如何在JavaScript中声明全局变量 [英] How to declare a global variable in JavaScript

问题描述

如何在JavaScript中声明全局变量?

How can I declare a global variable in JavaScript?

推荐答案

如果必须在生产代码中生成全局变量(应避免使用)，则始终声明明确 >:

If you have to generate global variables in production code (which should be avoided) always declare them explicitly:

window.globalVar = "This is global!";

虽然可以通过省略var来定义一个全局变量(假设没有同名的局部变量)，但这样做会生成一个 implicit 全局变量，这是一件坏事会在严格模式中产生错误.

While it is possible to define a global variable by just omitting var (assuming there is no local variable of the same name), doing so generates an implicit global, which is a bad thing to do and would generate an error in strict mode.

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