如何仅在没有表的情况下增加p-dataTable标题栏的长度
<p-dataTable class="pc-datatable" [value]="detailList" dataKey="code" expandableRows="true" [loading]="isLoading"
expandedIcon="ui-icon-expand-less" collapsedIcon="ui-icon-expand-more" [(selection)]="dArray[i]">
<p-column expander="true" [style]="{'width':'3%'}"></p-column>