源代碼
點擊運行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>教程</title> </head> <body> <script> var txt = "Hello World!"; document.write("<p>" + txt.length + "</p>"); var txt="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; document.write("<p>" + txt.length + "</p>"); </script> </body> </html>
運行結果