const userInfo = Object.assign(this.data.userInfo,{name : 'yuanshen' },{ age : 20})
    this.setData({
      userInfo
    })

const userInfo = Object.assign(this.data.userInfo,{name : 'yuanshen' },{ age : 20})

    this.setData({

      userInfo

    })

在使用以上方法时，出现以下结果

在微信小程序中TypeError: Cannot convert undefined or null to object at t.assign (<anonymous>) at li.updateUserInfo (cate.js:72) at Object.o.safeCallback (WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1) at WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1 at wn (WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1) at WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1 at pe (WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1) at de (WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1) at WASubContext.js?t=wechat&s=1741956367851&v=3.7.9:1 at WAServiceMainContext.js?t=wechat&s=1741956367851&v=3.7.9:1(env: Windows,mp,1.06.2412050; lib: 3.7.9)

可以将userInfo默认值设置为空

Page({
    data: {
        userInfo: {} // 默认值为空对象
    }
});

或设置一个默认值

data: {
  userInfo: {
    name:'tom',
    age:10

  } 
}

即可