HarmonyOS 如何获取当前是否为深色模式

a等于0时为深色，1时为浅色，可以参考下面demo：

import { common, ConfigurationConstant } from '@kit.AbilityKit';

@Entry
@Component
struct Page7235 {
  @State message: string = 'Hello World';

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('Page7235HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          let context = getContext(this) as common.UIAbilityContext
          let a: ConfigurationConstant.ColorMode | undefined = context.config.colorMode
          console.log(a?.toString())
        })
    }
    .height('100%')
    .width('100%')
  }
}
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参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-app-ability-configuration-V5#%E5%B1%9E%E6%80%A7