AngularJS下载：
https://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.min.js
https://ajax.googleapis.com/ajax/libs/angularjs/1.5.6/angular.js

哇，没想到这两个文件差别那么大，得有10倍大小
angular.js是未修改的human-readable适合Web开发者阅读的版本；而angular.min.js是用于生产环境的压缩版的mini版。

• angular.js — This is the human-readable,non-minified version,suitable for web development.
• angular.min.js — This is the minified version,which we strongly suggest you use in production.

➜  AngularJS/org master ✓ ll                                                                                                      [15:18:55]
total 2752
drwxr-xr-x  5 caiqiqi  staff   170B  5  9 15:18 ./
-rw-r--r--@ 1 caiqiqi  staff   1.1M  5  9 15:18 angular.js
-rw-r--r--@ 1 caiqiqi  staff   155K  5  9 15:18 angular.min.js
drwxr-xr-x  8 caiqiqi  staff   272B  5  9 15:13 ../
-rw-r--r--@ 1 caiqiqi  staff    85K  5  9 13:28 jquery.min.js