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const createTimeoutPromise = (callback, timeMs) => { return new Promise((resolve) => { setTimeout(() => { resolve(callback()); }, timeMs); }); }; const func2 = async () => { await createTimeoutPromise(() => { console.log(1); }, 300); await createTimeoutPromise(() => { console.log(2); }, 200); await createTimeoutPromise(() => { console.log(3); }, 100); }; const func3 = () => { const promises = []; promises.push( createTimeoutPromise(() => { // console.log(1); return 1; }, 300) ); promises.push( createTimeoutPromise(() => { // console.log(2); return 2; }, 200) ); promises.push( createTimeoutPromise(() => { // console.log(3); return 3; }, 100) ); return Promise.all(promises).then((results) => { results.forEach((result) => console.log(result)); }); }; const measureMs = async (func) => { const startTime = Date.now(); await func(); const endTime = Date.now(); const lapseMs = endTime - startTime; return lapseMs; }; const main = async () => { console.log('lapseMsFunc2: ' + (await measureMs(func2))); console.log('lapseMsFunc3: ' + (await measureMs(func3))); }; main(); |
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1 2 3 lapseMsFunc2: 605 1 2 3 lapseMsFunc3: 300 |
