可以直接拿来用的15个jQuery代码片段

开发人员利用jQuery代码不仅能给网站带来各种动画、特效，还会提高网站的用户体验。本文总结了开发者经常使用的15个jQuery代码片段，大家可以直接拿来用。

jQuery里提供了许多创建交互式网站的方法，在开发Web项目时，开发人员应该好好利用jQuery代码，它们不仅能给网站带来各种动画、特效，还会提高网站的用户体验。

本文收集了15段非常实用的jQuery代码片段，你可以直接复制黏贴到代码里，但请开发者注意了，要理解代码再使用哦。下面就让我们一起来享受jQuery代码的魅力之处吧。

1.预加载图片

123456789101112 (function($) {varcache = [];// Arguments are image paths relative to the current page.$.preLoadImages =function() {varargs_len = arguments.length;for(vari = args_len; i--;) {varcacheImage = document.createElement('img');cacheImage.src = arguments[i];cache.push(cacheImage);}}jQuery.preLoadImages("image1.gif","/path/to/image2.png");

源码

2. 让页面中的每个元素都适合在移动设备上展示

1234567891011 varscr = document.createElement('script');scr.setAttribute('src','https://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js');document.body.appendChild(scr);scr.onload =function(){$('div').attr('class','').attr('id','').css({'margin': 0,'padding': 0,'width':'100%','clear':'both'});};

源码

3.图像等比例缩放

1234567891011121314151617181920212223242526 $(window).bind("load",function() {// IMAGE RESIZE$('#product_cat_list img').each(function() {varmaxWidth = 120;varmaxHeight = 120;varratio = 0;varwidth = $(this).width();varheight = $(this).height();if(width > maxWidth){ratio = maxWidth / width;$(this).css("width", maxWidth);$(this).css("height", height * ratio);height = height * ratio;}varwidth = $(this).width();varheight = $(this).height();if(height > maxHeight){ratio = maxHeight / height;$(this).css("height", maxHeight);$(this).css("width", width * ratio);width = width * ratio;}});//$("#contentpage img").show();// IMAGE RESIZE});

源码

4.返回页面顶部

12345678 // Back To Top$(document).ready(function(){$('.top').click(function() {$(document).scrollTo(0,500);});});//Create a link defined with the class .top<a href="#"class="top">Back To Top</a>

源码

5.使用jQuery打造手风琴式的折叠效果

1234567891011121314151617181920212223 varaccordion = {init:function(){var$container = $('#accordion');$container.find('li:not(:first) .details').hide();$container.find('li:first').addClass('active');$container.on('click','li a',function(e){e.preventDefault();var$this= $(this).parents('li');if($this.hasClass('active')){if($('.details').is(':visible')) {$this.find('.details').slideUp();}else{$this.find('.details').slideDown();}}else{$container.find('li.active .details').slideUp();$container.find('li').removeClass('active');$this.addClass('active');$this.find('.details').slideDown();}});}};

6.通过预加载图片廊中的上一幅下一幅图片来模仿Facebook的图片展示方式

12345678 varnextimage ="/images/some-image.jpg";$(document).ready(function(){window.setTimeout(function(){varimg = $("").attr("src", nextimage).load(function(){//all done});}, 100);});

源码

7.使用jQuery和Ajax自动填充选择框

12345678910111213 $(function(){$("select#ctlJob").change(function(){$.getJSON("/select.php",{id: $(this).val(), ajax:'true'},function(j){varoptions ='';for(vari = 0; i < j.length; i++) {options +=''+ j[i].optionDisplay +'';}$("select#ctlPerson").html(options);})})})

源码

8.自动替换丢失的图片

12345678 // Safe Snippet$("img").error(function() {$(this).unbind("error").attr("src","missing_image.gif");});// Persistent Snipper$("img").error(function() {$(this).attr("src","missing_image.gif");});

源码

9.在鼠标悬停时显示淡入/淡出特效

12345678 $(document).ready(function(){$(".thumbs img").fadeTo("slow", 0.6);// This sets the opacity of the thumbs to fade down to 60% when the page loads$(".thumbs img").hover(function(){$(this).fadeTo("slow", 1.0);// This should set the opacity to 100% on hover},function(){$(this).fadeTo("slow", 0.6);// This should set the opacity back to 60% on mouseout});});

源码

10.清空表单数据

1234567891011121314151617181920 functionclearForm(form) {// iterate over all of the inputs for the form// element that was passed in$(':input', form).each(function() {vartype =this.type;vartag =this.tagName.toLowerCase();// normalize case// it's ok to reset the value attr of text inputs,// password inputs, and textareasif(type == 'text' || type == 'password' || tag == 'textarea')this.value = "";// checkboxes and radios need to have their checked state cleared// but should *not* have their 'value' changedelse 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;});};

源码

11.预防对表单进行多次提交

123456789101112131415 $(document).ready(function() {$('form').submit(function() {if(typeofjQuery.data(this,"disabledOnSubmit") =='undefined') {jQuery.data(this,"disabledOnSubmit", { submited:true});$('input[type=submit], input[type=button]',this).each(function() {$(this).attr("disabled","disabled");});returntrue;}else{returnfalse;}});});

源码

12.动态添加表单元素

12345 //change event on password1 field to prompt new input$('#password1').change(function() {//dynamically create new input and insert after password1$("#password1").append("");});

源码

13.让整个Div可点击

12	`blah blah blah. linkThe following lines of jQuery will make the entire div clickable: $(".myBox").click(function(){ window.location=$(this).find("a").attr("href");returnfalse; });`

源码

14.平衡高度或Div元素

12345 varmaxHeight = 0;$("div").each(function(){if($(this).height() > maxHeight) { maxHeight = $(this).height(); }});$("div").height(maxHeight);

源码

15. 在窗口滚动时自动加载内容

123456789101112131415161718 varloading =false;$(window).scroll(function(){if((($(window).scrollTop()+$(window).height())+250)>=$(document).height()){if(loading ==false){loading =true;$('#loadingbar').css("display","block");$.get("load.php?start="+$('#loaded_max').val(),function(loaded){$('body').append(loaded);$('#loaded_max').val(parseInt($('#loaded_max').val())+50);$('#loadingbar').css("display","none");loading =false;});}}});$(document).ready(function() {$('#loaded_max').val(50);});

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