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JavaScript--水平幻灯片

2015-05-28 20:49 447 查看

// 列表布局，图片左浮动，外侧容器设置overflow:hidden;

// 组合使用构造函数模式(对象不共享的数据)和原型模式(对象共享的数据)

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type="text/css" media="screen">
* { margin:0; padding:0; font-size: 14px;}
.slider { width:550px; height:200px; margin:50px auto 0; overflow: hidden;}
.slider ul { width:10000px; list-style:none; }
.slider li { float: left; }
.slider li img { width:550px; text-align: center;}
#slider-nav { width:550px;  margin:30px auto; text-align: center;}
#slider-nav button { height:34px; line-height: 34px; width:75px; text-align: center; cursor:pointer; margin:0 20px;}
</style>
</head>
<body>
<div class="slider">
<ul>
<li><img src="http://www.gbtags.com/gb/networks/uploads/afb73f09-8334-46b2-ad66-4abeb7c67a0a/images/gbtags1.jpg" alt="image"></li>
<li><img src="http://www.gbtags.com/gb/networks/uploads/afb73f09-8334-46b2-ad66-4abeb7c67a0a/images/gbtags2.jpg" alt="image"></li>
<li><img src="http://www.gbtags.com/gb/networks/uploads/afb73f09-8334-46b2-ad66-4abeb7c67a0a/images/gbtags3.jpg" alt="image"></li>
<li><img src="http://www.gbtags.com/gb/networks/uploads/afb73f09-8334-46b2-ad66-4abeb7c67a0a/images/gbtags4.jpg" alt="image"></li>
</ul>
</div>

<div id="slider-nav">
<button data-direction="prev">« 上一个</button><button data-direction="next">下一个 »</button>
</div>
</body>
<script src="http://cdn.gbtags.com/jquery/2.1.1/jquery.min.js"></script>
<script>

function Slider(container,nav){                             // 构造Slider()函数;
this.container = container;                             // 定义一系列局部变量;
this.nav = nav;
this.imgs = this.container.find('img');
this.imgWidth = this.imgs[0].width;
this.imgsLen = this.imgs.length;
this.current = 0;
};

Slider.prototype.transition = function(){                   // 使用prototype来定义transition()方法;
this.container.animate({                                // 编写外包围容器(ul)的运动方向及运动长度;
'margin-left':-(this.current*this.imgWidth)
});
};

Slider.prototype.setCurrent = function(dir){                // 使用prototype来定义setCurrent()方法;
var pos = this.current;
pos += (~~(dir === 'next') || -1);                      // 使用"~~"进行类型转换,转换成数字类型; ~~true == 1; ~~false == 0;
this.current = (pos < 0) ? this.imgsLen - 1 : pos % this.imgsLen;
return pos;
};

$(function(){
var container = $('.slider').children('ul'),            // 定义container变量的值;
slider = new Slider(container, $('#slider-nav'));   // 实例化Slider()函数并传参;

slider.nav.find('button').on('click',function(){        // 找到触发按钮并绑定事件;
slider.setCurrent($(this).data('direction'));       // 调用setCurrent()函数并传入按钮的data-direction的值;
slider.transition();                                // 调用transition()方法,使幻灯片运动;
})
});

</script>
</html>

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