【JavaScript】筆記01——Making Stuff Happen？？？
阿新 • • 發佈：2017-06-14
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A browser then runs JavaScript line-by-line, starting at the top of the file or
While, generally speaking, HTML is for content and CSS is for presentation, JavaScript is for interactivity.
1、從HTML到JavaScript，像下面這樣：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
alert("Hello, world.");
</script>
alert的意思是警告，類似於message. 效果上就是彈出一個對話框。
2、引用外部的.js文件
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> <script src="script.js"></script></body> </html>
script.js
alert("Hello, world.");
3、在瀏覽器Console中運行JavaScript代碼，Chrome進入Console的快捷鍵是F12
4、在正式開始學習前，需要強調的是：
A browser then runs JavaScript line-by-line, starting at the top of the file or script element and finishing at the bottom (unless you tell it to go elsewhere).
5、詢問用戶姓氏的小程序
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
var surname = prompt(‘Greetings friend, may I enquire as to your surname?‘);
</script>
</body>
</html>
通過瀏覽器運行這段代碼，將跳出一個“小盒子”，詢問你的姓氏。
6、變量類似於一個“盒子”，我們利用它來儲存數據；它具有“名”和“值”。
聲明（Declaration）
var surname; var age;
初始化（Initialization）
var name = "Tom";
賦值（assignment）
name = "Andy";
age = 43;
【JavaScript】筆記01——Making Stuff Happen？？？