.filter(":not(:has(.selected))") //去掉所有不包含class为.selected的元素

var allItems = $("div.item"); 
var keepList = $("div#container1 div.item"); 
<div>class names: 
$(formToLookAt + " input:checked").each(function() {  keepListkeepList = keepList.filter("." + $(this).attr("name")); });
</div>

//jQuery 1.4.* includes support for the has method. This method will find 
//if a an element contains a certain other element class or whatever it is 
//you are looking for and do anything you want to them. 
$("input").has(".email").addClass("email_icon");

//Look for the media-type you wish to switch then set the href to your new style sheet 
$('link[media='screen']').attr('href', 'Alternative.css'); 

//Where possible, pre-fix your class names with a tag name 
//so that jQuery doesn't have to spend more time searching 
//for the element you're after. Also remember that anything 
//you can do to be more specific about where the element is 
//on your page will cut down on execution/search times 
var in_stock = $('#shopping_cart_items input.is_in_stock');

<ul id="shopping_cart_items"> 
<li> 
<input value="Item-X" name="item" class="is_in_stock" type="radio"> Item X</li> 
<li> 
<input value="Item-Y" name="item" class="3-5_days" type="radio"> Item Y</li> 
<li> 
<input value="Item-Z" name="item" class="unknown" type="radio"> Item Z</li> 
</ul> 

//Toggle class allows you to add or remove a class 
//from an element depending on the presence of that 
//class. Where some developers would use: 
a.hasClass('blueButton') "brush:js;">
if ($.browser.msie) { // Internet Explorer is a sadist. } 

$('#thatdiv').replaceWith('fnuh');

if ($('#keks').html()) { //Nothing found ;} 

$("ul > li").click(function () { 
 var index = $(this).prevAll().length; 
});

$('#foo').bind('click', function() { 
 alert('User clicked on "foo."'); 
}); 

$('#lal').append('sometext');

var e = $("", { href: "#", class: "a-class another-class", title: "..." });

//This precision-based approached can be useful when you use 
//lots of similar input elements which have different types 
var elements = $('#someid input[type=sometype][value=somevalue]').get(); 

jQuery.preloadImages = function() { for(var i = 0; i').attr('src', arguments[i]); } }; 
// Usage $.preloadImages('image1.gif', '/path/to/image2.png', 'some/image3.jpg'); 

$('button.someClass').live('click', someFunction);
 //Note that in jQuery 1.4.2, the delegate and undelegate options have been
 //introduced to replace live as they offer better support for context
 //For example, in terms of a table where before you would use..
 // .live()
 $("table").each(function(){
 $("td", this).live("hover", function(){
 $(this).toggleClass("hover");
 });
 });
 //Now use..
 $("table").delegate("td", "hover", function(){
 $(this).toggleClass("hover");
});

$('#someElement').find('option:selected');

$("p.value:contains('thetextvalue')").hide();

jQuery.fn.autoscroll = function(selector) {
 $('html,body').animate(
 {scrollTop: $(selector).offset().top},
 500
 );
}
//Then to scroll to the class/area you wish to get to like this:
$('.area_name').autoscroll();

Detect Safari (if( $.browser.safari)),
Detect IE6 and over (if ($.browser.msie && $.browser.version > 6 )),
Detect IE6 and below (if ($.browser.msie && $.browser.version <= 6 )),
Detect FireFox 2 and above (if ($.browser.mozilla && $.browser.version >= '1.8' ))

var el = $('#id');
el.html(el.html().replace(/word/ig, ''));

$(document).bind('contextmenu',function(e){ return false; });

$.expr[':'].mycustomselector = function(element, index, meta, stack){
// element- is a DOM element
// index - the current loop index in stack
// meta - meta data about your selector
// stack - stack of all elements to loop
// Return true to include current element
// Return false to explude current element
};
// Custom Selector usage:
$('.someClasses:test').doSomething();

if ($('#someDiv').length) {//hooray!!! it exists...}

$("#someelement").live('click', function(e) {
 if( (!$.browser.msie && e.button == 0) || ($.browser.msie && e.button == 1) ) {
  alert("Left Mouse Button Clicked");
 }
 else if(e.button == 2)
  alert("Right Mouse Button Clicked");
});

//This snippet will show you how to keep a default value
//in a text input field for when a user hasn't entered in
//a value to replace it
swap_val = [];
$(".swap").each(function(i){
 swap_val[i] = $(this).val();
 $(this).focusin(function(){
  if ($(this).val() == swap_val[i]) {
   $(this).val("");
  }
 }).focusout(function(){
  if ($.trim($(this).val()) == "") {
   $(this).val(swap_val[i]);
  }
 });
});

<INPUT class=swap value="Enter Username here.." type=text> 

//Here's how we used to do it in 1.3.2 using setTimeout
setTimeout(function() {
 $('.mydiv').hide('blind', {}, 500)
}, 5000);
//And here's how you can do it with 1.4 using the delay() feature (this is a lot like sleep)
$(".mydiv").delay(5000).hide('blind', {}, 500);

var newgbin1Div = $('');
newgbin1Div.attr('id','gbin1.com').appendTo('body');

jQuery.fn.maxLength = function(max){
 this.each(function(){
 var type = this.tagName.toLowerCase();
 var inputType = this.type"input" && inputType == "text" || inputType == "password"){
  //Apply the standard maxLength
  this.maxLength = max;
 }
 else if(type == "textarea"){
  this.onkeypress = function(e){
  var ob = e || event;
  var keyCode = ob.keyCode;
  var hasSelection = document.selection"brush:js;">
//Separate tests into modules.
module("Module B");
test("some other gbin1.com test", function() {
 //Specify how many assertions are expected to run within a test.
 expect(2);
 //A comparison assertion, equivalent to JUnit's assertEquals.
 equals( true, false, "failing test" );
 equals( true, true, "passing test" );
});

var cloned = $('#gbin1div').clone();

if($(element).is(':visible') == 'true') { //The element is Visible }

jQuery.fn.center = function () {
 this.css('position','absolute');
 this.css('top', ( $(window).height() - this.height() ) / +$(window).scrollTop() + 'px');
 this.css('left', ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + 'px');return this;
}
//Use the above function as: $('#gbin1div').center();

var arrInputValues = new Array();
$("input[name='table[]']").each(function(){
  arrInputValues.push($(this).val());
});

(function($) {
 $.fn.stripHtml = function() {
  var regexp = /<("[^"]*"|'[^']*'|[^'">])*>/gi;
  this.each(function() {
   $(this).html(
    $(this).html().replace(regexp,"")
   );
  });
  return $(this);
 }
})(jQuery);
//usage:
$('p').stripHtml();

$('#searchBox').closest('div');

// Allows chainable logging
// Usage: $('#someDiv').hide().log('div hidden').addClass('someClass');
jQuery.log = jQuery.fn.log = function (msg) {
  if (console){
   console.log("%s: %o", msg, this);
  }
  return this;
};

jQuery('a.popup').live('click', function(){
 newwindow=window.open($(this).attr('href'),'','height=200,width=150');
 if (window.focus) {newwindow.focus()}
 return false;
});

jQuery('a.newTab').live('click', function(){
 newwindow=window.open($(this).href);
 jQuery(this).target = "_blank";
 return false;
});

// Rather than doing this
$('#nav li').click(function(){
 $('#nav li').removeClass('active');
 $(this).addClass('active');
});
// Do this instead
$('#nav li').click(function(){
 $(this).addClass('active')
  .siblings().removeClass('active');
});

var tog = false; // or true if they are checked on load
$('a').click(function() {
 $("input[type=checkbox]").attr("checked",!tog);
 tog = !tog;
});

//If the value of the element matches that of the entered text
//it will be returned
$('.gbin1Class').filter(function() {
 return $(this).attr('value') == $('input#gbin1Id').val() ;
 })

$(document).mousemove(function(e){
$(document).ready(function() {
$().mousemove(function(e){
$('#XY').html("Gbin1 X Axis : " + e.pageX + " | Gbin1 Y Axis " + e.pageY);
});
});

$("ul li").click(function(){
 window.location=$(this).find("a").attr("href"); return false;
});

<UL>
<LI><A href="#">GBin1 Link 1</A></LI>
<LI><A href="#">GBin1 Link 2</A></LI>
<LI><A href="#">GBin1 Link 3</A></LI>
<LI><A href="#">GBin1 Link 4</A></LI>
</UL> 

function parseXml(xml) {
 //find every Tutorial and print the author
 $(xml).find("Tutorial").each(function()
 {
 $("#output").append($(this).attr("author") + "");
 });
}

$('#theGBin1Image').attr('src', 'image.jpg').load(function() {
alert('This Image Has Been Loaded');
});

//Events can be namespaced like this
$('input').bind('blur.validation', function(e){
 // ...
});
//The data method also accept namespaces
$('input').data('validation.isValid', true);

var dt = new Date();
dt.setSeconds(dt.getSeconds() + 60);
document.cookie = "cookietest=1; expires=" + dt.toGMTString();
var cookiesEnabled = document.cookie.indexOf("cookietest=") != -1;
if(!cookiesEnabled)
{
 //cookies have not been enabled
}

var date = new Date();
date.setTime(date.getTime() + (x * 60 * 1000));
$.cookie('example', 'foo', { expires: date });

$.fn.replaceUrl = function() {
  var regexp = /((ftp|http|https)://(w+:{0,1}w*@)"$1">$1</A>')
   );
  });
  return $(this);
 }
//usage
$('#GBin1div').replaceUrl(); 

$("#form").keypress(function(e) {
 if (e.which == 13) {
 return false;
 }
});

function clearForm(form) {
 // iterate over all of the inputs for the form
 // element that was passed in
 $(':input', form).each(function() {
 var type = this.type;
 var tag = this.tagName.toLowerCase(); // normalize case
 // it's ok to reset the value attr of text inputs,
 // password inputs, and textareas
 if (type == 'text' || type == 'password' || tag == 'textarea')
  this.value = "";
 // checkboxes and radios need to have their checked state cleared
 // but should *not* have their 'value' changed
 else if (type == 'checkbox' || type == 'radio')
  this.checked = false;
 // select elements need to have their 'selectedIndex' property set to -1
 // (this works for both single and multiple select elements)
 else if (tag == 'select')
  this.selectedIndex = -1;
 });
};

$("#somebutton").attr("disabled", true);

$("#submit-button").removeAttr("disabled");

$('#username').keyup(function() {
 $('#submit').attr('disabled', !$('#username').val()); 
});

$(document).ready(function() {
 $('form').submit(function() {
 if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {
  jQuery.data(this, "disabledOnSubmit", { submited: true });
  $('input[type=submit], input[type=button]', this).each(function() {
  $(this).attr("disabled", "disabled");
  });
  return true;
 }
 else
 {
  return false;
 }
 });
});

$("form :input").focus(function() {
 $("label[for='" + this.id + "']").addClass("labelfocus");
}).blur(function() {
 $("label").removeClass("labelfocus");
});

//change event on password1 field to prompt new input
$('#password1').change(function() {
  //dynamically create new input and insert after password1
  $("#password1").append("<input type='text' name='password2' id='password2' />");
});

$(function(){
 $("select#ctlJob").change(function(){
 $.getJSON("/select.php",{id: $(this).val(), ajax: 'true'}, function(j){
  var options = '';
  for (var i = 0; i < j.length; i++) {
  options += '<option value="' + j[i].optionValue + '">' + j[i].optionDisplay + '</option>';
  }
  $("select#ctlPerson").html(options);
 })
 })
})

$('#checkBox').attr('checked');

$("#myform").submit();