<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>欢迎来到js世界</title>
<script type="text/javascript">
</script>
</head>
<body>
<input type="button" name="btn" value="弹出消息框" onClick="javascript:alert('好好学习Javascript');"/>
</body>
</html>
图片发自简书App
