// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）
It’s like your computer’s hard drive. blockchain is a technology that lets you store data in digital blocks, which are connected together like links in a chain.
。业内人士推荐夫子作为进阶阅读
if (currentStep.type === 'Success' || currentStep.type === 'Failure') {，这一点在搜狗输入法下载中也有详细论述
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