Uncaught ReferenceError: app is not defined

Uncaught ReferenceError: app is not defined

angular.min.js:80 Error: [$injector:unpr] http://errors.angularjs.org/1.2.9/$injector/unpr?p0=uploadServiceProvider%20%3C-%20uploadService
    at angular.min.js:2
    at angular.min.js:28
    at Object.c [as get] (angular.min.js:26)
    at angular.min.js:28
    at c (angular.min.js:26)
    at d (angular.min.js:26)
    at Object.instantiate (angular.min.js:27)
    at angular.min.js:57
    at angular.min.js:45
    at q (angular.min.js:3)

代码正确,但就是页面无法正常显示, 原因很可能就是引入的js文件顺序有问题:

将基层js文件放在最上方即可: