<html><body><h1>input checked 属性</h1><form action="/demo/action_page.php" method="get"> <input type="checkbox" name="vehicle1" value="Bike"> <label for="vehicle1">我有一辆自行车</label><br> <input type="checkbox" name="vehicle2" value="Car"> <label for="vehicle2">我有一辆汽车</label><br> <input type="checkbox" name="vehicle3" value="Boat" checked> <label for="vehicle3">我有一艘船</label><br><br> <input type="submit" value="提交"></form></body></html>