The problem that the column is not displayed due to the embedded Datagrid in tab in EasyUI

RT
A Datagrid, column embedded in a tab is not displayed directly, while a column that is not embedded in Tab can be displayed normally. Why is this?
"< div title= "attachment upload" style= "padding: 10pxwords textignal: center;position:relative;" >

    <div style="border: 1px solid grey;width: 100%;height: 95%">
        <table class="easyui-datagrid" title="" style="width:95%;height:350px;margin: auto"
               data-options="singleSelect:true">
            <thead>
            <tr>
                <th data-options="field:"itemid",width:80">Item ID</th>
                <th data-options="field:"productid",width:100">Product</th>
                <th data-options="field:"listprice",width:80,align:"right"">List Price</th>
                <th data-options="field:"unitcost",width:80,align:"right"">Unit Cost</th>
                <th data-options="field:"attr1",width:250">Attribute</th>
                <th data-options="field:"status",width:60,align:"center"">Status</th>
            </tr>
            </thead>
        </table>
    </div>"

display effect

clipboard.png

Apr.09,2021
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