VUE中对object.object和object[object]的使用解读

const lineChartData = {
  newVisitis: {
    expectedData: ['2020-12-1', '2020-12-2', '2020-12-3', '2020-12-4', '2020-12-5', '2020-12-6', '2020-12-7'], //每日注册人数日期
    actualData: [120, 82, 91, 154, 162, 140, 145] //每日注册人数
  },
  messages: {
    expectedData: [200, 192, 120, 144, 160, 130, 140],
    actualData: [180, 160, 151, 106, 145, 150, 130]
  },
  purchases: {
    expectedData: [80, 100, 121, 104, 105, 90, 100],
    actualData: [120, 90, 100, 138, 142, 130, 130]
  },
  shoppings: {
    expectedData: [130, 140, 141, 142, 145, 150, 160],
    actualData: [120, 82, 91, 154, 162, 140, 130]
  }
}

 methods: {
    handleSetLineChartData(type) {
      console.log(type)
      console.log( lineChartData[type]," lineChartData[purchases]")
      console.log( lineChartData.purchases," lineChartData.purchases")
      this.lineChartData = lineChartData[type]
    }
  }