ReferenceError
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.prototypeAllows the addition of properties to anReferenceErrorobject.
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.constructorSpecifies the function that created an instance's prototype.
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) |
