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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Errors/Deprecated_octal_literal below:

SyntaxError: "0"-prefixed octal literals are deprecated - JavaScript

仅在 JavaScript 严格模式下出现的异常“0-prefixed octal literals are deprecated; use the "0o" prefix instead”在使用了已被弃用的八进制字面量（0 后跟数字）时出现。

SyntaxError: Octal literals are not allowed in strict mode. (V8-based)
SyntaxError: Decimals with leading zeros are not allowed in strict mode. (V8-based)
SyntaxError: Unexpected number (V8-based)
SyntaxError: "0"-prefixed octal literals are deprecated; use the "0o" prefix instead (Firefox)
SyntaxError: Decimal integer literals with a leading zero are forbidden in strict mode (Safari)

语法错误（SyntaxError），只出现于严格模式下。

八进制字面量已被弃用。在十进制整数前加上 0 时，实际上会将其转换为八进制字面量，这可能会令人感到惊讶。标准化的语法使用前导零后跟一个小写或大写的拉丁字母“O”（0o 或 0O）。

前导零总是被禁止的，即使字面量不是有效的八进制字面量语法（例如字面量包含数字 8 或 9，或者有小数点）。数字字面量仅在其值为 0 时才能以 0 开头。

"use strict";

03;

// SyntaxError: "0"-prefixed octal literals are deprecated; use the "0o" prefix instead

使用前导零后跟字母“o”或“O”：

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