如何使用javascript将数组从数组重构为单个数组

Question

const arr = [
[
{
_id: "6136096f4255d84bcb4a7144",
user_id: "5fbfa729fc46a415ce5503a6",
picture: [Array],
timestamp: 1630931311227,
},
user: {
_id: "5fbfa729fc46a415ce5503a6",
first_name: "ABC",
last_name: "AAA",
picture: [Object]
}
],
[
{
_id: "613609414255d84bcb4a7122",
user_id: "5fbf6f91aff7f3320a906547",
picture: [Array],
device_platform: 'ios',
timestamp: 1630931265409
},
user: {
_id: "5fbf6f91aff7f3320a906547",
first_name: 'EEE',
last_name: 'TTT',
picture: [Object]
}
],
[
{
_id: "613709f49223350dfdaec618",
user_id: "5fbfa748fc46a415ce5503a8",
picture: [Array],
timestamp: 1630996980379
},
{
_id: "613609184255d84bcb4a710a",
user_id: "5fbfa748fc46a415ce5503a8",
picture: [Array],
timestamp: 1630931224383,
},
user: {
_id: "5fbfa748fc46a415ce5503a8",
first_name: 'GRT',
last_name: 'GGG',
picture: [Object]
}
]
]

我合并push到对象一个像res = [{_id:…]， user_id:…}, {_id:…， user_id:…}]，另一个为user = {_id: 5fbfa748fc46a415ce5503a8, first_name: 'AAA'，last_name: 'DD'}

res。User = User;array.push (res)

我合并了两个对象，它带来了这个，但它似乎不是正确的响应。

当我使用var merged = [].concat。应用([],arr);它不工作

如何用正确的格式修复

Answer 1

工作代码!删除用户使用const/let而不是var

const arr = [
[
{
_id: "6136096f4255d84bcb4a7144",
user_id: "5fbfa729fc46a415ce5503a6",
picture: [Array],
timestamp: 1630931311227,
},
{
_id: "5fbfa729fc46a415ce5503a6",
first_name: "ABC",
last_name: "AAA",
picture: [Object]
}
],
[
{
_id: "613609414255d84bcb4a7122",
user_id: "5fbf6f91aff7f3320a906547",
picture: [Array],
device_platform: 'ios',
timestamp: 1630931265409
},
{
_id: "5fbf6f91aff7f3320a906547",
first_name: 'EEE',
last_name: 'TTT',
picture: [Object]
}
],
[
{
_id: "613709f49223350dfdaec618",
user_id: "5fbfa748fc46a415ce5503a8",
picture: [Array],
timestamp: 1630996980379
},
{
_id: "613609184255d84bcb4a710a",
user_id: "5fbfa748fc46a415ce5503a8",
picture: [Array],
timestamp: 1630931224383,
},
{
_id: "5fbfa748fc46a415ce5503a8",
first_name: 'GRT',
last_name: 'GGG',
picture: [Object]
}
]
]
const merged = [].concat.apply([], arr);
console.log(merged);