题解 | #双向绑定#

Object.keys(person).forEach(prop => {
  let oldValue = person[prop]

  Object.defineProperty(person, prop, {
	get() {
		return oldValue
	},
	set(value) {
	  oldValue = value
	  _render(ul)
	}
  })
})

inp.oninput = function () {
 	person.weight = this.value
}