async包 ES6 async/await的区别

最基本的async 包

ApCollection.find({}).toArray(function (err, aps) {
        var num = 0;
        async.whilst(
            function () {
                return num++ < aps.length;
            },
            function (callback) {
                if (aps[num]) {
                    var apmac = aps[num].AP_MAC;
                    ApHeartCollection.findOne({ AP_MAC: apmac, time: { $gte: nowtime } }, function (err, log) {
                        ApCollection.update({ _id: aps[num]._id }, { $set: { c: 2 } }, function (err, doc) {
                            callback();

                        })
                    })
                }
                else {
                    callback();
                }
            },
            function (err) {
                console.log(‘finish  server status update‘);
            })
    })

用 async/await+promise

async function changeApServerStatus() {
    var nowtime = new Date().getTime() / 1000;
    var pro = tool.GetDB();
    await pro;
    await pro.then(function(args: any) {
        return new Promise(function(resovle, reject) {
            args.db.collection(‘ap‘).distinct(‘mac‘, function(err, macs) {
                if (!err) {
                    args.macs = macs;
                    resovle(args);
                }
                reject(err);
            })
        })
    }).then(function(args: any) {
        var macs: Array<string> = args.macs
        var num = 0;
        var ApCol = args.db.collection(‘ap‘)
        return myasync.whilst(
            function() { return num < macs.length; },
            function() {
                return new Promise(function(resovle, reject) {
                    ApCol.findOne({ mac: macs[num] }, function(err, ap) {
                        num++;
                        if (!err) {
                            resovle(ap);
                        }
                        reject(err);
                    })
                }).then(function(ap: any) {
                    console.log(num)
                    if (ap.datastatus == 0) {
                        console.log("is 0")
                        return new Promise(function(resovle, reject) {
                            ApCol.update({ mac: ap.mac }, { $set: { c: 2 } }, function(err, doc) {
                                console.log("update " + doc);
                                resovle(doc)
                            })
                        })
                    }
                    console.log("is 1")
                })
            }
        )
    })
}

async/await迭代器实现

var whilst = async function(test, callback) {
    while (test()) {
        await callback();
    }
    return "end"
};

async的迭代器

function whilst(fntest, fniterator, fnend) {
        if (fntest()) {
            fniterator(function (err) {
                if (err) {
                    fnend(err)
                }
                whilst(fntest, fniterator, fnend)
            })
        } else {
            fnend()
        }
    }