概述
ReferenceError(引用错误) 对象表明一个不存在的变量被引用。
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
ReferenceErrorobject.
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
ReferenceErrorshould provide its ownmessageproperty, 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
| 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) |