使用Binance的Node.js API获取交易品种的未结订单数量 [英] Get number of open orders for a symbol using Binance's Node.js API

问题描述

我正在使用Binance的 Node.js API.它说到获取符号的未结订单"，我应该这样做:

I am using Binance's Node.js API. It says regarding "Get open orders for a symbol", I should do:

binance.openOrders("ETHBTC", (error, openOrders, symbol) => {
  console.info("openOrders("+symbol+")", openOrders);
});

要打印出未结订单数量，请执行以下操作:

To print out number of open orders, I do:

binance.openOrders("ETHBTC", (error, openOrders, symbol) => {
  console.info(openOrders.length);
});

有效，并打印出数字.但是，我需要将此结果存储在一个变量中，以后可以由其他函数使用.我建立在 SO的Java聊天室上，

which works and the number gets printed out. However, I would need this result to be stored in a variable which can be used later by other functions. Building on SO's Javascript chat room, I do:

let OO =
(async() => {
  const openOrders = await binance.openOrders(false);
  return openOrders.length
})()
console.log(OO)

但这会打印

Promise { <pending> }

仅.

我还看到了其他几个讨论 Promise {< pending>} 问题，但我无法针对此特定情况实施他们的解决方案.

I have seen several other questions discussing Promise { <pending> } issue but I haven't been able to implement their solutions to this specific case.

如何将未结订单数量转化为其他功能可以访问的变量?

How could I get number of open orders into a variable accessible by other functions?

推荐答案

您将需要使用完全异步的方法或使用回调.

You'll need to use either completely async approach or use callbacks.

问题中的最后一个方框准确地显示了此答案所解释的内容.Javascript不等待 Promise 在同步上下文中解析/拒绝.因此，您的异步"块返回了未解决的 Promise ，并且您的其余(同步)代码没有等待其解决.

The last block in your question shows exactly what this answer explains. Javascript doesn't wait for Promise to resolve/reject in a synchronous context. So your "async" block returned the unresolved Promise and the rest of your (synchronous) code didn't wait for it to resolve.

使用异步函数的示例

const getOpenOrdersCount = async () => {
    const openOrders = await binance.openOrders("ETHBTC");
    return openOrders.length;
};

const run = async () => {
    const openOrdersCount = await getOpenOrdersCount();
    console.log(openOrdersCount);
}

注意:您只能在 async 函数中使用 await .

Note: You can use await only within async functions.

使用回调的示例是您的代码.它们在较小范围内很有用，但在较大范围内会变得混乱，并变成回调地狱.因此，我不建议在更大范围内使用回调.

Example of using callbacks is your code. They are useful in a small scope, but in bigger scope they get messy and turn into a callback hell. So I wouldn't recommend using callbacks in a bigger scope.

binance.openOrders("ETHBTC", (error, openOrders, symbol) => {
  console.info(openOrders.length);

  // here goes rest of your code that needs to use the `openOrders` variable
});

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