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