向数组添加新值

Question

我想在JavaScript中的数组上添加新值。数组是这样的：

[
  0: { Id: 0,
       Name: "First",
       Time: "2020-06-08T11:12:03.003" },
  1: { Id: 1,
       Name: "Second",
       Time: "2020-06-08T11:12:03.003" }
]

这是一个简单的数组，我的数组更大，值更多。我想添加这样的新值：

[
  0: { Id: 0,
       Name: "First",
       Time: "2020-06-08T11:12:03.003",
       SecondTime: "2020-06-08T11:12:03.003" },
  1: { Id: 1,
       Name: "Second",
       Time: "2020-06-08T11:12:03.003",
       SecondTime: "2020-06-08T11:12:03.003"  }
]

我知道有很多类似的问题，但是我找不到解决问题的方法。

Answer 1

使用foreach

const data = [
   { Id: 0,
       Name: "First",
       Time: "2020-06-08T11:12:03.003" },
{ Id: 1,
       Name: "Second",
       Time: "2020-06-08T11:12:03.003" }
]

data.forEach(i=>{
 i.SecondTime = "2020-06-08T11:12:03.003"
});

console.log(data)

使用reduce：

const data = [
   { Id: 0,
       Name: "First",
       Time: "2020-06-08T11:12:03.003" },
{ Id: 1,
       Name: "Second",
       Time: "2020-06-08T11:12:03.003" }
]

var res = data.reduce((acc, elem)=>{
 elem.secondtime = elem.Time;
 acc.push(elem);
 return acc
},[]);

console.log(res)