基本语法：script标签卸载head标签内；alert-浏览器弹窗，document-网页中要写的内容，console-控制台信息。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js基本语法</title>
<script type="text/javascript">
alert('hello');
document('What are you doing?');
console.log("I'm doing homework.");
</script>
</head>
<body>
</body>
</html>
image.png
1.png
2.png
