代码
加入:append-to-body="true"就可以了
<el-dialog :title="title" :visible="shows" :append-to-body="true" width="30%" :before-close="handleClose">
<span>{{ "  "+ message }}</span>
<span slot="footer" class="dialog-footer">
<el-button type="primary" @click="handleClose">确 定</el-button>
</span>
</el-dialog>