HarmonyOS 鸿蒙Next写入JSON文件时数据出现错误

export function createConfig(): void {
let config: Config = {
loginInfo: {
server: ‘’,
username: ‘’,
password: ‘’
},
autoLogin: false,
jumpTime: 10
}
// fs.unlinkSync(filesDir + ‘/config.json’)
let configStatus = fs.accessSync(filesDir + ‘/config.json’)
if (configStatus === true) {
console.log(“配置文件存在。”)
} else {
console.log(“配置文件不存在。”)
let file = fs.openSync(filesDir + ‘/config.json’, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
fs.writeSync(file.fd, JSON.stringify(config));
fs.closeSync(file);
}
console.log(“配置文件位置”, filesDir + ‘/config.json’)
}

export function readConfig(): Config {
let config: Config
let file = fs.openSync(filesDir + ‘/config.json’, fs.OpenMode.READ_WRITE)
let arrayBuffer = new ArrayBuffer(4096);
let readLen = fs.readSync(file.fd, arrayBuffer);
let buf = buffer.from(arrayBuffer, 0, readLen);
config = JSON.parse(buf.toString())
console.log(“读取配置”, JSON.stringify(config))
fs.closeSync(file);
return config
}
createConfig()
config = readConfig()
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

这样创建文件然后写入，再读取出来，结果变成了{“loginInfo”:{“server”:"",“username”:"",“password”:""},“a4”:false,“jumpTime”:10}

为什么autoLogin会变成a4？换成其他的比如remember也是一样，偶尔好像还会变成a5，为什么其他的就不会变？