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Write your first JavaScript program

When learning a new language, everyone likes to use "hello world" as the first program, so now we write a JavaScript version: 

<html>
<head></head>
<body>
<script>
alert("hello world!");
</script>
</body>
</html>

The JavaScript code is placed in <script> ...</script> tag, the effect of this code is to pop up a small box that displays "hello world!". Save this code as an HTML file, name it "test.html", then double-click the file, the system will call the FireFox browser to open it:

QQ截图20161012101119.png

Visible writing JavaScript program It is very convenient.


Continuing Learning
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<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title> RunJS 演示代码 </title> <script> var ck = function(){ var x = prompt ("输入数据: ", ""); alert(x); } </script> </head> <body> <button onclick="ck();"> 输入按钮 </button> </body> </html>
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