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jquery的extend方法

2016-04-26 09:39 501 查看

DifferencebetweenjQuery.extendandjQuery.fn.extend?

一遇到extend或写插件的时候我总是翻几个这样的文章看，终于在stackoverflow上找到了一个很棒的答案。

Actually,thereisnoneapartfromtheirbasereference.InthejQuerysource,youcanread:

jQuery.extend=jQuery.fn.extend=function(){…};

Sohowdoesitwork?Thedocumentationreads:

Mergesthecontentsoftwoormoreobjectstogetherintothefirstobject.

It'sjustafor-in-loopthatcopiesproperties,pimpedupwithaflagtorecursenestedobjects.Andanotherfeature:

Ifonlyoneargumentissuppliedto

$.extend()

,thismeansthetargetargumentwasomitted

//thenthefollowingwillhappen:
target=this;

Soifthefunctioniscalledon

jQuery

itself(withoutexplicittarget),itwillextendthejQuerynamespace.
Andifthefunctioniscalledon

jQuery.fn

(withoutexplicittarget),itwillextendthejQueryprototypeobjectwhereallthe(plugin)methodsarelocated.[/code]

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