Map类型怎么转换成Json string

// ObjectUtil.ts 
export class ObjectUtil { 
static ObjectFromEntries(source: Iterable<readonly any[]>): Object { 
return Object.fromEntries(source) 
} 
} 
 
// .ets 
import { ObjectUtil } from ‘./ObjectUtil’; 
let map = new Map<string, string>() 
.set(‘key1’, ‘111’) 
.set(‘key2’, ‘222’); 
let jsonStr: string = JSON.stringify(ObjectUtil.ObjectFromEntries(map.entries())); 
hilog.info(0x0000, ‘testTag’, ‘map to json: %{public}s’, jsonStr);