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

SyntaxError: "x" is a reserved identifier - JavaScript

SyntaxError: "x" is a reserved identifier (Firefox)
SyntaxError: Unexpected reserved word (Chrome)

保留字 用作标记符将会出错。这些标记符在严格模式和非严格模式下保留：

• enum

以下标记符只会在严格模式下才作为保留字：

• implements
• interface
• let
• package
• private
• protected
• public
• static

在两种模式下，enum 标识符都会作为保留字。

var enum = { RED: 0, GREEN: 1, BLUE: 2 };
// SyntaxError: enum is a reserved identifier

在严格模式下，会有更多的保留字。

"use strict";
var package = ["potatoes", "rice", "fries"];
// SyntaxError: package is a reserved identifier

你需要对上述变量重新命名。

var colorEnum = { RED: 0, GREEN: 1, BLUE: 2 };
var list = ["potatoes", "rice", "fries"];

假如你还在使用尚未支持 let 或 class 等特性的旧版本浏览器，你应该将它们升级到支持这些新语言特性的版本。

"use strict";
class DocArchiver {}

// SyntaxError: class is a reserved identifier
//（只会在旧版本浏览器中抛出，例如 Firefox 44 或更老的版本）

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