<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title> 点击按钮切换对应图片 </title>
</head>
<body>
<!-- input[type=button value=第$张]*4 -->
<input type="button" value="第1张"title="01.jpg">
<input type="button" value="第2张"title="02.jpg">
<input type="button" value="第3张"title="03.jpg">
<input type="button" value="第4张"title="04.jpg">
<br>
<img src="../images/01.jpg" alt="" style="width : 200px">
<script>
//找到img
var img = document.getElementsByTagName('img')[0];
//找到4个按钮
var inList = document.getElementsByTagName('input');
//遍历所有按钮，给他们加点击事件
for(var i = 0; i < inList.length; i++){
inList[i].onclick = function() {
img.src = "../images/" + this.title;
}
}
</script>
</body>
</html>
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