当我将重点放在表单内的密码字段上时，active类将添加到label标记中，但是会自动删除，并且我无法在该字段中键入< / strong>。在Firefox（64.0）中会发生这种情况，而在Chrome（71.0.3578.98）中不会发生。
这是表格的html
<form id="signup-form">
<div class="input-field">
<input type="email" id="signup-email" required />
<label for="signup-email">Email address</label>
</div>
<div class="input-field">
<input type="password" id="signup-password" required />
<label for="signup-password">Choose password</label>
</div>
<button class="btn yellow darken-2 z-depth-0">Sign up</button>
</form>
这是一个更完整的代码示例（您可能希望以全页模式查看它），登录和注册模式形式都存在他的问题：
// setup materialize components
document.addEventListener('DOMContentLoaded', function() {
var modals = document.querySelectorAll('.modal');
M.Modal.init(modals);
var items = document.querySelectorAll('.collapsible');
M.Collapsible.init(items);
});<!-- <!DOCTYPE html> -->
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<title>Game Guides</title>
</head>
<body class="grey lighten-3">
<!-- NAVBAR -->
<nav class="z-depth-0 grey lighten-4">
<div class="nav-wrapper container">
<a href="#" class="brand-logo">
</a>
<ul id="nav-mobile" class="right hide-on-med-and-down">
<li class="logged-in">
<a href="#" class="grey-text modal-trigger" data-target="modal-account">Account</a>
</li>
<li class="logged-in">
<a href="#" class="grey-text" id="logout">Logout</a>
</li>
<li class="logged-in">
<a href="#" class="grey-text modal-trigger" data-target="modal-create">Create Guide</a>
</li>
<li class="logged-out">
<a href="#" class="grey-text modal-trigger" data-target="modal-login">Login</a>
</li>
<li class="logged-out">
<a href="#" class="grey-text modal-trigger" data-target="modal-signup">Sign up</a>
</li>
</ul>
</div>
</nav>
<!-- SIGN UP MODAL -->
<div id="modal-signup" class="modal">
<div class="modal-content">
<h4>Sign up</h4><br />
<form id="signup-form">
<div class="input-field">
<input type="email" id="signup-email" required />
<label for="signup-email">Email address</label>
</div>
<div class="input-field">
<input type="password" id="signup-password" required class="validate" />
<label for="signup-password">Choose password</label>
</div>
<button class="btn yellow darken-2 z-depth-0">Sign up</button>
</form>
</div>
</div>
<!-- LOGIN MODAL -->
<div id="modal-login" class="modal">
<div class="modal-content">
<h4>Login</h4><br />
<form id="login-form">
<div class="input-field">
<input type="email" id="login-email" required />
<label for="login-email">Email address</label>
</div>
<div class="input-field">
<input type="password" id="login-password" required />
<label for="login-password">Your password</label>
</div>
<button class="btn yellow darken-2 z-depth-0">Login</button>
</form>
</div>
</div>
<!-- ACCOUNT MODAL -->
<div id="modal-account" class="modal">
<div class="modal-content center-align">
<h4>Account details</h4><br />
<div class="account-details"></div>
</div>
</div>
<!-- CREATE GUIDE MODAL -->
<div id="modal-create" class="modal">
<div class="modal-content">
<h4>Create Guide</h4><br />
<form id="create-form">
<div class="input-field">
<input type="text" id="title" required>
<label for="title">Guide Title</label>
</div>
<div class="input-field">
<textarea id="content" class="materialize-textarea" required></textarea>
<label for="content">Guide Content</label>
</div>
<button class="btn yellow darken-2 z-depth-0">Create</button>
</form>
</div>
</div>
<!-- GUIDE LIST -->
<div class="container" style="margin-top: 40px;">
<ul class="collapsible z-depth-0 guides" style="border: none;">
<li>
<div class="collapsible-header grey lighten-4">Guide title</div>
<div class="collapsible-body white">Lorem ipsum dolor sit amet.</div>
</li>
<li>
<div class="collapsible-header grey lighten-4">Guide title</div>
<div class="collapsible-body white"><span>Lorem ipsum dolor sit amet.</span></div>
</li>
<li>
<div class="collapsible-header grey lighten-4">Guide title</div>
<div class="collapsible-body white"><span>Lorem ipsum dolor sit amet.</span></div>
</li>
<li>
<div class="collapsible-header grey lighten-4">Guide title</div>
<div class="collapsible-body white"><span>Lorem ipsum dolor sit amet.</span></div>
</li>
</ul>
</div>
<script src="https://www.gstatic.com/firebasejs/5.7.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.7.2/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.7.2/firebase-firestore.js"></script>
<script>
// Initialize Firebase
</script>
<!-- Compiled and minified JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
<script>
</script>
</body>