我试图限制用户可以在每个输入中输入的内容......除了 nothing() 函数外，一切都按计划进行：
我希望此函数允许将所有字符输入到 onKeyDown="nothing();" 的输入中。出于某种原因， nothing() 函数中的那些遵循与用户名相同的布局（只有文本和数字）。
请帮助它将不胜感激。谢谢你的时间..
<?php
session_start();
?>
<html>
<head>
<title>Registration</title>
<link href="style.css" rel="stylesheet" type="text/css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<form action="registration.php" method="post" name = "register" >
<div style="width:50%; margin:auto;">
<h1>Register</h1>
<p>Please fill in this form to create an account.</p>
<hr>
<label for="username"><b>Username:</b></label>
<input type="text" placeholder="Username" name="username" pattern="[^-,]+" onKeyDown="ValidateName();" >
<label style="width:50%" for="fname"><b>First Name:</b></label>
<input type="text" placeholder="Enter First Name" pattern="[^-,]+" name="fname" onKeyDown="ValidateFname();">
<label for="lname"><b>Last Name:</b></label>
<input type="text" placeholder="Ender Last Name" pattern="[^-,]+" name="lname" onKeyDown="ValidateLname();"><br><br>
<label for="dob"><b>Date of Birth</b></label>
<input type="date" placeholder="" name="dob"> <br><br>
<label for="ingame"><b>In Game Name:</b></label>
<input type="text" placeholder="Enter In Game Name" name="ingame" onKeyDown="ValidateIGN();">
<label for="email"><b>Email</b></label>
<input type="text" placeholder="Enter Email" name="email" pattern="[^-,]+" onKeyDown="nothing()">
<label for="pw"><b>Password</b></label>
<input type="password" placeholder="Enter Password" name="pw" pattern="[^-,]+" onKeyDown="nothing()">
<label for="psw-repeat"><b>Confirm Password</b></label>
<input type="password" placeholder="Repeat Password" name="confpw" pattern="[^-,]+" onKeyDown="nothing()">
<button onclick="" name="register" type="submit" class="register">Register</button>
</div>
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