arr.push(p.val); // 存储节点值而非节点本身，简化后续操作
“If your goal is to get development done, providing as much detail and tutorializing and onboarding processes, making that as simple as possible is going to get you your best results,” said Mort. “Because, again, if you aren’t gaining devs, you’re losing devs.”
，更多细节参见雷电模拟器官方版本下载
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* @return {number} - 最短无序连续子数组的长度，排序该子数组后整个数组升序