HarmonyOS 鸿蒙Next api12 nfc 前台识别标签失败

let discTech : number[] = [
TagType.NFC_A, TagType.NFC_B, TagType.NFC_F, TagType.NFC_V,
TagType.ISO_DEP, TagType.NDEF, TagType.NDEF_FORMATABLE, TagType.MIFARE_CLASSIC, TagType.MIFARE_ULTRALIGHT
];

export class ReadNfc {
private elementName: bundleManager.ElementName | undefined = undefined
private AbilityInfo: bundleManager.AbilityInfo | undefined = undefined
constructor() {
}
// 注册对NFC Tag读卡事件的监听，实现前台应用优先分发的目的
registerNfc() {
let want = AppStorage.get(‘want’) as Want
this.elementName = {
bundleName: want.bundleName as string,
abilityName: want.abilityName as string,
moduleName: want.moduleName
}
console.log(<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(<span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.elementName))
tag.registerForegroundDispatch(<span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.elementName, discTech, <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.foregroundCb);
<span class="hljs-comment"><span class="hljs-comment">// tag.on('readerMode', this.elementName, discTech, this.foregroundCb)</span></span>
console.log(<span class="hljs-string"><span class="hljs-string">'注册nfc监听'</span></span>)
}
// 取消注册对NFC Tag读卡事件的监听，退出前台应用优先分发
unRegisterNfc() {
tag.unregisterForegroundDispatch(this.elementName);
}
foregroundCb(err : BusinessError, tagInfo : tag.TagInfo) {
console.log(JSON.stringify(err))
if (err as BusinessError) {
if (!err) {
console.log("foreground callback: tag found tagInfo = ", JSON.stringify(tagInfo));
} else {
console.log("foreground callback err: " + (err as BusinessError).message);
return;
}
}
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

这些打印的nfc的相关内容全是undefined

syscap文件也加了， module.json5也配置了，权限都给了