console
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<img id="img" src="https://whl-zhijing.oss-cn-shenzhen.aliyuncs.com/static/images/index1.png" />
<button id="btn">切换</button>
<script>
let img = document.getElementById('img')
let btn = document.getElementById('btn')
btn.addEventListener('click', function (res) {
let src = img.src
if (src == 'https://whl-zhijing.oss-cn-shenzhen.aliyuncs.com/static/images/index1.png') {
img.src = 'https://whl-zhijing.oss-cn-shenzhen.aliyuncs.com/static/images/index1-active.png'
} else {
img.src = 'https://whl-zhijing.oss-cn-shenzhen.aliyuncs.com/static/images/index1.png'
}
})
</script>
</body>
</html>