样式修改不要全局，使用/deep/穿透
<el-form>
<el-form-item label="活动区域" class="change-label-calss">
<el-input v-model=""></el-input>
</el-form-item>
</el-form>
<style scoped>
.change-label-calss /deep/ .el-form-item__label{
color: red;
}
</style>
