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<!DOCTYPE html> <html> <body> <h1>input pattern 属性</h1> <p>密码字段必须包含 8 个或更多字符的表单：</p> <form action="/action_page.php"> <label for="pwd">Password:</label> <input type="password" id="pwd" name="pwd" pattern=".{8,}" title="Eight or more characters"> <input type="submit"> </form> </body> </html>