1 <script>
 2     f = function () {
 3         return true
 4     };
 5     g = function () {
 6         return false
 7     };
 8     (function () {
 9         if (g() && [] == ![]) {
10             f = function f() {
11                 return false;
12             };
13             function g() {
14                 return false
15             };
16         }
17     })();
18     alert(f());   //true  or false?
19 </script>