Set “this” variable easily?

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There are two methods defined for all functions in JavaScript, call(), and apply(). The function syntax looks like:

call( /* object */, /* arguments... */ );
apply(/* object */, /* arguments[] */);

What these functions do is call the function they were invoked on, assigning the value of the object parameter to this.

var myFunction = function(){
    alert(this.foo_variable);
}
myFunction.call( document.body );

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