JavaScript参考手册
错误 | Errors
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.prototype
Allows the addition of properties to anReferenceError
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 thatReferenceError
should provide its ownmessage
property, inSpiderMonkey, it inheritsError.prototype.message
.
ReferenceError.prototype.name
Error name. Inherited fromError
.
ReferenceError.prototype.fileName
Path to file that raised this error. Inherited fromError
.
ReferenceError.prototype.lineNumber
Line number in file that raised this error. Inherited fromError
.
ReferenceError.prototype.columnNumber
Column number in line that raised this error. Inherited fromError
.
ReferenceError.prototype.stack
Stack 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) |
错误 | Errors相关
JavaScript 是一种高级编程语言,通过解释执行,是一门动态类型,面向对象(基于原型)的解释型语言。它已经由ECMA(欧洲电脑制造商协会)通过 ECMAScript 实现语言的标准化。它被世界上的绝大多数网站所使用,也被世界主流浏览器( Chrome、IE、FireFox、Safari、Opera )支持。JavaScript 是一门基于原型、函数先行的语言,是一门多范式的语言,它支持面向对象编程,命令式编程,以及函数式编程。它提供语法来操控文本、数组、日期以及正则表达式等,不支持 I/O,比如网络