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<a-buttonicon="arrow-down"type="primary"shape="circle"style="margin-left:5px;":disabled="members.length == index + 1"@click="menberDown(index)"></a-button>
<a-buttonicon="arrow-down"type="primary"shape="circle"size="small"style="margin-left:5px;":disabled="members.length == index + 1"@click="menberDown(index)"></a-button>