JavaScript gives us a set of 8 error objects, which are raised in a try/catch expression depending on the error type. They are:

JavaScript为我们提供了8个错误对象的集合，这些对象会根据错误类型在try / catch表达式中引发。 他们是：

• Error

  Error

• EvalError

  EvalError

• RangeError

  RangeError

• ReferenceError

  ReferenceError

• SyntaxError

  SyntaxError

• TypeError

  TypeError

• URIError

  URIError

I analyzed them all in the tutorial.

我在教程中对它们进行了分析。

Here I want to explain how to create your own custom errors by extending the base Error class:

在这里，我想解释如何通过扩展基本Error类来创建自己的自定义错误：

class OutOfFuelError extends Error {}class FlatTireError extends Error {}

Custom errors allow you to behave differently based on the specific error type, without resorting to use error messages to understand the kind of error.

自定义错误使您可以根据特定的错误类型采取不同的行为，而无需借助错误消息来了解错误的类型。

try {  //some code} catch (err) {  if (err instanceof OutOfFuelError) {    //handle error  } else if (err instanceof FlatTireError) {    //handle error  }}

Before you can do so, of course the error must be explicitly thrown in your code:

当然，在执行此操作之前，必须在代码中明确抛出该错误：

try {  const car = new Car() //imagine we have a Car object  if (!car.fuel) {    throw new OutOfFuelError('No fuel!')  }  if (car.flatTire) {    throw new FlatTireError('Flat tire!')  }} catch (err) {  if (err instanceof OutOfFuelError) {    //handle error  } else if (err instanceof FlatTireError) {    //handle error  }}

During the error creation you can also customize anything related to the class, even customizing the parameters received by the constructor if you need:

在错误创建期间，您还可以自定义与类相关的任何内容，甚至在需要时还可以自定义构造函数收到的参数：

class OutOfFuelError extends Error {  constructor(message) {    super(message)    this.name = "OutOfFuelError"  } }

翻译自: