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<!DOCTYPE html> <html> <body> <h1>input pattern 属性</h1> <p>具有 URL 字段的表单必须以 http:// 或 https:// 开头，后跟至少一个字符：</p> <form action="/action_page.php"> <label for="website">主页:</label> <input type="url" id="website" name="website" pattern="https?://.+" title="Include http://"> <input type="submit"> </form> </body> </html>