您可能对null和undefined之间的区别感到困惑，例如：
const { dogName = 'snickers' } = { dogName: undefined }console.log(dogName) // what will it be? 'snickers'!const { dogName = 'snickers' } = { dogName: null }console.log(dogName) // what will it be? null!const { dogName = 'snickers' } = { dogName: false }console.log(dogName) // what will it be? false!const { dogName = 'snickers' } = { dogName: 0 }console.log(dogName) // what will it be? 0!摘自：http :
//wesbos.com/destructuring-default-values/
