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最基本的javascript native carousel (1)

原理:主要运用z-index这个属性来设置图片的展示和隐藏,代码如下:

 1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4     <meta charset="UTF-8"> 5     <title>zIndex制作轮播图</title> 6     <style> 7         html,body,ul,li,input{margin: 0;padding: 0} 8         .box1{ 9             width: 520px;10             height: 280px;11             margin: 0 auto;12             position: relative;13             border:1px solid black;14         }15         ul{16             width: 520px;17             height: 280px;18             position: relative;19         }20         ul li{21             position: absolute;22             list-style: none;23         }24         ul li a{25             display: block;26             width: 520px;27             height: 280px;28         }29         .btn1{30             position: absolute;31             width: 48px;32             height: 60px;33             background: url(btn.png) no-repeat;34             border:0;35             left: 0;36             top:110px;37             cursor: pointer;38             z-index: 10000;39         }40         .btn2{41             position: absolute;42             width: 48px;43             height: 60px;44             background: url(btn.png) no-repeat -48px;45             border:0;46             right: 0;47             top:110px;48             cursor: pointer;49             z-index: 10000;    50         }51     </style>52     <script>53         window.onload = function(){54             var btn1 = document.getElementsByClassName("btn1")[0];55             var btn2 = document.getElementsByClassName("btn2")[0];//有兼容问题56             var liList = document.getElementsByTagName("ul")[0].children;57             var index = 1;58             var i = 4;59             btn1.onclick = function(){60                 i++;61                 if(i == 5){62                     i = 0;63                 }64                 liList[i].style.zIndex = index++;65             }66             btn2.onclick = function(){67                 i--;68                 if(i == -1){69                     i = 4;70                 }71                 liList[i].style.zIndex = index++;72             }73             var timer = setInterval(function(){btn2.onclick();},1000)74         }75     </script>76 </head>77 <body>78     <div class="box1">79         <ul>80             <li><a href=""><img src="5.jpg" alt=""></a></li>81             <li><a href=""><img src="4.jpg" alt=""></a></li>82             <li><a href=""><img src="3.jpg" alt=""></a></li>83             <li><a href=""><img src="2.jpg" alt=""></a></li>84             <li><a href=""><img src="1.jpg" alt=""></a></li>85         </ul>86         <input type="button" name="" class="btn1" />87         <input type="button" name="" class="btn2" />88     </div>89 </body>90 </html>

 问题:在这里我们加了一个定时器来让图片自己切换,当我们点击按钮的时候需要关闭定时器,这个可以通过clearInterval(timer)来实现,但是当我们不点击按钮的时候,想让定时器接着我们现在的图片自动轮播下去,这个问题如何解决呢?重新开定时器吗?

最基本的javascript native carousel (1)