::v-deep usage as a combinator has been deprecated. Use `:deep(<inner-selector>)` instead.

【问题】

在使用 Vue 3 的时候，发现在 ::v-deep 深度选择器报错如下：

bash

::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead.

【解决】

原因是 Vue 3 中已经废弃了 ::v-deep，需要使用 :deep(<inner-selector>) 代替，如：

css

:deep(.demo) {
    background-color: red;
}

::v-deep usage as a combinator has been deprecated. Use :deep(<inner-selector>) instead. ​