Can't set headers after they are sent
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Can't set headers after they are sent
nodejs+express中出现这个错误都在路由里,大部分是程序运行了res.xxx之后,后面还有和请求,响应相关的操作造成的.
主要是程序运行的先后顺序没理解透,也就是nodejs的一大特性 : 异步.初学者特别要注意.
-- 理解到了nodejs程序运行的先后顺序,这个问题就迎刃而解.
-- 还有就是res.xxx操作之后最好不要再有代码,就算是打印输出的代码也写在res.xxx之前,
-- 另外,nodejs程序就算res.xxx响应以后,程序还会继续执行,return下更好.
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