简单的单击图片循环播放：
<!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='img'>
<button id='prev'>上一张</button>
<button id='next'>下一张</button>
</body>
<script>
window.onload = function(){ //获取要用到的元素，标签
var img = document.getElementById('img'); var prev = document.getElementById('prev'); var next = document.getElementById('next'); //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 = 'imges/0' + activeIndex + '.jpg';
if(activeIndex === 1){
activeIndex = 5;
}else{activeIndex --;}
}
next.onclick = function(){
if(activeIndex === 5){
activeIndex = 1;
}else{
activeIndex++;
}
img.src = 'imges/0' + activeIndex + '.jpg';
}
}
</script>
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