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JS 参考手册
Input Email maxLength 属性
tryjsref_email_maxlength
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<!DOCTYPE html> <html> <body> E-mail: <input type="email" id="myEmail" maxlength="30"> <p>Click the button to display the value of the maxlength attribute of the email field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myEmail").maxLength; document.getElementById("demo").innerHTML = x; } </script> </body> </html>