树表默认展开所有行的属性：

default-expand-all = true

<maTable

        ref="table"

        :api="api"

        :column="column"

        :showRecycle="true"

        row-key="id"

        :hidePagination="true"

        @selection-change="selectionChange"

        @switch-data="switchData"

        stripe

        remoteSort

				default-expand-all = true

      >