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：
$("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：
$("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
$("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：
$("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
