Question

How can I use same instance of one particula .js across all .js functions

For eg: var test = new Test();

this test i need to use when ever I want to access Test() function(i.e same instance)

Answer 1

It depends a little on what exactly your code looks like, but:

window['test'] = new Test();

should generally do the trick. After that, any scripts in your page should be able to see “test” as a global variable, which is the same as being a property of the window object.