在外层包一层div
<div v-if="commodDialogForm">
<el-dialog
:before-close="handleDialogClose"
:visible.sync="commodDialogForm"
title=""
center
:append-to-body='true'
:lock-scroll="false">
<commod @commodData="commodData" @close="closeCommodDialog"></commod>
</el-dialog>
</div>