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JavaScript Global Variable

A JavaScript global variable is declared outside the function or declared with window object. It can be accessed from any function.

Let’s see the simple example of global variable in JavaScript.

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Declaring JavaScript global variable within function

To declare JavaScript global variables inside function, you need to use window object. For example:

Now it can be declared inside any function and can be accessed from any function. For example:

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Internals of global variable in JavaScript

When you declare a variable outside the function, it is added in the window object internally. You can access it through window object also. For example: