ReferenceError

The ReferenceError object represents an error when a non-existent variable is referenced.

语法

new ReferenceError([message[, fileName[, lineNumber]]])

参数

message可选。描述可读的错误信息fileName可选。包含引起异常代码的文件名lineNumber可选。引起异常的代码行号

描述

当你尝试引用一个未被定义的变量时，将会抛出一个 ReferenceError。

属性

ReferenceError.prototypeAllows the addition of properties to anReferenceErrorobject.

方法

全局的 ReferenceError本身并不包含有方法，但是他可以从原型链上继承一些方法

ReferenceError实例

属性

ReferenceError.prototype.constructorSpecifies the function that created an instance's prototype.

ReferenceError.prototype.messageError message. Although ECMA-262 specifies thatReferenceErrorshould provide its ownmessageproperty, inSpiderMonkey, it inheritsError.prototype.message.

ReferenceError.prototype.nameError name. Inherited fromError.

ReferenceError.prototype.fileNamePath to file that raised this error. Inherited fromError.

ReferenceError.prototype.lineNumberLine number in file that raised this error. Inherited fromError.

ReferenceError.prototype.columnNumberColumn number in line that raised this error. Inherited fromError.

ReferenceError.prototype.stackStack trace. Inherited fromError.

方法

尽管ReferenceError原型对象本身不包含任何方法，但ReferenceError实例通过原型链继承了一些方法。

示例

捕获一个 ReferenceError

try {
  var 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.fileName);                  // "Scratchpad/1"
  console.log(e.lineNumber);                // 2
  console.log(e.columnNumber);              // 6
  console.log(e.stack);                     // "@Scratchpad/2:2:7\n"
}

创建一个 ReferenceError

try {
  throw new ReferenceError('Hello', 'someFile.js', 10);
} catch (e) {
  console.log(e instanceof ReferenceError); // true
  console.log(e.message);                   // "Hello"
  console.log(e.name);                      // "ReferenceError"
  console.log(e.fileName);                  // "someFile.js"
  console.log(e.lineNumber);                // 10
  console.log(e.columnNumber);              // 0
  console.log(e.stack);                     // "@Scratchpad/2:2:9\n"
}

规范

Specification	Status	Comment
ECMAScript 3rd Edition (ECMA-262)	Standard	Initial definition.
ECMAScript 5.1 (ECMA-262)The definition of 'ReferenceError' in that specification.	Standard	​
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'ReferenceError' in that specification.	Standard	​
ECMAScript Latest Draft (ECMA-262)The definition of 'ReferenceError' in that specification.	Living Standard	​

浏览器兼容性

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic Support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic Support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)