模块化Javascript代码的两种方式

1.将模块整体放在函数里

 function buildMonthNameModule() {
     var names = ["January ", "February", "March", "April", "May ", "June ", "July", "August ", "September ", "October ", "November", "December"];
     function getMonthName(number) {
         return names[number];
     }
     function getMonthNumber(name) {
         for (var number = 0; number < names.length; number++) {
             if (names[number] == name) {
                 return number;
             }
         }
     }
     window.getMonthName = getMonthName;
     window.getMonthNumber = getMonthNumber;
 }
 buildMonthNameModule();

2.模块对象

 var days = (function() {
     var names = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];
     return {
         getDayName: function(number) {
             return names[number];
         },
         getDayNumber: function(name) {
             for (var number = 0; number < names.length; number++) {
                 if (names[number] == name) {
                     return number;
                 }
             }
         }
     };
 })();

http://eloquentjavascript.net/1st_edition/