编辑下面的代码:【加编码】
<html> <body> <script> var txt = "Hello World!"; document.write("<p>" + txt.length + "</p>"); var txt="ABCDEFGHIJKLMNOPQRSTUVWXYZ"; document.write("<p>" + txt.length + "</p>"); </script> </body> </html>
结果: 【此窗口】 帮助?
Try it Yourself - © 自强学堂