ReferenceError() ã³ã³ã¹ãã©ã¯ã¿ã¼
Baseline
Widely available
This feature is well established and works across many devices and browser versions. Itâs been available across browsers since 2015å¹´7æ.
ReferenceError ãªãã¸ã§ã¯ãã¯ãåå¨ããªãå¤æ°ãåç
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new ReferenceError([message[, fileName[, lineNumber]]])
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ReferenceError ã®ææ
js
try {
let 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"
}
ReferenceError ã®çæ
js
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"
}
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| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-nativeerror-constructors |