正则验证用户名和跨域postmessage

正则验证用户名

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form>
        <input type="text" pattern="[A-Za-z0-9]+" required title="用户名只能包含字母和数字">
        <input type="submit" value="提交">
      </form>
</body>
</html>

跨域postmessage

##----------------------------class03----------------------------------------------------
#index.html
<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2023</title>
</head>
    <div>
        <h1>www.test1.com</h1>
    </div>
</body>
<script>
    window.addEventListener('message', (event) => {
        if (event.origin === 'http://www.class2.cn') {
            const cookieData = event.data;
            //处理cookieData
            console.log('Receive message from parent:', cookieData);
            window.parent.postMessage('child message', '*');
        }
    })
</script>
 
</html>
 
#web.php
<?php 
$pets = $_POST['pet-select'];
echo $pets;?>
##----------------------------class04----------------------------------------------------
#child.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Child</title>
</head>
<body>
    <h1>child-html</h1>
</body>
<script>
    console.log(document.cookie);
    alert(1);
</script>
</html>
 
#index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>iframe</title>
</head>
<body>
    <iframe id="myIframe" src="http://www.test1.com/" frameborder="0"></iframe>
</body>
<script>
    window.onload = function() {
        document.cookie = 'sessionid=class2'
        const cookieData = document.cookie
        window.frames[0].postMessage(cookieData, 'http://www.test1.com/');
    }
    //添加一个监听事件处理子页面的返回消息
    window.addEventListener('message', (event) => {
        if(event.origin === 'http://www.test1.com')
        console.log('Received message from child:', event.data);
    })
</script>
</html>