js如何在json中存储函数

const stringify = (obj) => {
  try {
    return JSON.stringify(obj, (key, value) => {
      if(typeof value === 'function') {
        return `FUNCTION_FLAG ${value}`
      } else {
        return value
      }
    })
  } catch (error) {
    console.log(error)
    return '出错了'
  }
}

const parse = (jsonStr) => {
  try {
    return JSON.parse(jsonStr, (key, value) => {
      if(value && typeof value === 'string') {
        return value.indexOf('FUNCTION_FLAG') > -1 ? new Function(`return ${value.replace('FUNCTION_FLAG', '')}`)() : value
      }
      return value
    })
  } catch (error) {
    console.log(error)
    return '出错了'
  }
}

const obj = {
  name: '测试',
  num: 10,
  fn: (v) => {
    return v
  }
}
let str = stringify(obj)
let result = parse(str)
console.log(str)  // {"name":"测试","num":10,"fn":"FUNCTION_FLAG function fn(v) {\n        return v;\n      }"}
console.log(result)