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Editorial Team
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Asked: 2026-06-02T10:12:21+00:00

alert(010),the result is 8. why? i read the ecmascript 7.8.3 Numeric Literals. According to

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alert(010),the result is 8. why?
i read the ecmascript 7.8.3 Numeric Literals.
According to the Numeric Literals Lexical,
010 is a invalid numeric literals.

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1 Answer

  1. Editorial Team

    It’s only so when strict mode is turned on :

    (function(){
"use strict";
010;
})();
SyntaxError: Octal literals are not allowed in strict mode.

    Otherwise it would break backwards compatibility.

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