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本篇內容主要講解“如何使用jQuery制作Web圖片輪播效果”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓小編來帶大家學習“如何使用jQuery制作Web圖片輪播效果”吧!
jquery提供了豐富的選擇器以及用來挑選元素的方法，這極大的簡化了我們的開發，例如$(".slider-item").filter(".slider-item-selected")選擇了當前處于激活狀態的索引按鈕。
兩張輪播圖的切換顯示效果是通過jquery的fadeOut()和fadeIn()方法來實現的，具體的使用參照jquery的api；
CSS透明背景的實現： background: rgba(0, 0, 0, 0.2);filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#33000000,endColorstr=#33000000); 兼容大部分主流瀏覽器包括IE；為什么不使用opacity呢？因為opacity會使文字也透明（子元素也會透明）。
HTML骨架很重要，你寫的html的結果應該是良好的。
代碼部分：
HTML:
<pre name="code" class="html"><div class="slider"> <div class="slider-extra"> <ul class="slider-nav"> <li class="slider-item">1</li> <li class="slider-item">2</li> <li class="slider-item">3</li> <li class="slider-item">4</li> </ul> <div class="slider-page"> <a class="slider-pre" href="javascript:;;"><</a> <a class="slider-next" href="javascript:;;">></a> </div> </div> </div>
CSS:
* {
padding: 0px;
margin: 0px;
}
a {
text-decoration: none;
}
ul {
list-style: outside none none;
}
.slider, .slider-panel img, .slider-extra {
width: 650px;
height: 413px;
}
.slider {
text-align: center;
margin: 30px auto;
position: relative;
}
.slider-panel, .slider-nav, .slider-pre, .slider-next {
position: absolute;
z-index: 8;
}
.slider-panel {
position: absolute;
}
.slider-panel img {
border: none;
}
.slider-extra {
position: relative;
}
.slider-nav {
margin-left: -51px;
position: absolute;
left: 50%;
bottom: 4px;
}
.slider-nav li {
background: #3e3e3e;
border-radius: 50%;
color: #fff;
cursor: pointer;
margin: 0 2px;
overflow: hidden;
text-align: center;
display: inline-block;
height: 18px;
line-height: 18px;
width: 18px;
}
.slider-nav .slider-item-selected {
background: blue;
}
.slider-page a{
background: rgba(0, 0, 0, 0.2);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#33000000,endColorstr=#33000000);
color: #fff;
text-align: center;
display: block;
font-family: "simsun";
font-size: 22px;
width: 28px;
height: 62px;
line-height: 62px;
margin-top: -31px;
position: absolute;
top: 50%;
}
.slider-page a:HOVER {
background: rgba(0, 0, 0, 0.4);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#66000000,endColorstr=#66000000);
}
.slider-next {
left: 100%;
margin-left: -28px;
}JavaScript：
$(document).ready(function() {
var length,
currentIndex = 0,
interval,
hasStarted = false, //是否已經開始輪播
t = 3000; //輪播時間間隔
length = $('.slider-panel').length;
//將除了第一張圖片隱藏
$('.slider-panel:not(:first)').hide();
//將第一個slider-item設為激活狀態
$('.slider-item:first').addClass('slider-item-selected');
//隱藏向前、向后翻按鈕
$('.slider-page').hide();
//鼠標上懸時顯示向前、向后翻按鈕,停止滑動，鼠標離開時隱藏向前、向后翻按鈕，開始滑動
$('.slider-panel, .slider-pre, .slider-next').hover(function() {
stop();
$('.slider-page').show();
}, function() {
$('.slider-page').hide();
start();
});
$('.slider-item').hover(function(e) {
stop();
var preIndex = $(".slider-item").filter(".slider-item-selected").index();
currentIndex = $(this).index();
play(preIndex, currentIndex);
}, function() {
start();
});
$('.slider-pre').unbind('click');
$('.slider-pre').bind('click', function() {
pre();
});
$('.slider-next').unbind('click');
$('.slider-next').bind('click', function() {
next();
});
/**
* 向前翻頁
*/
function pre() {
var preIndex = currentIndex;
currentIndex = (--currentIndex + length) % length;
play(preIndex, currentIndex);
}
/**
* 向后翻頁
*/
function next() {
var preIndex = currentIndex;
currentIndex = ++currentIndex % length;
play(preIndex, currentIndex);
}
/**
* 從preIndex頁翻到currentIndex頁
* preIndex 整數，翻頁的起始頁
* currentIndex 整數，翻到的那頁
*/
function play(preIndex, currentIndex) {
$('.slider-panel').eq(preIndex).fadeOut(500)
.parent().children().eq(currentIndex).fadeIn(1000);
$('.slider-item').removeClass('slider-item-selected');
$('.slider-item').eq(currentIndex).addClass('slider-item-selected');
}
/**
* 開始輪播
*/
function start() {
if(!hasStarted) {
hasStarted = true;
interval = setInterval(next, t);
}
}
/**
* 停止輪播
*/
function stop() {
clearInterval(interval);
hasStarted = false;
}
//開始輪播
start();
});首先是初始化部分：將除了第一張輪播圖片意外的圖片都隱藏，并且隱藏向前、向后按鈕，使第一個索引按鈕處于激活狀態。
事件部分：通過jquery的hover()綁定鼠標上懸以及離開時的事件處理， jquery的bind()方法綁定鼠標點擊事件處理向前、向后翻動、
輪播控制：pre(), next(), play(), start()開始自動輪播，stop()停止自動輪播。
上面的js寫的比較散，結構也不太好，讀起來也比較費力，也不易使用，耦合度較高。下篇將給出一個純粹的jquery輪播插件， 該插件可以定制各種效果，方便的配置以及可擴展。
下面是整體的代碼：
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jquery輪播效果圖 - by RiccioZhang</title>
<script type="text/javascript" src="scripts/jquery-1.9.1.js"></script>
<style type="text/css">
* {
padding: 0px;
margin: 0px;
}
a {
text-decoration: none;
}
ul {
list-style: outside none none;
}
.slider, .slider-panel img, .slider-extra {
width: 650px;
height: 413px;
}
.slider {
text-align: center;
margin: 30px auto;
position: relative;
}
.slider-panel, .slider-nav, .slider-pre, .slider-next {
position: absolute;
z-index: 8;
}
.slider-panel {
position: absolute;
}
.slider-panel img {
border: none;
}
.slider-extra {
position: relative;
}
.slider-nav {
margin-left: -51px;
position: absolute;
left: 50%;
bottom: 4px;
}
.slider-nav li {
background: #3e3e3e;
border-radius: 50%;
color: #fff;
cursor: pointer;
margin: 0 2px;
overflow: hidden;
text-align: center;
display: inline-block;
height: 18px;
line-height: 18px;
width: 18px;
}
.slider-nav .slider-item-selected {
background: blue;
}
.slider-page a{
background: rgba(0, 0, 0, 0.2);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#33000000,endColorstr=#33000000);
color: #fff;
text-align: center;
display: block;
font-family: "simsun";
font-size: 22px;
width: 28px;
height: 62px;
line-height: 62px;
margin-top: -31px;
position: absolute;
top: 50%;
}
.slider-page a:HOVER {
background: rgba(0, 0, 0, 0.4);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#66000000,endColorstr=#66000000);
}
.slider-next {
left: 100%;
margin-left: -28px;
}
</style>
<script type="text/javascript">
$(document).ready(function() {
var length,
currentIndex = 0,
interval,
hasStarted = false, //是否已經開始輪播
t = 3000; //輪播時間間隔
length = $('.slider-panel').length;
//將除了第一張圖片隱藏
$('.slider-panel:not(:first)').hide();
//將第一個slider-item設為激活狀態
$('.slider-item:first').addClass('slider-item-selected');
//隱藏向前、向后翻按鈕
$('.slider-page').hide();
//鼠標上懸時顯示向前、向后翻按鈕,停止滑動，鼠標離開時隱藏向前、向后翻按鈕，開始滑動
$('.slider-panel, .slider-pre, .slider-next').hover(function() {
stop();
$('.slider-page').show();
}, function() {
$('.slider-page').hide();
start();
});
$('.slider-item').hover(function(e) {
stop();
var preIndex = $(".slider-item").filter(".slider-item-selected").index();
currentIndex = $(this).index();
play(preIndex, currentIndex);
}, function() {
start();
});
$('.slider-pre').unbind('click');
$('.slider-pre').bind('click', function() {
pre();
});
$('.slider-next').unbind('click');
$('.slider-next').bind('click', function() {
