What is the Correct way to declare Global Variable in Java Script ?

Question

Please provide some sample code.I need to take copied data's from clipboard .Any one help me to solve this .

Answer 1

The proper way is to use window object.

And use the syntax like this:

var window.iAmGlobal = "some val"; //Global variable declaration with window.

//Any place in other part of code

function doSomething()
{
    alert(window.iAmGlobal); //I am accessible here too !!
    //OR
    alert(iAmGlobal); //I am accessible here too !!
}

By defining globals this way, you will make JavaScript more robust and reliable.

Note:

Define global variables with window keyword in form of “window.VAR_NAME”
You can access the variable with “window.VAR_NAME” or directly “VAR_NAME”
Do not use other variables with same name otherwise it may cause unwanted results