js实现适合新闻类图片的轮播效果

2016年11月30日作者：Lasy 原文

话不多说，请看代码：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Picture carousel</title>
<style>
*
{
 margin: 0;
 padding: 0;
}
.carousel-container
{
 overflow: hidden;
 width: 405px;/* 130*3+5*3 = 405 */
 height: 150px;
 margin: 50px auto;
 background-color: #2c2c2c;
}
.carousel-area
{
 width: 1350px;/* 675*2 = 1350 */
 height: 150px;
}
.carousel-ul
{
 float: left;
 overflow: hidden;
 width: 675px;/* 130*5+5*5 = 675 */
 height: 150px;
}
.carousel-ul li
{
 float: left;
 overflow: hidden;
 width: 130px;
 height: 130px;
 margin: 10px 5px 10px 0;
 list-style-type: none;
}
 </style>
</head>
<body>
 <div class="carousel-container">
 <div class="carousel-area">
 <ul class="carousel-ul" id="carousel-ul-1">
 <li><img src="img/1.gif" alt=""></li>
 <li><img src="img/2.jpg" alt=""></li>
 <li><img src="img/3.jpg" alt=""></li>
 <li><img src="img/4.jpg" alt=""></li>
 <li><img src="img/5.gif" alt=""></li>
 </ul>
 </div>
 </div>
<script src="//cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script>
<script>
 $(document).ready(function() {
 var carousel_interval_id, //interval ID
 start_carousel_flag = false, //是否开始interval
 carousel_speed = 50, //滚动速度（px/s）,carousel_speed=1000/interval时间间隔。
 start_interval = function() { //执行interval
  start_carousel_flag = true;
  carousel_interval_id = setInterval(function() {
  var margin_left = $('.carousel-area').css('margin-left');
  $('.carousel-area').css('margin-left', (parseInt(margin_left) - 1) + 'px'); //不断左移1px
  if (parseInt($('.carousel-area').css('margin-left')) <= -($('.carousel-ul').width())) { //轮播部分超出容器后复位
   $('.carousel-area').css('margin-left', 0);
  }
  }, 1000 / carousel_speed)
 },
 end_interval = function() { //停止interval
  start_carousel_flag = false;
  carousel_interval_id = clearInterval(carousel_interval_id);
 }
 $('.carousel-area').append('<ul class="carousel-ul">' + $('.carousel-ul').html() + '</ul>'); //复制carousel-ul，填补左移后出现的无内容区域，以此完成循环
 start_interval();
 $('.carousel-area').hover(
 function() { //鼠标悬停事件
  if (start_carousel_flag) { //已经开始interval
  end_interval();
  }
 },
 function() { //鼠标离开事件
  if (!start_carousel_flag) { //没有开始interval
  start_interval();
  }
 }
 )
})
</script>
</body>
</html>

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