Question

我希望在await循环结束后在扫描函数中调用回调函数。我怎样才能做到这一点？

let personObj = {};
let personArray = [];

 async function scan() {
    for await (const person of mapper.scan({valueConstructor: Person})) {
        decrypt(person.name, function () {
            personArray.push(personObj);
        });            
    }
}

例如，我想在循环后调用console.log(personArray)。

Answer 1

您需要promisify the callback function在async函数中使用它：

function decryptAsync(value) {
    return new Promise(resolve => {
        decrypt(value, resolve);
    });
}
async function scan() {
    let personArray = [];
    for await (const person of mapper.scan({valueConstructor: Person})) {
        let personObj = await decryptAsync(person.name);
        personArray.push(personObj);
    }
    console.log(personArray)
}

如何在等待循环结束后调用回调函数

1 个答案: