# 智能合约开发

**代码即律法（Code is law）。**

智能合约丰富了区块链技术的适用范围，让分布式账本支持大规模的商业应用成为可能。

区块链应用开发者不光需要理解业务逻辑，还要能够开发智能合约和用户应用。超级账本 Fabric 的链码支持主流编程语言如 Go、Java、Node，并提供了链码开发框架，简化了分布式应用的开发过程。

本章将介绍 Fabric 链码的基本概念、结构和核心 API，并通过案例演示如何实现典型区块链应用，最后还介绍了外部链码机制，讨论了应用开发的最佳实践。通过本章学习，读者将掌握设计和开发链码的实践技巧。

> 本目录中的 `chaincode_example*.go` 是章节级独立示例，为便于阅读保留在同一目录下，部分示例会复用 `SmartContract`、`main` 等符号。不要在本目录直接运行 `go test ./...`；如需检查某个示例，请按单文件运行，例如 `go test chaincode_example01.go`，或将示例复制到独立链码工程中验证。


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