ReferenceError: variable is not defined

Question

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

I have this script in the page:

$(function(){
    var value = \"10\";
});
         


        

Answer 1

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";.