Question

我必须将多个用户数据发送到一个外部API，这不支持批量插入。所以我循环它并多次调用我的节点API，但收到错误。 [在此输入图像说明] [1]

  / calling api from service

var testArry =  [
{"name":"name1","id":"1" },
{"name":"name2","id":"2" },
{"name":"name3","id":"3" }
];

myAPIFunction(testArry).then(function (status) {
    console.log("Success: ", status);
}).catch(function (err) {
    console.log("ERROR : ", err);
})

// API Function

function myAPIFunction(options) { 
    for (var i in options) {
        return new Promise((resolve, reject) => {
            axios({
                method: "post",
                url: `https:test/url`, // External API to save data
                data: options[i].data
            }).then(function (err, res) {
                console.log("Success : Promise is resolved");
                Promise.resolve(res.data);
            }).catch(function (err) {
                console.log("ERROR : Promise is rejected ");
            })
        });
    } // End of loop
}

错误：

ERROR : TypeError: Cannot read property 'then' of undefined
    at C:\Users\IBM_ADMIN\git\PayGo\L1SupportAPI\routes\onboarding\index.js:141:55
    at nextTask (C:\Users\IBM_ADMIN\git\PayGo\L1SupportAPI\node_modules\async\dist\async.js:5310:14)
    at next (C:\Users\IBM_ADMIN\git\PayGo\L1SupportAPI\node_modules\async\dist\async.js:5317:9)
    at C:\Users\IBM_ADMIN\git\PayGo\L1SupportAPI\node_modules\async\dist\async.js:958:16
    at C:\Users\IBM_ADMIN\git\PayGo\L1SupportAPI\routes\onboarding\index.js:98:17
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
(node:1284) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Callback was already
 called.
(node:1284) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections
 that are not handled will terminate the Node.js process with a non-zero exit code.
ERROR : Promise is rejected
ERROR : Promise is rejected

Answer 1

你没有从那个函数返回任何东西，因此。然后就不存在了。

此外，你不必创造新的承诺，呼叫axios本身就是承诺：

var testArry =  [
{"name":"name1","id":"1" },
{"name":"name2","id":"2" },
{"name":"name3","id":"3" }
];

myAPIFunction(testArry).then(function (status) {
    console.log("Success: ", status);
}).catch(function (err) {
    console.log("ERROR : ", err);
})

// API Function

function myAPIFunction(options) { 
    const promises = [];
    for (var i in options) {
            const promise = axios({
                method: "post",
                url: `https:test/url`,
                data: options[i].data
            }).then(function (res) {
                console.log("Success : Promise is resolved");
                return res;
            }).catch(function (err) {
                console.log("ERROR : Promise is rejected ");
            })
        promises.push(promise)
    }
    return Promise.all(promises);
}

我试图在网址设置为http://google.com的情况下运行它并收到此输出：

ERROR : Promise is rejected
ERROR : Promise is rejected
ERROR : Promise is rejected
Success:  [ undefined, undefined, undefined ]

哪个是正确的，google.com不接受POST

未处理的承诺拒绝：错误：已经调用了回调

1 个答案: