【nodejs中的对象和数组之间的操作】

假设两个对象

const obj1 = {
    "tokenId": "1",
    "uri": "ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/108",
    "name": "美女11111",
    "description": "很漂亮的美女1",
    "ipfsImage": "https://gateway.ipfscdn.io/ipfs/QmVUK37rqCFfgTj5t1ZsJUbTGv4EgAtsSuCbZD6hPv9SkD/0"
}
const obj2 = {
    "tokenId": "2",
    "uri": "ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/109",
    "name": "美女22222",
    "description": "很漂亮的美女2",
    "ipfsImage": "https://gateway.ipfscdn.io/ipfs/QmVUK37rqCFfgTj5t1ZsJUbTGv4EgAtsSuCbZD6hPv9SkD/1"
}

1.两个对象合并

const objA = {
       obj1,obj2
}
console.log('objA:',objA)

打印结果如下：

objA: {
  obj1: {
    tokenId: '1',
    uri: 'ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/108',
    name: '美女11111',
    description: '很漂亮的美女1',
    ipfsImage: 'https://gateway.ipfscdn.io/ipfs/QmVUK37rqCFfgTj5t1ZsJUbTGv4EgAtsSuCbZD6hPv9SkD/0'
  },
  obj2: {
    tokenId: '2',
    uri: 'ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/109',
    name: '美女22222',
    description: '很漂亮的美女2',
    ipfsImage: 'https://gateway.ipfscdn.io/ipfs/QmVUK37rqCFfgTj5t1ZsJUbTGv4EgAtsSuCbZD6hPv9SkD/1'
  }
}

2.通过循环将未知长度的对象（数组）追加到数组中

let arrObj = []
for(const key of Object.keys(objA)){
	let item = objA[key]
	let  obj = {}
	obj.tokenId=item.tokenId+""
	obj.uri=item.uri
	obj.name=item.name
	obj.description=item.description
	obj.ipfsImage=item.image
	// 添加对象到数组
	arrObj.push(obj)
}
console.log('arrObj:',arrObj)

打印结果如下：

[
        {
            "tokenId": "1",
            "uri": "ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/108",
            "name": "美女11111",
            "description": "很漂亮的美女1",
            "ipfsImage": "https://gateway.ipfscdn.io/ipfs/QmVUK37rqCFfgTj5t1ZsJUbTGv4EgAtsSuCbZD6hPv9SkD/0"
        },
        {
            "tokenId": "2",
            "uri": "ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/109",
            "name": "美女22222",
            "description": "很漂亮的美女2",
            "ipfsImage": "https://gateway.ipfscdn.io/ipfs/QmVUK37rqCFfgTj5t1ZsJUbTGv4EgAtsSuCbZD6hPv9SkD/1"
        }
    ]

3.将数组对象转为json字符串

const jsonStr = JSON.stringify(arrObj)
console.log('arrObj:',jsonStr)

打印结果如下：

arrObj: [{"tokenId":"1","uri":"ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/108","name":"美女11111","description":"很漂亮的美女1"},{"tokenId":"2","uri":"ipfs://QmU98cczjKdTf9AqtbNXZikNE7vhLS5693ULXKocJ2vEoi/109","name":"美
女22222","description":"很漂亮的美女2"}]