<!-- 写法1:使用::v-deep -->
<style lang="scss" scoped>
::v-deep .ant-card-head-titlef
background: yellowgreen;
</style>
<!-- 写法2:使用>>>操作符 -->
<style scoped>
>>>.ant-card-head-titlef
background: yellowgreen;
</style>
<!-- 写法3:使用/deep/ -->
<style scoped>
/deep/.ant-card-head-titlef
background: yellowgreen;
</style>
<!-- 写法1:使用:deep(<inner-selector>) -->
<style lang="scss" scoped>
:deep( .ant-card-head-titlejf
background: yellowgreen;
</style>
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