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() {
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jQuery("img.lazy").lazy({
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delay: 2000
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});
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});
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预先载入图像01
(function($) {
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var cache = [];
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// Arguments are image paths relative to the current page.
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$.PReLoadImages = function() {
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var args_len = arguments.length;
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for (var i = args_len; i--;) {
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var cacheImage = document.createElement('img');
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cacheImage.src = arguments[i];
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cache.push(cacheImage);
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}
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}
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})(jQuery)
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部分页面刷新1
setInterval(function() {
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$("#refresh").load(location.href+" #refresh>*","");
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}, 10000);
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延迟动画/效果1
$(".alert").delay(2000).fadeOut();
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Open external link in New Window01
$('a').each(function() {
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var a = new RegExp('/' + window.location.host + '/');
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if(!a.test(this.href)) {
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$(this).click(function(event) {
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event.preventDefault();
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event.stopPropagation();
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window.open(this.href, '_blank');
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});
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}
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});
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Make Everything Mobile Friendly01
var scr = document.createElement('script');
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scr.setAttribute('src', 'https://Ajax.googleapis.com/ajax/libs/jquery/1.5.2/
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jquery.min.js');
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document.body.appendChild(scr);
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scr.onload = function(){
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$('div').attr('class', '').attr('id', '').CSS({
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'margin' : 0,
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'padding' : 0,
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'width': '100%',
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'clear':'both'
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});
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};
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Image Resize Using jQuery01
$(window).bind("load", function() {
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// IMAGE RESIZE
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$('#product_cat_list img').each(function() {
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var maxWidth = 120;
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var maxHeight = 120;
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var ratio = 0;
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var width = $(this).width();
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var height = $(this).height();
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if(width > maxWidth){
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ratio = maxWidth / width;
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$(this).css("width", maxWidth);
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$(this).css("height", height * ratio);
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height = height * ratio;
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}
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var width = $(this).width();
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var height = $(this).height();
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if(height > maxHeight){
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ratio = maxHeight / height;
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$(this).css("height", maxHeight);
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$(this).css("width", width * ratio);
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width = width * ratio;
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}
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});
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//$("#contentpage img").show();
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// IMAGE RESIZE
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});
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Smooth Scrolling01
$(function() {
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$('a[href*=#]:not([href=#])').click(function() {
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if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
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&& location.hostname == this.hostname) {
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var target = $(this.hash);
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target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
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if (target.length) {
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$('html,body').animate({
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scrollTop: target.offset().top
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}, 1000);
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return false;
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}
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}
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});
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});
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Window load event with minimum delay01
(function fn() {
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fn.now = +new Date;
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$(window).load(function() {
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if (+new Date - fn.now < 500) setTimeout(fn, 500);
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// Do something
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});
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})();
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jQuery Accordion01
(function($) {
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var allPanels = $('.accordion > dd').hide();
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$('.accordion > dt > a').click(function() {
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allPanels.slideUp();
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$(this).parent().next().slideDown();
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return false;
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});
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})(jQuery);
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Simple Auto-Playing Slideshow01
$("#slideshow > div:gt(0)").hide();
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setInterval(function() {
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$('#slideshow > div:first')
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.fadeOut(1000)
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.next()
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.fadeIn(1000)
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.end()
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.appendTo('#slideshow');
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}, 3000);
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Shuffle DOM Elements01
(function($){
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$.fn.shuffle = function() {
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var allElems = this.get(),
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getRandom = function(max) {
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return Math.floor(Math.random() * max);
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},
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shuffled = $.map(allElems, function(){
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var random = getRandom(allElems.length),
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randEl = $(allElems[random]).clone(true)[0];
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allElems.splice(random, 1);
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return randEl;
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});
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this.each(function(i){
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$(this).replaceWith($(shuffled[i]));
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});
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return $(shuffled);
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};
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})(jQuery);
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Scroll Page Horizontally With Mouse Wheel01
$(function() {
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$("body").mousewheel(function(event, delta) {
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this.scrollLeft -= (delta * 30);
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event.preventDefault();
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});
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});
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Load Only a Section of a Page1
$("#mainNav").load("/store #mainNav")
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Highlight Related Label when Input in Focus1
$("form :input").focus(function() {
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$("label[for='" + this.id + "']").addClass("labelfocus");
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}).blur(function() {
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$("label").removeClass("labelfocus");
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});
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Highlight All Links To Current Page1
$(function(){
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$("a").each(function(){
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if ($(this).attr("href") == window.location.pathname){
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$(this).addClass("selected");
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}
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});
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});
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Better Broken Image Handling1
// Replace source
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$('img').error(function(){
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$(this).attr('src', 'missing.png');
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});
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// Or, hide them
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$("img").error(function(){
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$(this).hide();
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});
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Load Content on Scroll Automatically01
var loading = false;
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$(window).scroll(function(){
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if((($(window).scrollTop()+$(window).height())+250)>=$(document).
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height()){
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if(loading == false){
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loading = true;
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$('#loadingbar').css("display","block");
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$.get("load.php?start="+$('#loaded_max').val(),
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function(loaded){
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$('body').append(loaded);
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$('#loaded_max').val(parseInt($('#loaded_max')
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.val())+50);
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$('#loadingbar').css("display","none");
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loading = false;
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});
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}
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}
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});
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$(document).ready(function() {
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$('#loaded_max').val(50);
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});
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Prevent Multiple Submit of Your Form01
$(document).ready(function() {
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$('form').submit(function() {
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if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {
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jQuery.data(this, "disabledOnSubmit", { submited: true });
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$('input[type=submit], input[type=button]', this).each(function() {
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$(this).attr("disabled", "disabled");
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});
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return true;
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}
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else
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{
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return false;
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}
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});
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});
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Make Entire Div Clickable1
$(".myBox").click(function(){
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window.location=$(this).find("a").attr("href");
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return false;
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});
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Toggle Text1
$("#more-less-options-button").click(function() {
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var txt = $("#extra-options").is(':visible') ? 'more options': 'less
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options';
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$("#more-less-options-button").text(txt);
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$("#extra-options").slideToggle();
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});
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