error.message 属性是错误的字符串描述,通过调用 new Error(message) 设置。 传给构造函数的 message 也会出现在 Error 的堆栈跟踪的第一行。 但是, Error 对象创建后改变这个属性可能不会改变堆栈跟踪的第一行(比如当 error.stack 在该属性被改变之前被读取)。

const err = new Error('错误信息');
// 打印: 错误信息

The error.message property is the string description of the error as set by calling new Error(message). The message passed to the constructor will also appear in the first line of the stack trace of the Error, however changing this property after the Error object is created may not change the first line of the stack trace (for example, when error.stack is read before this property is changed).

const err = new Error('The message');
// Prints: The message