Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

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

SyntaxError: identifier starts immediately after numeric literal - JavaScript

当标识符以数字开头时，JavaScript 会出现“identifier starts immediately after numeric literal”的异常。标识符只能以字母、下划线（_）或美元符号（$）开头。

SyntaxError: Unexpected identifier after numeric literal (Edge)
SyntaxError: identifier starts immediately after numeric literal (Firefox)
SyntaxError: Unexpected number (Chrome)

变量的名称（也称为标识符）需遵循特定的规则，而这些规则是你的代码必须遵循的！

JavaScript 标识符必须以字母、下划线（_）或美元符号（$）开头。不能以数字开头！只有后续的字符可以是数字（0-9）。

在 JavaScript 中，变量名不能以数字开头。以下表达式会失败：

const 1life = "foo";
// SyntaxError: identifier starts immediately after numeric literal

const foo = 1life;
// SyntaxError: identifier starts immediately after numeric literal

alert(1.foo);
// SyntaxError: identifier starts immediately after numeric literal

你需要重新命名变量以避免前导数字。

const life1 = "foo";
const foo = life1;

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4