* @param arr 待排序数组
Eshell’s primary disadvantage shows when a program attempts to
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* @param {string} num 非负整数的字符串形式（可能含前导零）。业内人士推荐WPS官方版本下载作为进阶阅读
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This is the intuition the new API tries to preserve: streams should feel like iteration, because that's what they are. The complexity of Web streams — readers, writers, controllers, locks, queuing strategies — obscures this fundamental simplicity. A better API should make the simple case simple and only add complexity where it's genuinely needed.