runPromisesInSeries.md

标题	标签
runPromisesInSeries(连续运行期约)	function,promise(函数，期约)

连续运行期约。

• 使用 Array.prototype.reduce() 创建承诺链，其中每个承诺在解决后返回下一个承诺。

const runPromisesInSeries = ps =>
  ps.reduce((p, next) => p.then(next), Promise.resolve());

调用方式:

const delay = d => new Promise(r => setTimeout(r, d));
runPromisesInSeries([() => delay(1000), () => delay(2000)]);
// Executes each promise sequentially, taking a total of 3 seconds to complete

应用场景