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<!DOCTYPE html> <html> <body> <h1>select form 属性</h1> <p>form 属性指定下拉列表属于哪种形式：</p> <form action="/action_page.php" id="carform"> <label for="fname">Firstname:</label> <input type="text" id="fname" name="fname"> <input type="submit"> </form> <br> <label for="cars">选择一辆车：</label> <select id="cars" name="carlist" form="carform"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="opel">Opel</option> <option value="audi">Audi</option> </select> <p>下拉列表在表单元素之外定义，但将与表单一起提交。</p> </body> </html>