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我们通过定义一个count来监听,当所有的异步返回时,我们统一处理res。
let count = 0; let res = {}; const done = function(key, val) { res[key] = val; count ++; if(count === 3) { render(res); } }; fs.readFile(template_path, 'utf8', (err, tp) => { done('tp', tp); }); db.query(sql, (err, data) => { done('data', data); }); $.get(demo.json, (err, res) => { done('res', res); });
var after = function(times, callback) { var count = 0,res = {}; return function(key, val) { res[key] = val; count ++; if(count == times) { callback(res); } } }
let promise1 = new Promise(function (resolve) { resolve(1); }); let promise2 = new Promise(function (resolve) { resolve(2); }); let promise3 = new Promise(function (resolve) { resolve(3); }); Promise.all([promise1, promise2, promise3]).then(function (res) { console.log(res); });
Promise.prototype.all = function (promises) { let results = []; let promiseCount = 0; let promisesLength = promises.length; return new Promise(function (resolve, reject) { for (let val of promises) { Promise.resolve(val).then(function (res) { promiseCount++; results[i] = res; if (promiseCount === promisesLength) { return resolve(results); } }, function (err) { return reject(err); }); } }); };
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多异步协作
异步操作
哨兵变量
Promise.all使用
Promise.all自己实现
The text was updated successfully, but these errors were encountered: