错误：message

¥Value

与作为第一个参数传递给 Error() 构造函数的值相对应的字符串。

¥A string corresponding to the value passed to the Error() constructor as the first argument.

¥Description

此属性包含错误的简要描述（如果可用或已设置）。Error.prototype.toString() 方法使用 message 属性与 name 属性组合来创建错误的字符串表示形式。

¥This property contains a brief description of the error if one is available or has been set. The message property combined with the name property is used by the Error.prototype.toString() method to create a string representation of the Error.

默认情况下，message 属性是空字符串，但可以通过将消息指定为 Error 构造函数的第一个参数来覆盖实例的此行为。

¥By default, the message property is an empty string, but this behavior can be overridden for an instance by specifying a message as the first argument to the Error constructor.

¥Examples

¥Throwing a custom error

const e = new Error("Could not parse input");
// e.message is 'Could not parse input'
throw e;

¥See also

• Error.prototype.name
• Error.prototype.toString()