微信小程序修改data数据的方法

Page({
  data: {
    person: {
      "name": "人",
      "age": 20
    }
  },
  onLoad: function() {
    var person = this.data.person;
    person.age = 18;
    this.setData({
      person
    })
  }
})

onLoad: function() {
  this.setData({
    "person.age": 25
  })
}