HarmonyOS 请问如何把map转换为jsonstring

JSON.stringify不支持对Map操作，需要先将其转成Record。

// map转Record
let Rec:Record<string,ESObject> = {}
map.forEach((value:ESObject, key:string) => {
  if(value instanceof Map){//value可能为Map
    let vRec:Record<string,ESObject> = this.map2rec(value)
    value = vRec
  }
  Rec[key] = value
})
let str:string = JSON.stringify(Rec)