fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> E-mail: <input type="email" id="myEmail"> <p>点击按钮设置 email 字段允许填入的最大字符数。</p> <p id="demo"></p> <button onclick="myFunction()">点我</button> <script> function myFunction() { document.getElementById("myEmail").maxLength = "8"; document.getElementById("demo").innerHTML = "email 字段允许填入的最大字符数为 8。"; } </script> </body> </html>
运行结果