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JavaScript? ??? ?? ????

<… < /script>

<body>...</body> ?? ?? ??? ??? <script>...</script> ??? ????. ??? ? ??? ??? ? ?? ?? ??? HTML?? JavaScript? ???? ? ?? ?? ??? ????. ??? JavaScript

??? ???? <script> ??? <body>...</body> <head>...</head> ?? ?: 

<html>
<head>
<h1> JavaScript in head. </h1>
<script>
alert("hello word!");
</script>
</head>
<body></body>
</html>

? ????? ?? ??? ?? ????? ??? ??? ???? JavaScript ??? < ;head></head> ; ? ?? ?? <body></body>? ?? ??? ??? ????.

??? ??? <head></head> <body>? ?? ??? ?? ???? ?? ????. head ??? ??? ??? ???? ???? ?? ?? ???? ??, ??? ??? ???? ????? ?? ? ??? ?? ? ?????.

?? JavaScript

HTML?? JavaScript ??? ?? ???? ? ??? js ??? JavaScript ??? ??? ?? ????. ?? js?? ????. HTML? ? ??. "hello world"? ?? ???????.

??? ???? ?? ??? ???? ??? "out.js"? ??? ? ????? ????. alert("hello word!");

?? ??? ???? ??? "test2.html"? ???? ????? ????. 

<html>
<head>
<h1> my JavaScript code in "out.js" </h1>
</head>
<body>
<script src="out.js"></script>
</body>
</html>

????? ?????? "test2.html" ??? ?????? ????? ?????. ???? ?? ??? ?? ? ??? ??? ??? ?? ? ? ????.

?? ?? ? ?? ??? ???? ??? ? JavaScript ??? HTML? ?? ?????. JavaScript ??? ?? ??? ???? ???? ????? JavaScript ??? ??? ?? ???? ?????.

??? ?? ??? ????. ???? ??? ??? ??, ?? ??? ?? ?? JavaScript ??? ?? ??? ?? ???? ??? ?? ??? ?? ?????.

HTML ??? ?? ??? ?? JavaScript ??? ????, ?? ???? 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>