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" id="username" name="username" pattern="[A-Za-z0-9_-]{6,16}" required>
        <input type="submit" value="提交">
        <div class="error-message">用户名的长度在6-16字符之间由数字和字母组成</div>
      </form>
</body>
</html>

跨域postmessage

配置好虚拟主机


<!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>
 
<body>
    <div>
        <h1>www.sing.com</h1>
    </div>
</body>
<script>
    window.addEventListener('message', (event) => {
        if (event.origin === 'http://www.oupeng.com') {
            const cookieData = event.data;
            console.log('Receive message from parent:', cookieData);
            window.parent.postMessage('child message', '*');
        }
    })
</script>
</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.sing.com/" frameborder="0"></iframe>
</body>
<script>
    window.onload = function() {
        document.cookie = 'sessionid=oupeng'
        const cookieData = document.cookie
        window.frames[0].postMessage(cookieData, 'http://www.sing.com/');
    }
    window.addEventListener('message', (event) => {
        if(event.origin === 'http://www.sing.com')
        console.log('Received message from child:', event.data);
    })
</script>
</html>

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原文地址：https://blog.csdn.net/SssY_x/article/details/133771851