nevalek's questions

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43314748
1

如何计算以秒为单位的时差？这个单位来自哪里？

let data = 3200
let start = 0, end = 500;
for (let  i = 0; i < Math.ceil(data.length / 500); i++){
await addDb(data.slice(start,end))
start += 500
end += 500
}

async function addDb(data){
console.log('addDB', data.length)
for await (const coin of data) {
    await mongoCollection.replaceOne({
        exchange: coin.exchange,
        symbol: coin.symbol
    }, coin, {upsert: true});
}
}

如何并行运行多个 addDB 函数，以便每个函数写入部分行？使用await，它会一项一项地运行，如果没有await，它不会等待条目，代码会继续工作。

const mongoClient = new MongoClient("mongodb://localhost:27017/");
await mongoClient.connect();

const mongoCollection = mongoClient.db(DB).collection(COLLECTION);

let coins = []

//получение данных 
coins.push(coin)

async function addBD(){
  console.log(coins.length)
  coins = removeDuplicates(coins)
  console.log("Без дубликатов ", coins.length)
  for (const coin of coins){
    await mongoCollection.replaceOne({ exchange: coin.exchange,
      symbol: coin.symbol }, coin, {upsert: true});
  }
  coins = []
  console.log(coins.length)
}

setInterval(()=>{
  addBD()
}, 5000)

如何让函数在循环完成后运行？不使用间隔。

async function addBD(){
  console.log(coins.length)
  coins = removeDuplicates(coins)
  console.log("Без дубликатов ", coins.length)
  for (const coin of coins){
    await mongoCollection.replaceOne({ exchange: coin.exchange, symbol: coin.symbol }, coin, {upsert: true});
  }
  coins = []
  console.log(coins.length)
  addBD()
}

我这样做了，但出现错误“超出最大调用堆栈大小”