scope是html和单个controller之间的桥梁，数据绑定就靠他了。
rootscope是各个controller中scope的桥梁。用rootscope定义的值，可以在各个controller中使用。
直接上代码
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>scope</title>
<script src="../js/angular.js"></script>
</head>
<body>
<div ng-controller="TestCtrl">
$root.name是<strong>{{$root.name}}</strong>
</div>
<div ng-controller="Test111Ctrl">
$root.name是<strong>{{name}}</strong><br>
$scope.name是<strong>{{$root.name}}</strong>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('TestCtrl',function($scope,$rootScope) {
$rootScope.name = 'this is test';
}
);
app.controller('Test111Ctrl',function($scope,$rootScope) {
$scope.name = $rootScope.name;
}
);
</script>
</body>
</html>
注意一点：在html代码里面用$root取$rootScope的属性方法