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what's the meaning of the way of writing in jquery?
$.each(obj,function(key,value) {})

$('document').ready(function(){}); or     $(function(){});

function myFunction() {
   alert("This is myFunction");
}

myFunction();      // alerts "This is myFunction"

myFunction.someProperty = "test";
alert(myFunction.someProperty);    // alerts "test"

myFunction.someMethod = function() {
                          alert("This is someMethod");
                        };

myFunction.someMethod();    // alerts "This is someMethod"

$(function(){});
// is equivalent to my example
myFunction();

$.each();
// is equivalent to my example
myFunction.someMethod();

$(document)
// returns a jQuery object that has a "ready" method so you can say
$(document).ready();
// which is equivalent to
var doc = $(document);
doc.ready();

$('div').hide().fadeIn().fadeOut().show();

$('a')

$.each(...)

$('a').hide();