jQuery - Functions

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Functions are the basic unit of action in jQuery. 

a function is made up of three parts:

• the function keyworld
• any inputs that funciton takes
• whatever actions the function should perform

$(document).ready(function(){

});

$(document) is jQuery object. The$() is actually a function in disguise; it turns the document into a jQuery object.

.ready() is a type of function; you can think of it as sort of a helper that runs the code inside its parentheses as soon as the HTML document is ready.

function(){} is the action that.ready() will perform as soon as the HTML document is loaded.

jQuery - Functions

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原文地址：http://www.cnblogs.com/elewei/p/5721168.html