ReferenceError

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

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

ReferenceError.prototype.constructor

Specifies the function that created an instance's prototype.

ReferenceError.prototype.message

Error message. Although ECMA-262 specifies that ReferenceError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message .

ReferenceError.prototype.name

Error name. Inherited from Error .

ReferenceError.prototype.fileName

Path to file that raised this error. Inherited from Error .

ReferenceError.prototype.lineNumber

Line number in file that raised this error. Inherited from Error .

ReferenceError.prototype.columnNumber

Column number in line that raised this error. Inherited from Error .

ReferenceError.prototype.stack

Stack trace. Inherited from Error .

方法

Although the ReferenceError prototype object does not contain any methods of its own, ReferenceError instances do inherit some methods through the prototype chain.

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"
}