------------------------------------
removeEventListener dispatchEvent style contentEditable isContentEditable
--------------------------------------------------------------------------------
offsetParent innerHTML offsetLeft offsetTop offsetHeight
--------------------------------------------------------------------------------
offsetWidth scrollIntoView href rel target
--------------------------------------------------------------------------------
name text search hash id
--------------------------------------------------------------------------------
title lang dir className accessKey
--------------------------------------------------------------------------------
blur focus click tagName removeAttributeNS
--------------------------------------------------------------------------------
removeAttribute getAttribute getElementsByTagName setAttribute getElementsByTagNameNS
--------------------------------------------------------------------------------
hasAttributeNS setAttributeNS hasAttribute getAttributeNS nodeName
--------------------------------------------------------------------------------
nodeValue nodeType parentNode childNodes firstChild
--------------------------------------------------------------------------------
lastChild previousSibling nextSibling attributes ownerDocument
--------------------------------------------------------------------------------
namespaceURI prefix localName baseURI textContent
--------------------------------------------------------------------------------
setUserData getUserData insertBefore replaceChild removeChild
--------------------------------------------------------------------------------
appendChild hasChildNodes cloneNode normalize isSupported
--------------------------------------------------------------------------------
hasAttributes compareDocumentPosition isSameNode lookupPrefix isDefaultNamespace
--------------------------------------------------------------------------------
lookupNamespaceURI isEqualNode tabIndex ELEMENT_NODE ATTRIBUTE_NODE
--------------------------------------------------------------------------------
TEXT_NODE CDATA_SECTION_NODE ENTITY_REFERENCE_NODE ENTITY_NODE PROCESSING_INSTRUCTION_NODE
--------------------------------------------------------------------------------
COMMENT_NODE DOCUMENT_NODE DOCUMENT_TYPE_NODE DOCUMENT_FRAGMENT_NODE NOTATION_NODE
--------------------------------------------------------------------------------
DOCUMENT_POSITION_DISCONNECTED DOCUMENT_POSITION_PRECEDING DOCUMENT_POSITION_FOLLOWING DOCUMENT_POSITION_CONTAINS DOCUMENT_POSITION_CONTAINED_BY
--------------------------------------------------------------------------------
DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC getAttributeNode setAttributeNode removeAttributeNode getAttributeNodeNS
--------------------------------------------------------------------------------
setAttributeNodeNS ping hreflang type protocol
--------------------------------------------------------------------------------
host hostname port pathname charset
--------------------------------------------------------------------------------
coords rev shape hidden draggable
--------------------------------------------------------------------------------
spellcheck dataset
jQuery Get Tag Name
复制代码 代码如下:

<html>
<head>
<title>jQuery Get Tag Name</title>
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
</head>
<script type="text/javascript">
$(document).ready(function(){

var $tag = $('p')[0].tagName; //'P'
alert($tag);

var $tag = $('.classTag1')[0].tagName; //'DIV'
alert($tag);

var $tag = $('#idTag1')[0].tagName; //'DIV'
alert($tag);

var $tag = $('p').get(0).tagName; //'P'
alert($tag);

var $tag = $('.classTag1').get(0).tagName; //'DIV'
alert($tag);

var $tag = $('#idTag1').get(0).tagName; //'DIV'
alert($tag);

});
</script>
<body>
<h1>jQuery Get Tag Name</h1>
<p>
This is paragrah 1
</p>

<div class="classTag1">
This is class='classTag1'
</div>

<div id="idTag1">
This is id='idTag1'
</div>
</body>
</html>

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