js中将map转成json

// 创建一个Map对象
let myMap = new Map();
myMap.set('key1', 'value1');
myMap.set('key2', 'value2');

// 将Map转换为对象
let obj = Object.fromEntries(myMap);

// 将对象转换为JSON字符串
let jsonStr = JSON.stringify(obj);

console.log(jsonStr); // 输出: {"key1":"value1","key2":"value2"}

function stringifyWithCircularReference(map) {
  const seen = new WeakSet();
  return JSON.stringify(map, (key, value) => {
    if (typeof value === 'object' && value !== null) {
      if (seen.has(value)) {
        return '[Circular]';
      }
      seen.add(value);
    }
    return value;
  });
}

let circularMap = new Map();
circularMap.set('self', circularMap);

let safeJsonStr = stringifyWithCircularReference(circularMap);
console.log(safeJsonStr); // 输出: {"self":"[Circular]"}