Error(错误)


Node.js 应用程序一般会遇到以下四类错误:

  • 标准的 JavaScript 错误,例如 <EvalError><SyntaxError><RangeError><ReferenceError><TypeError><URIError>
  • 由底层操作系触发的系统错误,例如试图打开不存在的文件、或试图使用已关闭的 socket 发送数据。
  • 由应用程序代码触发的用户自定义的错误。
  • AssertionError 错误,当 Node.js 检测到不应该发生的异常逻辑时触发。这类错误通常来自 assert 模块。

所有由 Node.js 引起的 JavaScript 错误与系统错误都继承自或实例化自标准的 JavaScript <Error> 类,且保证至少提供类中的属性。

Applications running in Node.js will generally experience four categories of errors:

  • Standard JavaScript errors such as <EvalError>, <SyntaxError>, <RangeError>, <ReferenceError>, <TypeError>, and <URIError>.
  • System errors triggered by underlying operating system constraints such as attempting to open a file that does not exist or attempting to send data over a closed socket.
  • User-specified errors triggered by application code.
  • AssertionErrors are a special class of error that can be triggered when Node.js detects an exceptional logic violation that should never occur. These are raised typically by the assert module.

All JavaScript and System errors raised by Node.js inherit from, or are instances of, the standard JavaScript <Error> class and are guaranteed to provide at least the properties available on that class.