9.4.8 操作input的value值

HTML

    <form action="">
            <input type="radio" name="sex"  value="112" />男
            <input type="radio" name="sex"  value="11" checked="" />女
            <input type="radio" name="sex"  value="11" />gay

            <input type="checkbox" value="a" checked=""/>吃饭
            <input type="checkbox" value="b" checked=""/>睡觉
            <input type="checkbox" value="c" checked=""/>打豆豆

            <select name="timespan" id="timespan" class="Wdate"   >  
                <option value="1">8:00-8:30</option>  
                <option value="2">8:30-9:00</option>  
                <option value="3">9:00-9:30</option>  
            </select>  
            <input type="text" name="" id="" value="111" />
    </form>

JS

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