Javascript 如何处理程序的异步执行？

如何获得下面提到的异步函数的有序执行

文件

one.js

const request = require("request")

makerequest = function() {
    let value = false;

    request("http://www.google.com", function(err, response, body) {
        if(err)
            console.log("Error", err)
        else if(response && body)
        {
            console.log("response is valid")
            console.log("body is valid")
        }
        value = true
    })
    return value
}

exports.makerequest = makerequest

const one = require("./one")

post("passed string", function() {
    console.log("one")
    result = one.makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

const request = require("request")

makerequest = function() {
    let value = false;

    return new Promise(function(resolve, reject) {
        request("http://www.google.com", function(err, response, body) {
            if(err)
                console.log("Error", err)
            else if(response && body)
            {
                console.log("response is valid")
                console.log("body is valid")
            }
                value = true
                resolve(value)
        })
    })
}

module.exports = makerequest

const makerequest = require("./one")

post("passed string", async function() {
    console.log("one")
    result = await makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

文件

two.js

const request = require("request")

makerequest = function() {
    let value = false;

    request("http://www.google.com", function(err, response, body) {
        if(err)
            console.log("Error", err)
        else if(response && body)
        {
            console.log("response is valid")
            console.log("body is valid")
        }
        value = true
    })
    return value
}

exports.makerequest = makerequest

const one = require("./one")

post("passed string", function() {
    console.log("one")
    result = one.makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

const request = require("request")

makerequest = function() {
    let value = false;

    return new Promise(function(resolve, reject) {
        request("http://www.google.com", function(err, response, body) {
            if(err)
                console.log("Error", err)
            else if(response && body)
            {
                console.log("response is valid")
                console.log("body is valid")
            }
                value = true
                resolve(value)
        })
    })
}

module.exports = makerequest

const makerequest = require("./one")

post("passed string", async function() {
    console.log("one")
    result = await makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

这就是我得到的结果

passed string
one
result false
two
response is valid
body is valid

这就是我想要得到的结果

passed string
one
response is valid
body is valid
result true
two

---

我也尝试过使用

async/await

，但也没有成功。

这就是我所做的，以获得所需的输出

one.js

const request = require("request")

makerequest = function() {
    let value = false;

    request("http://www.google.com", function(err, response, body) {
        if(err)
            console.log("Error", err)
        else if(response && body)
        {
            console.log("response is valid")
            console.log("body is valid")
        }
        value = true
    })
    return value
}

exports.makerequest = makerequest

const one = require("./one")

post("passed string", function() {
    console.log("one")
    result = one.makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

const request = require("request")

makerequest = function() {
    let value = false;

    return new Promise(function(resolve, reject) {
        request("http://www.google.com", function(err, response, body) {
            if(err)
                console.log("Error", err)
            else if(response && body)
            {
                console.log("response is valid")
                console.log("body is valid")
            }
                value = true
                resolve(value)
        })
    })
}

module.exports = makerequest

const makerequest = require("./one")

post("passed string", async function() {
    console.log("one")
    result = await makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

two.js

const request = require("request")

makerequest = function() {
    let value = false;

    request("http://www.google.com", function(err, response, body) {
        if(err)
            console.log("Error", err)
        else if(response && body)
        {
            console.log("response is valid")
            console.log("body is valid")
        }
        value = true
    })
    return value
}

exports.makerequest = makerequest

const one = require("./one")

post("passed string", function() {
    console.log("one")
    result = one.makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

const request = require("request")

makerequest = function() {
    let value = false;

    return new Promise(function(resolve, reject) {
        request("http://www.google.com", function(err, response, body) {
            if(err)
                console.log("Error", err)
            else if(response && body)
            {
                console.log("response is valid")
                console.log("body is valid")
            }
                value = true
                resolve(value)
        })
    })
}

module.exports = makerequest

const makerequest = require("./one")

post("passed string", async function() {
    console.log("one")
    result = await makerequest()
    console.log("result", result)
    console.log("two")
})

function post(str, callback) {
    console.log(str)
    callback()
}

---

然而，有一件事我仍然没有得到。当我编写

resolve（value）

outside

request

函数调用时，承诺的行为不符合预期。对此有什么解释？它仍然在

Promise

的可能副本中，我试图按照答案进行操作，但仍然没有得到答案。请您帮助我了解如何才能达到预期的输出？我知道javascript的异步特性，但我不知道在这种情况下如何使用async/Wait或Promissions。很抱歉，这太宽泛了，因为您给出的代码只是一个假设的示例，您试图理解异步代码是如何工作的。我建议您在处理async/Wait之前先了解承诺。承诺更容易理解，一旦您准备好了，它与async/Wait later兼容。@jered您能回答我在回答中提出的问题吗？因为只有在实际可用时才应该使用最终值调用

resolve（）

。如果您在

request（）

调用之外调用它，您将在

request（）

实际完成其网络请求并检索数据之前同步触发

resolve（）

调用。不过，您自己解决问题做得很好：）