Question

115

rated 0 times [ 118] [ 3] / answers: 1 / hits: 128825 / 11 Years ago, thu, july 11, 2013, 12:00:00

I met this issue sometimes but still don't know what causes it.

I have this script in the page:

$(function(){

    var value = 10;

});

But the browser says ReferenceError: value is not defined. However if I go to the browser console and input either

or

var value = 10;

either of them can return 10. What is the problem with my script?

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answered 11 Years ago grant · Accepted Answer

It's declared inside a closure, which means it can only be accessed there. If you want a variable accessible globally, you can remove the var:

$(function(){

    value = 10;

});

value; // 10

This is equivalent to writing window.value = 10;.