Two same name variables

In https://github.com/Khan/khan-exercises/blob/master/khan-exercise.js

there are two var Khan variables. How come? Do th开发者_JS百科ey affect each other?

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One Khan is the name of the global variable "Khan", the other is a variable inside the self executing function that it is equal to.

var Khan = (function(){

    ....

    var Khan = ...

    ....

})();

The indentation in the source file is horrible and you probably did not notice that....

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variables wrapped in anonymous functions only work inside that function.

So this should work okay.

<script type="text/javascript">
$(function(){
   var khan = (function(){
        var khan = //this should not be a problem and they both work, this will be only available in the function
   }); 
});
</script>