<!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>
<button>按钮1</button>
<button>按钮2</button>
<button>按钮3</button>
<button>按钮4</button>
<button>按钮5</button>
<script>
// 1. 获取所有按钮元素
let btns = document.getElementsByTagName('button');
// btns得到的是伪数组 里面的每一个元素 btns[i]
for (let i = 0; i < btns.length; i++) {
btns[i].onclick = function() {
// (1) 我们先把所有的按钮背景颜色去掉
for (let i = 0; i < btns.length; i++) {
btns[i].style.backgroundColor = '';
}
// (2) 然后才让当前的元素背景颜色为red
this.style.backgroundColor = 'red';
}
}
</script>
</body>
</html>
![thinkphp6报错Driver [Think] not supported.](https://img-blog.csdnimg.cn/direct/bdb0ae1607e14257aaf4f787ce44cc56.png#pic_center)
