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? ?? JavaScript ???? ??

??? ??? ?? ? ??? "hello world"? ? ?? ?????? ???? ?? ????? ?? JavaScript ??? ?????. 

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

JavaScript ??? <script> ??? ???? ? ??? ??? "hello world!"? ???? ?? ??? ???? ????. ? ??? HTML ??? ???? ??? "test.html"? ??? ?? ??? ? ? ???? ???? FireFox ????? ???? ??? ???.

QQ截圖20161012101119.png

?? JavaScript ????? ???? ?? ?? ?????.


???? ??
||
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title> RunJS 演示代碼 </title> <script> var ck = function(){ var x = prompt ("輸入數(shù)據(jù): ", ""); alert(x); } </script> </head> <body> <button onclick="ck();"> 輸入按鈕 </button> </body> </html>