javascript - 帮助JavaScript警报 | 帮助JavaScript警报

function msg ($msg) {

 echo "<script type='text/javascript'>alert('$msg');</script>";


}

if (count($_POST)) {
   msg('TEST!!!!!');
}

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>My website</title>
<link rel="stylesheet" type="text/css" href="/assets/css/main.css" />
</head>
<body>

<div id="content">
<form action="/user/register" method="post">

<table cellspacing="2" cellpadding="0">
<tr>

 <td>Username:</td>
 <td><input name="username" maxlength="25" size="25" type="text" />
 </td>
</tr>

<tr>
 <td>E-mail:</td>
 <td><input name="email" maxlength="255" size="25" type="text" /></td>
</tr>

<tr>
 <td>Password:</td>
 <td><input name="password" maxlength="255" size="25" type="password" /></td>
</tr>

<tr>
 <td>Confirm password:</td>
 <td><input name="password2" maxlength="255" size="25" type="password" /></td>
</tr>

<tr>

 <td>&nbsp;</td>
 <td><input type="submit" value="Register" /></td>
</tr>

</table></div>

</body>
</html>

当我发贴时，当提示显示警告但在空白页上。当我按提交时，表格消失了。我该怎么办仍显示html？

消息弹出，但在空白页上。我希望它仍显示您的页面

最佳答案

首先，您需要将脚本放在标签中，而不是DOCTYPE上方。尝试这个

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>My website</title>
<link rel="stylesheet" type="text/css" href="/assets/css/main.css" />
<?php
if (count($_POST)) {
   msg('TEST!!!!!');
}
?>
</head>

在那之后，可能会有更多的问题。

关于javascript - 帮助JavaScript警报，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/1214172/