layui select多选下拉显示 以及多值回显

<div class="layui-form-item">
            <label class="layui-form-label"><em>*em>币种label>
            <div class="layui-input-block promotion-type">
                <select name="currency_id" lay-filter="currency" xm-select="currs" lay-search="" xm-select-search>
                    {volist name="currency" id="c"}
                    <option value="{$c.id}" data-type="{$c.id}">【{$c.id}】.{$c.name}option>
                    {/volist}
                select>
            div>
			<input type="hidden" id="hiddenCurr" name="hiddenCurr" value="{$globalInfo['currency_id']}">
        div>