11/24開會難點

 1 <script type="text/javascript">
 2            var num = 20;
 3            var obj = {
 4                   num: 30,
 5                   fn: (function(num){
 6                             this.num == 3;
 7                             num += 15;
 8                             var num = 45;
 9                             return function() {
10                                 this.num *= 4;
11                                 num += 20;
12                                 console.log(num);
13                             }
14                   })(num)
15            };
16            var fn = obj.fn;
17            fn();
18            obj.fn();
19            console.log(window.num);
20            console.log(obj.num);
21 </script>