解决办法:
父级浮层设置:modal-append-to-body="false"属性,同时在子级浮层设置:modal-append-to-body="true" append-to-body属性
下面是子el-dialog,放在父el-dialog里面
<el-dialog title="子" :visible.sync="v1" :modal-append-to-body='true' :append-to-body='true'>
<img width="100%" :src="dialogImageUrl" alt="">
</el-dialog>
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参考资料:
https://blog.csdn.net/qq_38382380/article/details/102798489
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