<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS编写位置</title>
<script type="text/javascript" src="js/scriptjs.js">
// document.write('写点啥');
</script>
<script type="text/javascript">
document.write('写点啥');
</script>
</head>
<body>
<button onclick="alert('点了一下')">点击按钮</button>
<a href="javascript:alert('点了一下href');">点击链接</a>
</body>
</html>