ReferenceError

当引用当前作用域中不存在（或尚未初始化）的变量时，ReferenceError 对象表示错误。

¥The ReferenceError object represents an error when a variable that doesn't exist (or hasn't yet been initialized) in the current scope is referenced.

ReferenceError 是 serializable object，因此可以使用 structuredClone() 进行克隆，或者使用 postMessage() 在工人之间进行复制。

¥ReferenceError is a serializable object, so it can be cloned with structuredClone() or copied between Workers using postMessage().

ReferenceError 是 Error 的子类。

¥ReferenceError is a subclass of Error.

构造函数

¥Constructor

ReferenceError(): 创建一个新的 ReferenceError 对象。

实例属性

¥Instance properties

还从其父级 Error 继承实例属性。

¥Also inherits instance properties from its parent Error.

这些属性在 ReferenceError.prototype 上定义并由所有 ReferenceError 实例共享。

¥These properties are defined on ReferenceError.prototype and shared by all ReferenceError instances.

ReferenceError.prototype.constructor: 创建实例对象的构造函数。对于 ReferenceError 实例，初始值为 ReferenceError 构造函数。
ReferenceError.prototype.name: 表示错误类型的名称。对于 ReferenceError.prototype.name，初始值为 "ReferenceError"。

实例方法

¥Instance methods

从其父级 Error 继承实例方法。

¥Inherits instance methods from its parent Error.

示例

¥Examples

捕获引用错误

¥Catching a ReferenceError

try {
  let a = undefinedVariable;
} catch (e) {
  console.log(e instanceof ReferenceError); // true
  console.log(e.message); // "undefinedVariable is not defined"
  console.log(e.name); // "ReferenceError"
  console.log(e.stack); // Stack of the error
}

创建引用错误

¥Creating a ReferenceError

try {
  throw new ReferenceError("Hello");
} catch (e) {
  console.log(e instanceof ReferenceError); // true
  console.log(e.message); // "Hello"
  console.log(e.name); // "ReferenceError"
  console.log(e.stack); // Stack of the error
}

规范

Specification
ECMAScript Language Specification # sec-native-error-types-used-in-this-standard-referenceerror

¥Specifications

浏览器兼容性

BCD tables only load in the browser

¥Browser compatibility

也可以看看

¥See also

Error