Question

我想返回一个带有日期键和2个属性的对象：保证金和顾问。

!(moment(timesheet.date).format('YYYY') in this.grossMargin) ?
  this.grossMargin[moment(timesheet.date).format('YYYY')] = timesheet.invoice.total - timesheet.purchase.total :
  this.grossMargin[moment(timesheet.date).format('YYYY')] += timesheet.invoice.total - timesheet.purchase.total

this.grossMargin返回一个对象，其中年份作为键，grossMargin作为值。现在，我想在对象中添加另一个元素，例如顾问的总数。

我尝试了这个，但这不起作用：

if (!(moment(timesheet.date).format('YYYY') in this.grossMargin)) {
  this.grossMargin[moment(timesheet.date).format('YYYY')].margin = timesheet.invoice.total - timesheet.purchase.total
  this.grossMargin[moment(timesheet.date).format('YYYY')].consultant = consultant.invoice.total - consultant.purchase.total
} else {
  this.grossMargin[moment(timesheet.date).format('YYYY')].margin += timesheet.invoice.total - timesheet.purchase.total
  this.grossMargin[moment(timesheet.date).format('YYYY')].consultant += consultant.invoice.total - consultant.purchase.total
}

错误：无法设置未定义的属性'margin'

Answer 1

您需要首先定义this.grossMargin ['2018']（例如）。

if (!(moment(timesheet.date).format('YYYY') in this.grossMargin)) {
  this.grossMargin[moment(timesheet.date).format('YYYY')] = {};
  this.grossMargin[moment(timesheet.date).format('YYYY')].margin = timesheet.invoice.total - timesheet.purchase.total
  this.grossMargin[moment(timesheet.date).format('YYYY')].consultant = consultant.invoice.total - consultant.purchase.total
} else {
  // here this.grossMargin[moment(timesheet.date).format('YYYY')] is defined, 
  // but you need to make sure it's an object first
  this.grossMargin[moment(timesheet.date).format('YYYY')].margin += timesheet.invoice.total - timesheet.purchase.total
  this.grossMargin[moment(timesheet.date).format('YYYY')].consultant += consultant.invoice.total - consultant.purchase.total
}

Answer 2

采用这部分代码

if (!(moment(timesheet.date).format('YYYY') in this.grossMargin))

好吧，让我们将moment（timesheet.date）.format（'YYYY'）称为键。您正在检查！（this.grossMargin中的键），然后尝试通过执行this.grossMargin [key] .margin来设置未定义对象的边距。如果要初始化对象，应该做

this.grossMargin[key] = { 
  margin: value, 
  consultant: value 
}

具有多个属性的对象

2 个答案: