In app.js
'use strict'// run 的作用表示初始化执行，也就是所以页面加载之前执行angular.module('app',['ui.router']).run(['$rootScope',function($rootScope){
//比如说我们在所有页面初始化执行之前添加一个im属性，那么之后创建的所有$scope对象因为都是它的子孙对象，都会有im这样的属性
$rootScope.im = function(){
console.log('im');
}
}]);This is the biggest role of $rootScope, which is equivalent to defining public functions and variables. However, we still recommend using services to generally define public functions.
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