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How to achieve seamless carousel effect (automatic carousel) in jq? (code example)

青灯夜游

Oct 26, 2018 pm 03:36 PM

jquerySeamless carouselcarousel

本篇文章给大家介绍jq实现无缝轮播图效果的方法，可以自动轮播，也可以手动点击切换轮播。有一定的参考价值，有需要的朋友可以参考一下，希望对你们有所帮助。

我们在很多的网站上都可以看到轮播图，例如在淘宝、京东这些网站都有轮播图的存在；轮播图的使用范围非常广，banner和animation很容易抓住用户的眼球，所以做好这个也就是一个网页一个app的关键之一。

轮播图有多种实现方式，可以用css实现、用jQuery实现、甚至是用其他框架实现，下面我们就以jQuery方法举例，用jQuery代码做一个自动+手动轮播图片的轮播图效果。

jq实现无缝轮播图效果（自动轮播）的代码示例：

html代码：

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>jQuery实现无缝轮播图</title>
		<link href="css/style.css" rel="stylesheet" type="text/css"/>
	</head>
	<body>
		<div class="banner">
			<ul class="img">
				<li>
					<a href="#"><img  src="/static/imghwm/default1.png"  data-src="img/2.png"  class="lazy"   alt="How to achieve seamless carousel effect (automatic carousel) in jq? (code example)" ></a>
				</li>
				<li>
					<a href="#"><img  src="/static/imghwm/default1.png"  data-src="img/2.png"  class="lazy"   alt="How to achieve seamless carousel effect (automatic carousel) in jq? (code example)" ></a>
				</li>
				<li>
					<a href="#"><img  src="/static/imghwm/default1.png"  data-src="img/2.png"  class="lazy"   alt="How to achieve seamless carousel effect (automatic carousel) in jq? (code example)" ></a>
				</li>
				<li>
					<a href="#"><img  src="/static/imghwm/default1.png"  data-src="img/2.png"  class="lazy"   alt="How to achieve seamless carousel effect (automatic carousel) in jq? (code example)" ></a>
				</li>
			</ul>

			<ul class="num">
			</ul>
			<div class="btn btn_l"><</div>
			<div class="btn btn_r">></div>
		</div>

	</body>
</html>

上面是html代码，代码的结构比较简单，这里解释一下，ul.img标签是要左右移动的，ul.img标签里就是轮播图的主体内容了；然后ul.num标签是提供索引和下标控制符，绑定动画的，会通过jq代码来控制数量与图片一致。btn_l和tn_r类名的div标签是提供左右按钮，这样轮播图就可以点击实现手动的左右滑动。

css代码：

* {
	padding: 0;
	margin: 0;
	list-style: none;
}

.banner {
	margin: 100px auto;
	border: 5px solid #000;
	width: 1000px;
	height: 640px;
	position: relative;
	overflow: hidden;
}

.banner .img {
	width: 5000px;
	position: absolute;
	left: 0px;
	top: 0px;
}

.banner .img li {
	float: left;
}

.banner .img li img {
	width: 1000px;
}


/*小圆点的样式*/

.banner .num {
	position: absolute;
	right: 40px;
	bottom: 30px;
}

.banner .num li {
	width: 20px;
	height: 20px;
	float: left;
	background: #333;
	margin-left: 20px;
	border-radius: 50px;
	border: 2px solid white;
}

.banner .num li.on {
	border: 2px solid #333;
	background: white
}


/*两边耳朵的样式*/

.banner .btn {
	position: absolute;
	width: 80px;
	height: 80px;
	background: rgba(0, 0, 0, 0.7);
	font-size: 60px;
	color: white;
	text-align: center;
	line-height: 80px;
	top: 50%;
	margin-top: -80px;
	cursor: pointer;
	display: none;
}

.banner:hover .btn {
	display: block;
}

.banner .btn_l {
	left: 10px;
	border-radius: 50%
}

.banner .btn_r {
	right: 10px;
	border-radius: 50%
}

我们链接的外部css文件，然后请注意一下各种属性和值。

jquery代码：

首先要引用jquery.js文件

<script type="text/javascript" src="s/jquery-1.7.2.min.js"></script>

注：想要使用jquery来实现各种效果，就必须要先引用jquery.js文件，在使用jquery代码来实现各种效果。

在使用jquery语句来实现轮播效果：

<script>
		$(function() {
			var i = 0;
			var clone = $(".banner .img li").first().clone();
			$(".banner .img").append(clone);
			var size = $(".banner .img li").size();
			for(var j = 0; j < size - 1; j++) {
				$(".banner .num").append("<li></li>");
			}
			$(".banner .num li").first().addClass(&#39;on&#39;);
			//鼠标划入圆点
			$(".banner .num li").hover(function() {
				var index = $(this).index();
				i = index;
				$(".banner .img").stop().animate({
					left: -index * 1000
				}, 500);
				$(this).addClass(&#39;on&#39;).siblings().removeClass(&#39;on&#39;);
			})

			/*轮播图自动轮播*/
			var t = setInterval(function() {
				i++;
				move();
			}, 2000);

			//对banner定时器的操作
			$(".banner").hover(function() {
				clearInterval(t);
			}, function() {
				t = setInterval(move, 2000);
			})

			/*向左按钮*/
			$(".banner .btn_l").click(function() {
				i--;
				move();
			})
			/*向右按钮*/
			$(".banner .btn_r").click(function() {
				i++;
				move();
			})
                        
                        /*封装函数*/
			function move() {
				if(i == size) {
					$(".banner .img").css({
						left: 0
					});
					i = 1;
				}
				if(i == -1) {
					$(".banner .img").css({
						left: -(size - 1) * 1000
					});
					i = size - 2;
				}

				$(".banner .img").stop().animate({
					left: -i * 1000
				}, 500);

				if(i == size - 1) {
					$(".banner .num li").eq(0).addClass(&#39;on&#39;).siblings().removeClass(&#39;on&#39;);
				} else {
					$(".banner .num li").eq(i).addClass(&#39;on&#39;).siblings().removeClass(&#39;on&#39;);
				}
			}
		})
	</script>

我们来看看效果（静态）：

How to achieve seamless carousel effect (automatic carousel) in jq? (code example)

总结：以上就是jQuery实现无缝轮播图效果的全部代码，大家可以自己动手尝试编译，看看效果，加深理解，制作属于自己的轮播图。希望能对大家的学习有所帮助，更多相关教程请访问JavaScript视频教程，jQuery视频教程，bootstrap教程！

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