Michael Dell did it. The founders of Proof did it. Even our incubator prototypes products with Kickstarter campaigns. If customers pay before launch, demand is validated and you’re building what people want now.
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。关于这个话题，heLLoword翻译官方下载提供了深入分析
每月領薪日，他第一件事就是到便利商店繳費。「那是一大筆費用，但這就是規矩，不付錢就沒有工作機會。工作到現在，我才剛還完信用貸款，根本還沒開始賺錢。」
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）