next();
});
/**
* 向前翻頁
*/
function pre() {
var preIndex = currentIndex;
currentIndex = (--currentIndex + length) % length;
play(preIndex, currentIndex);
}
/**
* 向后翻頁
*/
function next() {
var preIndex = currentIndex;
currentIndex = ++currentIndex % length;
play(preIndex, currentIndex);
}
/**
* 從preIndex頁翻到currentIndex頁
* preIndex 整數，翻頁的起始頁
* currentIndex 整數，翻到的那頁
*/
function play(preIndex, currentIndex) {
$('.slider-panel').eq(preIndex).fadeOut(500)
.parent().children().eq(currentIndex).fadeIn(1000);
$('.slider-item').removeClass('slider-item-selected');
$('.slider-item').eq(currentIndex).addClass('slider-item-selected');
}
/**
* 開始輪播
*/
function start() {
if(!hasStarted) {
hasStarted = true;
interval = setInterval(next, t);
}
}
/**
* 停止輪播
*/
function stop() {
clearInterval(interval);
hasStarted = false;
}
//開始輪播
start();
});
</script>
</head>
<body>
<div class="slider">
<div class="slider-extra">
<ul class="slider-nav">
<li class="slider-item">1</li>
<li class="slider-item">2</li>
<li class="slider-item">3</li>
<li class="slider-item">4</li>
</ul>
<div class="slider-page">
<a class="slider-pre" href="javascript:;;"><</a>
<a class="slider-next" href="javascript:;;">></a>
</div>
</div>
</div>
</body>
</html>至此一個簡單的jquery輪播效果就完成了，當然還有很多需要改進的地方。
使用插件實現
上面的效果看起來還令人滿意，唯一不足的就是：每次需要輪播效果時，要將代碼復制粘貼過去，如果有些部分需要修改（例如：輪播時的動畫效果，前一篇使用的是jquery的淡入淡出效果，如果改成滑動效果，不可避免的要修改js代碼），那么就需要對js代碼進行修改，對我所寫的jquery輪播效果的js代碼不熟悉的程序員來說，修改這些js確實很困難。輪播插件所要實現的目標之一就是插件可以靈活配置（不光只是本篇文章的插件），程序員只需要寫少量的代碼就可以實現豐富的功能，這當然是一件很好的事情。
嗯，我們來看代碼：
(function($, window, document) {
//---- Statics
var DEFAULT_ANIMATE_TYPE = 'fade',
ARRAY_SLICE = [].slice,
ARRAY_CONCAT = [].concat
;
//---- Methods
function concatArray() {
var deep = false,
result = [];
if(arguments.length > 0 &&
arguments[arguments.length - 1] === true) {
deep = true;
}
for(var i = 0; i < arguments.length; i++) {
if(!!arguments[i].length) {
if(deep) {
for(var j = 0; j < arguments[i].length; j++) {
//recursive call
result = ARRAY_CONCAT.call(result,
concatArray(arguments[i][j], true));
}
} else {
result = ARRAY_CONCAT.call(result, arguments[i]);
}
} else if(i != arguments.length - 1 ||
(arguments[arguments.length - 1] !== true &&
arguments[arguments.length - 1] !== false)) {
result.push(arguments[i]);
}
}
return result;
}
//----- Core
$.fn.extend({
zslider: function(zsliderSetting, autoStart) {
var itemLenght = 0,
currItemIndex = 0,
started = false,
oInterval = {},
setting = {
intervalTime: 3000,
step: 1,
imagePanels: $(),
animateConfig: {
atype: 'fade',
fadeInSpeed: 500,
fadeOutSpeed: 1000
},
panelHoverStop: true,
ctrlItems: $(),
ctrlItemActivateType: 'hover' || 'click',
ctrlItemHoverCls: '',
flipBtn: {},
panelHoverShowFlipBtn: true,
callbacks: {
animate: null
}
},
that = this
;
//core methods
var slider = {
pre: function() {
var toIndex = itemLenght +
(currItemIndex - setting.step) % itemLenght;
slider.to(toIndex);
},
next: function() {
var toIndex = (currItemIndex + setting.step) % itemLenght;
slider.to(toIndex);
},
to: function(toIndex) {
//handle the index value
if(typeof toIndex === 'function') {
toIndex = toIndex.call(that, concatArray(setting.imagePanels, true),
concatArray(setting.ctrlItems, true),
currItemIndex, step);
}
if(window.isNaN(toIndex)) {
toIndex = 0;
}
toIndex = Math.round(+toIndex) % itemLenght;
if(toIndex < 0) {
toIndex = itemLenght + toIndex;
}
var currentPanel = setting.imagePanels.eq(currItemIndex),
toPanel = setting.imagePanels.eq(toIndex),
currrntCtrlItem = setting.ctrlItems.eq(currItemIndex)
toCtrlItem = setting.ctrlItems.eq(toIndex)
;
if(!setting.callbacks.animate ||
setting.callbacks.animate.call(that,
concatArray(setting.imagePanels, true),
concatArray(setting.ctrlItems, true),
currItemIndex, toIndex) === true) {
currrntCtrlItem.removeClass(setting.ctrlItemHoverCls);
toCtrlItem.addClass(setting.ctrlItemHoverCls);
toPanel.fadeIn(setting.animateConfig.fadeInSpeed);
currentPanel.fadeOut(setting.animateConfig.fadeOutSpeed);
}
//set the current item index
currItemIndex = toIndex;
},
start: function() {
if(!started) {
started = true;
oInterval =
window.setInterval(slider.next, setting.intervalTime);
}
},
stop: function() {
if(started) {
started = false;
window.clearInterval(oInterval);
}
},
isStarted: function() {
return started;
}
};
function initData() {
if(zsliderSetting) {
var temp_callbacks = zsliderSetting.callbacks;
$.extend(setting, zsliderSetting);
$.extend(setting.callbacks, temp_callbacks);
itemLenght = setting.imagePanels.length;
}
//convert to the jquery object
setting.imagePanels = $(setting.imagePanels);
setting.ctrlItems = $(setting.ctrlItems);
setting.flipBtn.container = $(setting.flipBtn.container);
setting.flipBtn.preBtn = $(setting.flipBtn.preBtn);
setting.flipBtn.nextBtn = $(setting.flipBtn.nextBtn);
}
function initLook() {
//show the first image panel and hide other
setting.imagePanels.hide();
setting.imagePanels.filter(':first').show();
//activate the first control item and deactivate other
setting.ctrlItems.removeClass(setting.ctrlItemHoverCls);
setting.ctrlItems.filter(':first').addClass(setting.ctrlItemHoverCls);
$(that).css('overflow', 'hidden');
if(setting.panelHoverShowFlipBtn) {
showFlipBtn(false);
}
}
function initEvent() {
$(concatArray(setting.imagePanels,
setting.flipBtn.preBtn, setting.flipBtn.nextBtn, true)).hover(function() {
if(setting.panelHoverStop) {
slider.stop();
}
if(setting.panelHoverShowFlipBtn) {
showFlipBtn(true);
}
}, function() {
slider.start();
if(setting.panelHoverShowFlipBtn) {
showFlipBtn(false);
}
});
if(setting.ctrlItemActivateType === 'click') {
setting.ctrlItems.unbind('click');
setting.ctrlItems.bind('click', function() {
slider.to($(this).index());
});
} else {
setting.ctrlItems.hover(function() {
slider.stop();
slider.to($(this).index());
}, function() {
slider.start();
});
}
setting.flipBtn.preBtn.unbind('click');
setting.flipBtn.preBtn.bind('click', function() {
slider.pre();
});
setting.flipBtn.nextBtn.unbind('click');
setting.flipBtn.nextBtn.bind('click', function() {
slider.next();
});
}
function init() {
initData();
initLook();
initEvent();
}
function showFlipBtn(show) {
var hasContainer = setting.flipBtn.container.length > 0,
eles;
eles = hasContainer ? setting.flipBtn.container :
//to the dom array:
/*ARRAY_CONCAT.call(ARRAY_SLICE.apply(setting.flipBtn.preBtn),
ARRAY_SLICE.apply(setting.flipBtn.nextBtn));*/
concatArray(setting.flipBtn.preBtn,
setting.flipBtn.nextBtn, true);
if(show) {
$(eles).show();
} else {
$(eles).hide();
}
}
init();
if(arguments.length < 2 || !!autoStart){
slider.start();
}
return slider;
}
});
})(jQuery, window, document);到此，相信大家對“如何使用jQuery制作Web圖片輪播效果”有了更深的了解，不妨來實際操作一番吧！這里是億速云網站，更多相關內容可以進入相關頻道進行查詢，關注我們，繼續學習！
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