“我在 forEach 循环中在数组上添加一个属性。但是当我执行 console.log() 时，每个数组上的添加值始终是 foreach 循环的最后一个值。”
交付数据有位置，我想将位置传递给pickupDetails。
deliveries: [{ //data of deliveries that I want to pass in pickupDetails
0: {Location: Korea},
1: {Location: Japan}
}]
let pickupDetails = this.state.pickupDetails;
//pickupDetails is only one object then It will become two since the deliveries has 2 objects
pickupDetails = {
name: "June"
}
this.state.deliveries.forEach((delivery, index) => {
pickupDetails.location = delivery.location;
console.log(pickupDetails)
})
the result of the console:
pickupDetails = {
name: "June"
location: "Japan" //this should be Korea since the first loop data is korea
}
pickupDetails = {
name: "June"
index: "Japan"
}
我认为该代码中缺少某些内容可能是因为它的虚拟数据。好吧，从我的角度来看，您对 javascript 参考感到困惑。
deliveries: [{ //data of deliveries that I want to pass in pickupDetails
0: {Location: Korea},
1: {Location: Japan}
}]
let pickupDetails = this.state.pickupDetails;
this.state.deliveries.forEach((delivery, index) => {
let newPickupDetails = JSON.parse(JSON.stringify(pickupDetails));
newPickupDetails.location = delivery.location;
console.log(newPickupDetails);
})
the result of the console:
pickupDetails = {
name: "Juan"
location: "Japan" //this should be Korea since the first loop data is korea
}
pickupDetails = {
name: "June"
index: "Japan"
}
JSON.parse 和 JSON.stringify 我们用于创建新对象而不是使用引用。控制台日志受到影响，因为它通过引用链接，所以如果你使它成为新对象，它就会这样做。
检查变量 newPickupDetails
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