9.8.3 货币换算实例

        // 显示选单，并让用户选择换算的目的货币

        <select name="endCur">

            <option value="USD">USD</option>

            <option value="DMark">D-Mark</option>

            <option value="Franc">Franc</option>

            <option value="Lira">Lira</option>

        </select>

    </p>

    </card>

    // 第3个卡片valCard

    <card id="valCard">

        <onevent type="onenterforward">

            <refresh>

                // 变量cur和ans刷新，即初始化

                <setvar name="cur" value=""/>

                <setvar name="ans" value=""/>

            </refresh>

        </onevent>

    <p>

        <do type="accept" label="conv">