您可以尝试以下示例

const callbackFn = (firstName, callback) => {
setTimeout(() => {
if (!firstName) return callback(new Error('no first name 
passed in!'))

const fullName = `${firstName} Doe`

return callback(fullName)
  }, 2000)
}

callbackFn('John', console.log)
callbackFn(null, console.log)