Angular 打字稿对象属性显然不是未定义但属性是

Question

我遇到了一个相当荒谬的问题。

来自订阅的可观察对象的对象在打印到控制台时清楚地包含数据，但在实际的打字稿代码中，表示其未定义。

自己看看：

initData(): void {

    this.backendService.getData().subscribe((depotDays: DepotDayAcc[]) => {

      console.log(depotDays)
      console.log(depotDays[0])
      console.log(depotDays[0].investment)
      console.log(depotDays[0]["day"])

      console.log('depotDays[0] == undefined', depotDays[0] == undefined)
      console.log('depotDays[0].investment == undefined', depotDays[0].investment == undefined)
    })
}

constructor(
    public day: Date,
    public investment: number = -1,
    public profit: number = 0,
    public value: number = 0,
    public percent: number = 0,
    public tickers: Set<string> = new Set<string>()) {
}

Answer 1

正如 ShamPooSham 在他的评论中指出的那样，您的数据都是字符串。你有一个字符串数组，而不是对象。

const depotDay = JSON.parse(depotDays[0]);
console.log(depotDay.investment);

选择要么修复有效负载，使其正确反序列化，要么自行反序列化每个条目。

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