javascript - Node js在循环node js中完成多个函数后执行另一个函数

Question

我的代码如下-:

function get_btc(address) {
    address_transaction(address, user_id, coin_key, deposite_txn_fee, function (callback) {
        for (var j = 0; j < callback.response.data.txs.length; j++) {
            let user_id = callback.user_id;
            //some code//
        }
    });
}

get_label_info(function (err, data) {
    var promise = [];
    for (var i = 0; i < data.length; i++) {
        let address = data[i].address;
        var test_function = function (done) {
            deposite_model.get_coin_info(function (err, data1) {
                var coin_name = data1[0].coin_code;
                const return_functions = get_switch(coin_name);
                if (return_functions) {
                    obj[return_functions](address);
                }
                done(err, data1);
            });
        };
        promise.push(test_function);
    }
    sample();
});

function sample() {
    console.log('all functions has been completed');
}

借助上述代码，我想在所有功能完成后执行 all_completed 循环。在初始启动时，执行 get_label_info 函数，然后 Controller 继续执行 get_btc 函数。

请帮助我在所有函数完成运行后如何运行 all_completed 函数。

Answer 1

试试这个，

在for循环外部定义test_function，在循环内部声明不是好方法。

var test_function = function (address) {
    return new Promise((resolve, reject) => {
        deposite_model.get_coin_info(function (err, data1) {
            if (err)
                return reject(err);
            var coin_name = data1[0].coin_code;
            const return_functions = get_switch(coin_name);
            if (return_functions) {
                obj[return_functions](address);
            }
            return resolve(data1);
        })
    })
}

get_label_info(function (err, data) {
    var promises = [];
    for (var i = 0; i < data.length; i++) {
        promises.push(test_function(address));
    }

    Promise.all(promises).then((data) => {
        sample();
    })
});


function sample() {
    console.log('all functions has been completed');
}