代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<button onclick=alert("谁让你点的")>别点</button>
<button id="id1">点开吧</button>
<script>
document.getElementById(‘id1‘).onclick=function () {
alert("让你点你就点啊");
}
</script>
</body>
</html>
即可