尝试用 ::v-deep 替换 /deep/ ,成功解决了问题。
但是后续发现,控制台给出了这样的提示:::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selecto
意思上边的语法已经废弃了,需要把::v-deep后边的选择器放在一个括号了: