ReferenceError

概述

ReferenceError(引用错误) 对象代表当一个不存在的变量被引用时发生的错误。

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.prototype (en-US)
Allows the addition of properties to an ReferenceError object.

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

{{page('/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError/prototype', 'Properties')}}

方法

{{page('/en-US/docs/Web/JavaScript/Reference/Global_Objects/ReferenceError/prototype', 'Methods')}}

例子

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"
}

例: 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

规范 状态 说明
ECMAScript 3rd Edition. Standard Initial definition.
ECMAScript 5.1 (ECMA-262)
ReferenceError
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
ReferenceError
Standard  

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相关链接