深层次选择器

>>> /deep/ ::v-deep

<style scoped>
>>> .deep-level-selector{
  color: gray;
}
</style>

<style scoped>
/deep/ .deep-level-selector{
  color: gray;
}
</style>

<style scoped>
::v-deep .deep-level-selector{
  color: gray;
}
</style>