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
-
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 ownmessage
property, in SpiderMonkey, it inheritsError.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" }
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 |
浏览器兼容性
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Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |