Ndef NFCAdapter.getNdef()
基础库 2.11.2 开始支持，低版本需做兼容处理。
以 Promise 风格 调用：不支持
小程序插件：支持
获取Ndef实例，实例支持对NDEF格式的NFC标签上的NDEF数据的读写
返回值
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