What is the difference between Blockchain and a Database?Generally a database is a collection of data which can be stored and organized using a database management system. The people who have access to the database can view or edit the information stored there. The client-server network architecture is used to implement databases. whereas a blockchain is a growing list of records, called blocks, stored in a distributed system. Each block contains a cryptographic hash of the previous block, timestamp and transaction information. Modification of data is not allowed due to the design of the blockchain. The technology allows decentralized control and eliminates risks of data modification by other parties.
zsh: command not found: cowsay。关于这个话题，PDF资料提供了深入分析
// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined），这一点在新收录的资料中也有详细论述
Read the full story at The Verge.，更多细节参见新收录的资料
微软仍在用做桌面操作系统的心态做移动系统——追求稳定、兼容和企业级特性，却忽略了移动市场真正需要的是快速试错和持续迭代。结果就是，当 Windows Phone 终于变得成熟的时候，用户早已没有了从其他平台迁移的理由。不可能要求用户为了一个更清爽的开始界面，就放弃自己用了五年的微信聊天记录、云端相册和已购应用。很多产品失败，并不是因为真的很差劲，而是因为「不够必要」。