jQuery已经成为任何web项目的重要组成部分。它为网站提供了交互性的通过移动HTML元素，创建自定义动画，处理事件，选择DOM元素，检索整个document ，让最终用户有一个更好的体验。

在这篇文章中我已经收集了20 +个可重复使用的jQuery代码片段，你可以很容易地复制并直接粘贴到你的项目中。

图片的延迟加载

1	jQuery(document).ready(function() {

2	jQuery("img.lazy").lazy({

3	delay: 2000

4

});

5

});

Source

预先载入图像

01	(function($) {

02	var cache = [];

03	// Arguments are image paths relative to the current page.

04	$.PReLoadImages = function() {

05	var args_len = arguments.length;

06	for (var i = args_len; i--;) {

07	var cacheImage = document.createElement('img');

08	cacheImage.src = arguments[i];

09	cache.push(cacheImage);

10

}

11

}

12	})(jQuery)

Source

部分页面刷新

1	setInterval(function() {

2	$("#refresh").load(location.href+" #refresh>*","");

3	}, 10000);

Source

延迟动画/效果

1	$(".alert").delay(2000).fadeOut();

Source

Open external link in New Window

01	$('a').each(function() {

02	var a = new RegExp('/' + window.location.host + '/');

03	if(!a.test(this.href)) {

04	$(this).click(function(event) {

05	event.preventDefault();

06	event.stopPropagation();

07	window.open(this.href, '_blank');

08

});

09

}

10

});

Source

Make Everything Mobile Friendly

01	var scr = document.createElement('script');

02	scr.setAttribute('src', 'https://Ajax.googleapis.com/ajax/libs/jquery/1.5.2/

03	jquery.min.js');

04	document.body.appendChild(scr);

05

06	scr.onload = function(){

07

08	$('div').attr('class', '').attr('id', '').CSS({

09	'margin' : 0,

10	'padding' : 0,

11	'width': '100%',

12	'clear':'both'

13

});

14

};

Source

Image Resize Using jQuery

01	$(window).bind("load", function() {

02	// IMAGE RESIZE

03	$('#product_cat_list img').each(function() {

04	var maxWidth = 120;

05	var maxHeight = 120;

06	var ratio = 0;

07	var width = $(this).width();

08	var height = $(this).height();

09

10	if(width > maxWidth){

11	ratio = maxWidth / width;

12	$(this).css("width", maxWidth);

13	$(this).css("height", height * ratio);

14	height = height * ratio;

15

}

16	var width = $(this).width();

17	var height = $(this).height();

18	if(height > maxHeight){

19	ratio = maxHeight / height;

20	$(this).css("height", maxHeight);

21	$(this).css("width", width * ratio);

22	width = width * ratio;

23

}

24

});

25	//$("#contentpage img").show();

26	// IMAGE RESIZE

27

});

Source

Smooth Scrolling

01	$(function() {

02	$('a[href*=#]:not([href=#])').click(function() {

03	if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')

04	&& location.hostname == this.hostname) {

05	var target = $(this.hash);

06	target = target.length ? target : $('[name=' + this.hash.slice(1) +']');

07	if (target.length) {

08	$('html,body').animate({

09	scrollTop: target.offset().top

10

}, 1000);

11	return false;

12

}

13

}

14

});

15

});

Source

Window load event with minimum delay

01	(function fn() {

02

03	fn.now = +new Date;

04

05	$(window).load(function() {

06

07	if (+new Date - fn.now < 500) setTimeout(fn, 500);

08

09	// Do something

10

11

});

12

13

})();

Source

jQuery Accordion

01	(function($) {

02

03	var allPanels = $('.accordion > dd').hide();

04

05	$('.accordion > dt > a').click(function() {

06	allPanels.slideUp();

07	$(this).parent().next().slideDown();

08	return false;

09

});

10

11	})(jQuery);

Source

Simple Auto-Playing Slideshow

01	$("#slideshow > div:gt(0)").hide();

02

03	setInterval(function() {

04	$('#slideshow > div:first')

05	.fadeOut(1000)

06

.next()

07	.fadeIn(1000)

08

.end()

09	.appendTo('#slideshow');

10	},  3000);

Source

Shuffle DOM Elements

01	(function($){

02

03	$.fn.shuffle = function() {

04

05	var allElems = this.get(),

06	getRandom = function(max) {

07	return Math.floor(Math.random() * max);

08

},

09	shuffled = $.map(allElems, function(){

10	var random = getRandom(allElems.length),

11	randEl = $(allElems[random]).clone(true)[0];

12	allElems.splice(random, 1);

13	return randEl;

14

});

15

16	this.each(function(i){

17	$(this).replaceWith($(shuffled[i]));

18

});

19

20	return $(shuffled);

21

22

};

23

24	})(jQuery);

Source

Scroll Page Horizontally With Mouse Wheel

01	$(function() {

02

03	$("body").mousewheel(function(event, delta) {

04

05	this.scrollLeft -= (delta * 30);

06

07	event.preventDefault();

08

09

});

10

11

});

Source

Load Only a Section of a Page

1	$("#mainNav").load("/store #mainNav")

Source

Highlight Related Label when Input in Focus

1	$("form :input").focus(function() {

2	$("label[for='" + this.id + "']").addClass("labelfocus");

3	}).blur(function() {

4	$("label").removeClass("labelfocus");

5

});

Source

Highlight All Links To Current Page

1	$(function(){

2	$("a").each(function(){

3	if ($(this).attr("href") == window.location.pathname){

4	$(this).addClass("selected");

5

}

6

});

7

});

Source

Better Broken Image Handling

1	// Replace source

2	$('img').error(function(){

3	$(this).attr('src', 'missing.png');

4

});

5

6	// Or, hide them

7	$("img").error(function(){

8	$(this).hide();

9

});

Source

Load Content on Scroll Automatically

01	var loading = false;

02	$(window).scroll(function(){

03	if((($(window).scrollTop()+$(window).height())+250)>=$(document).

04	height()){

05	if(loading == false){

06	loading = true;

07	$('#loadingbar').css("display","block");

08	$.get("load.php?start="+$('#loaded_max').val(),

09	function(loaded){

10	$('body').append(loaded);

11	$('#loaded_max').val(parseInt($('#loaded_max')

12	.val())+50);

13	$('#loadingbar').css("display","none");

14	loading = false;

15

});

16

}

17

}

18

});

19

20	$(document).ready(function() {

21	$('#loaded_max').val(50);

22

});

Source

Prevent Multiple Submit of Your Form

01	$(document).ready(function() {

02	$('form').submit(function() {

03	if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {

04	jQuery.data(this, "disabledOnSubmit", { submited: true });

05	$('input[type=submit], input[type=button]', this).each(function() {

06	$(this).attr("disabled", "disabled");

07

});

08	return true;

09

}

10

else

11

{

12	return false;

13

}

14

});

15

});

Source

Make Entire Div Clickable

1	$(".myBox").click(function(){

2	window.location=$(this).find("a").attr("href");

3	return false;

4

});

Source

Toggle Text

1	$("#more-less-options-button").click(function() {

2	var txt = $("#extra-options").is(':visible') ? 'more options': 'less

3

options';

4	$("#more-less-options-button").text(txt);

5	$("#extra-options").slideToggle();

6

});

Source