Created
July 10, 2017 14:53
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| db.accounts.findById(id, function(error, user) { | |
| //....AAAA | |
| db.accounts.useUsertoDo(user, function(error, something) { | |
| // use something to do something | |
| }); | |
| }); | |
| //------------------------------ | |
| var promise1 = db.accounts.findById(id); | |
| var promise2 = user => { | |
| return db.accounts.useUsertoDo(user); | |
| }; | |
| promise1 | |
| .then(user => { | |
| //....AAAA | |
| return promise2(user); | |
| }) | |
| .then(something => { | |
| // use something to do something | |
| }) | |
| .catch(error => {}); | |
| //------------------------------ | |
| var promises = []; | |
| promises.push(db.accounts.findById(id)); | |
| promises.push(db.accounts.findByName1(name)); | |
| promises.push(db.accounts.findByName2(name)); | |
| var promiseLast = (id, name1, name2) => { | |
| return db.accounts.compareNameAndId(id, name1, name2); | |
| }; | |
| Promise.all(promises) | |
| .then(values => { | |
| var id = values[0]; | |
| var name1 = values[1]; | |
| var name2 = values[2]; | |
| return promiseLast(id, name1, name2); | |
| }) | |
| .then(something => {}) | |
| .catch(error => {}); | |
| // --------------------- | |
| function findById(_id, cb) { | |
| //.... | |
| if (error) { | |
| cb(error, null); | |
| } else { | |
| cb(null, data); | |
| } | |
| } | |
| // ---------------------- | |
| function findById(_id) { | |
| return new Promise(function(resolve, reject) { | |
| //.... | |
| if (error) { | |
| reject(error); | |
| } else { | |
| resolve(data); | |
| } | |
| }); | |
| } |
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