* @param arr 待排序数组
Владимир Бабушкин (Вася Бриллиант)，这一点在雷电模拟器官方版本下载中也有详细论述
Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
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