js implements simple click on picture loop playback-JS Tutorial-php.cn

js implements simple click on picture loop playback

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Release： 2018-07-05 17:38:11

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This article mainly introduces the js implementation of simple click picture loop playback, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

Simple click picture loop Play:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <img src="imges/01.jpg" alt="" id=&#39;img&#39;>
    <button id=&#39;prev&#39;>上一张</button>
    <button id=&#39;next&#39;>下一张</button>
    
</body>
    <script>
        window.onload = function(){            //获取要用到的元素，标签

            var img = document.getElementById(&#39;img&#39;);            var prev = document.getElementById(&#39;prev&#39;);            var next = document.getElementById(&#39;next&#39;);            //定义两端的临界值， 定义活动的变量 最大5张、

            var maxIndex = 5;            var minIndex = 1;            var activeIndex = minIndex;            
            // 确定事件源  绑定事件函数。
            prev.onclick = function(){                //当点击 上一张的时候， img的src 实现切换
                img.src = &#39;imges/0&#39; + activeIndex + &#39;.jpg&#39;;                
                if(activeIndex === 1){
                    activeIndex = 5;
                }else{activeIndex --;}
            }

            next.onclick = function(){               
                if(activeIndex === 5){
                    activeIndex = 1;
                }else{
                    activeIndex++;
                }
                img.src = &#39;imges/0&#39; + activeIndex + &#39;.jpg&#39;;

            }

            

        }    
    
    </script>
</html>

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