异步编程--Promise其他方法
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1.Promise-all
Promise.all方法 多任务处理
Promise.all(iterable) iterable：包含多个 Promise 的迭代器对象，比如数组 当迭代器对象中的所有 Promise 状态都会 fulfilled/resolved 的时候，整体才是 fulfilled/resolved，否则就是 rejected
打印结果为
2.Promise-race
Promise.race方法 多任务处理
Promise.race(iterable) iterable：包含多个 Promise 的迭代器对象，比如数组 当迭代器对象中的首个任务完成（可以是fulfilled/resolved，也可能是 rejected）就会调用，并且状态取决于首个任务完成的状态
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