JavaScript 可以在运行时被 动态注入 ，这意味着你可以快速原型化新功能，而 不需要编写并部署一个完整的 Druid 扩展（extension） ——不需要重新编译 JAR、不需要重启集群节点、不需要走完整的扩展加载链路。对于探索性分析、临时逻辑验证、小规模定制等场景，这种"热注入"能力极具吸引力。

本内容遵循CC 4.0 BY-SA版权协议 在JavaScript中，函数声明和函数表达式虽然都能创建函数，但它们的底层机制存在根本性差异。函数声明（Function Declaration）是以 function 关键字开头，后跟函数名的独立语句；而函数表达式（Function Expression）则是作为表达式的一部分 ...

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