js

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
var a = 10;
var b = 20;
var temp = a + b;
alert (temp);
</script>
</head>
<body>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
var a;
alert(a);
</script>
</head>
<body>
</body>
</html>

 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>
<script type="text/javascript" src="2外部引入.js"></script>
</title>
</head>
<body>
</body>
</html>

alert("你好");

 

posted @ 2021-07-28 21:37  爽爽子的秃头生活  阅读(30)  评论(0)    收藏  举报