jQuery表单对象属性过滤选择器

    <div id="p1" attr="p1">
        <input type="text" id="in001" value="in001">
        <input type="text" id="in002" disabled="disabled" value="in002">
        <input type="checkbox" id="chk001" checked="checked" >
        <input type="checkbox" id="chk002" >
        <select id="slt001">
            <option>11</option>
        </select>
        <select id="slt002" multiple="multiple" size="5" >
            <option>21</option>
            <option selected="selected">22</option>
            <option>23</option>
            <option selected="selected">24</option>
            <option>25</option>
        </select>
    </div>