list:[
0:Array(n)
old:[
    0:{id: 31, productName: "Old123", stockPrice: 20, …}
    1:{id: 32, productName: "Old123", stockPrice: 10, …}
    ...
 ],
new:[
    0:{id: 33, productName: "new123", stockPrice: 20, …}
    1:{id: 34, productName: "new123", stockPrice: 10, …}
    ...
 ],
1:Array(n)
old:[
    0:{id: 35, productName: "Old123", stockPrice: 20, …}
    1:{id: 36, productName: "Old123", stockPrice: 10, …}
    ...
 ],
new:[
    0:{id: 37, productName: "new123", stockPrice: 20, …}
    1:{id: 38, productName: "new123", stockPrice: 10, …}
    ...
 ],
 ...
]

有一个嵌套的数组，我要将 old 中的内容push到一个新的数组 oldlist 将 new 中的内容push到 newlist 该如何做

oldlist:[
    0:[
        0:{id: 31, productName: "Old123", stockPrice: 20, …}
        1:{id: 32, productName: "Old123", stockPrice: 10, …}
        ...
    ],
    1:[
        0:{id: 35, productName: "Old123", stockPrice: 20, …}
        1:{id: 36, productName: "Old123", stockPrice: 10, …}
        ...
    ],
    ...
]
newList:[
    0:[
        0:{id: 33, productName: "new123", stockPrice: 20, …}
        1:{id: 34, productName: "new123", stockPrice: 10, …}
        ...
    ],
    1:[
        0:{id: 37, productName: "new123", stockPrice: 20, …}
        1:{id: 38, productName: "new123", stockPrice: 10, …}
        ...
    ],
    ...
]

我遍历 list 再分别遍历 old 和 new 并进行push得到的是这样的数组

oldlist:[
    0:{id: 31, productName: "Old123", stockPrice: 20, …}
    1:{id: 32, productName: "Old123", stockPrice: 10, …}
    2:{id: 35, productName: "Old123", stockPrice: 20, …}
    3:{id: 36, productName: "Old123", stockPrice: 10, …}
    ...
]

ps：系统要求修改图片内容，改着改着发现新问题了--|||