HarmonyOS 鸿蒙Next tag.unregisterForegroundDispatch参考demo无法运行查询不到日志

HarmonyOS 鸿蒙Next tag.unregisterForegroundDispatch参考demo无法运行查询不到日志

这是demo文档链接

[https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V14/js-apis-nfctag-V14#tagunregisterforegrounddispatch10](https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V14/js-apis-nfctag-V14#tagunregisterforegrounddispatch10)

tag.unregisterForegroundDispatch回调函数中的日志查询不到。

```javascript
import { tag } from '[@kit](/user/kit).ConnectivityKit';

import { BusinessError } from '[@kit](/user/kit).BasicServicesKit';

import { AbilityConstant, UIAbility, Want, bundleManager } from '[@kit](/user/kit).AbilityKit';

let discTech : number[] = [tag.NFC_A, tag.NFC_B]; // replace with the tech(s) that is needed by foreground ability

let elementName : bundleManager.ElementName;

function foregroundCb(err : BusinessError, tagInfo : tag.TagInfo) {
    if (!err) {
        console.log("foreground callback: tag found tagInfo = ", JSON.stringify(tagInfo));
    } else {
        console.log("foreground callback err: " + err.message);
        return;
    }
    // other Operations of taginfo
}

export default class MainAbility extends UIAbility {
    OnCreate(want : Want, launchParam : AbilityConstant.LaunchParam) {
        console.log("OnCreate");
        elementName = {
            bundleName: want.bundleName as string,
            abilityName: want.abilityName as string,
            moduleName: want.moduleName as string
        }
    }

    onForeground() {
        console.log("onForeground");
        try {
            tag.registerForegroundDispatch(elementName, discTech, foregroundCb);
        } catch (e) {
            console.error("registerForegroundDispatch error: " + (e as BusinessError).message);
        }
    }

    onBackground() {
        console.log("onBackground");
        try {
            tag.unregisterForegroundDispatch(elementName);
        } catch (e) {
            console.error("registerForegroundDispatch error: " + (e as BusinessError).message);
        }
    }

    onWindowStageDestroy() {
        console.log("onWindowStageDestroy");
        try {
            tag.unregisterForegroundDispatch(elementName);
        } catch (e) {
            console.error("registerForegroundDispatch error: " + (e as BusinessError).message);
        }
    }
    // override other lifecycle functions
}