apply and call example

gistfile1.js

var x, o1, o2, r1, r2, r3;
x = 4;
o1 = {x: 2};
o2 = {x: 7};
 
f = function(m, n) {return m * n * this.x;};
 
r1 = f(3, 1)); 
r2 = f.call(o1,3, 1));
r3 = f.apply(o2,[3, 1]));