我正在使用表格通过php文件更新我的数据库，但我在 Firefox 中遇到以下错误：
未声明HTML文档的字符编码。该 在某些浏览器配置中，文档将使用乱码文本呈现 如果文档包含US-ASCII范围之外的字符。 必须在文档中声明页面的字符编码 在转移协议中。
在 Chrome 中出现以下错误：
为已经托管的元素调用Element.createShadowRoot（） 不赞成使用影子根。看到 https://www.chromestatus.com/features/4668884095336448了解更多信息 细节
一旦我点击上面的控制台消息提交按钮，就会显示一个完整的空白页面。
我附加了我的html和php文件以获得更好的想法。
register.html
<!DOCTYPE html PUBLIC"-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> Info</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<link rel="stylesheet" href="bootstrap/css/bootstrap.css">
<link rel="stylesheet" href="bootstrap/css/scheduler.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container container-table" >
<div id="loginbox" style="margin-top:50px;" class="mainbox col-md-6 col-md-offset-3 col-sm-8 col-sm-offset-2" >
<div class="panel panel-info" style="background-color:#ccc;">
<div class="panel-heading"style="background-color:#990000;">
<div class="panel-title" style="color:white; text-align:center">Register</div>
<!-- <div style="float:right; font-size: 80%; position: relative; top:-10px"><a href="#">Forgot password?</a></div>-->
</div>
<div style="padding-top:30px" class="panel-body" >
<div style="display:none" id="login-alert" class="alert alert-danger col-sm-12"></div>
<form action="register.php" id="loginform" class="form-horizontal" role="form" method="post">
<div style="margin-bottom: 20px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-education"></i></span>
<input id="login-username" type="text" class="form-control" name="sbuid" value="" placeholder="SBU ID">
</div>
<div style="margin-bottom: 20px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
<input id="login-username" type="text" class="form-control" name="stuName" value="" placeholder="Name">
</div>
<div style="margin-bottom: 20px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-envelope"></i></span>
<input id="login-username" type="text" class="form-control" name="emailID" value="" placeholder="Email ID">
</div>
<div style="margin-bottom: 20px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-earphone"></i></span>
<input id="login-username" type="text" class="form-control" name="contactInfo" value="" placeholder="Contact No.">
</div>
<div style="margin-bottom: 15px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-lock"></i></span>
<input id="login-password" type="password" class="form-control" name="pass" placeholder="Password">
</div>
<div style="margin-top:10px;text-align:center" class="form-group">
<!-- Button -->
<div class="col-sm-12 controls" >
<input type = "submit" value= "Register" class="btn btn-success"></input>
</div>
</div>
</form>
<div style="text-align:center">
<a href="index.html"><strong>Sign In </strong></a>
</div>
</div>
</div>
</div>
</div>
<div id = "footer" class="container-fluid text-center">
<p>INFO</p>
</div>
</body>
</html>
register.php
<?php
$sbuidreg = isset($_POST['sbuid']) ? htmlspecialchars($_POST['sbuid']):"NA";
$passreg = isset($_POST['pass']) ? htmlspecialchars($_POST['pass']):"NA";
$stuNamereg = isset($_POST['stuName']) ? htmlspecialchars($_POST['stuName']):"NA";
$emailIDreg = isset($_POST['emailID']) ? htmlspecialchars($_POST['emailID']):"NA";
$contactInforeg = isset($_POST['contactInfo']) ? htmlspecialchars($_POST['contactInfo']):"NA";
$myserver = "127.0.0.1:3306"
$database = "tcpscheduler";
$password = "rootpassword";
$username = "root";
// Connect to database
$con = mysqli_connect($myserver, $username, $password, $database);
if ($con->connect_error) {
die("Connection failed: " . $con->connect_error);
}
mysqli_query($con,"INSERT INTO `loginsection` VALUES('$sbuidreg', '$passreg','$stuNamereg', '$emailIDreg','$contactInforeg')") or die("Strange Error");
echo "Account Created";
mysqli_close($con);
header('Location: index.html');
?>