<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script>
function change(){
var p1=document.getElementById("puture1")
p1.src="img/5.jpg"
}
</script>
</head>
<body>
<img src="img/4.jpg" id="puture1" width="70%"/>
<input type="button" value="点击我切换图片" onclick="change()"/>
</body>
</html>
图片要自己弄