解決方法

1.去掉scoped

<style></style>

2.額外寫一組style

</style lang="scss" scoped>

</style>

<style>

::v-deep .textarea-placeholder {
?? ??? ??? ??? ??? ?font-size: 24rpx;
?? ??? ??? ??? ??? ?font-weight: 400;
?? ??? ??? ??? ??? ?// color: rgba(176, 184, 194, 1);
?? ??? ??? ??? ??? ?color: red;
?? ??? ??? ??? ?}

</style>

3.樣式穿透

scss

::v-deep .textarea-placeholder {
?? ??? ??? ??? ??? ?font-size: 24rpx;
?? ??? ??? ??? ??? ?font-weight: 400;
?? ??? ??? ??? ??? ?// color: rgba(176, 184, 194, 1);
?? ??? ??? ??? ??? ?color: red;
?? ??? ??? ??? ?}

less

/deep/ .textarea-placeholder {
?? ??? ??? ??? ??? ?font-size: 24rpx;
?? ??? ??? ??? ??? ?font-weight: 400;
?? ??? ??? ??? ??? ?// color: rgba(176, 184, 194, 1);
?? ??? ??? ??? ??? ?color: red;
?? ??? ??? ??? ?}