AngularJS自带指令 ng-include、ng-view、ng-switch、ng-repeat 以及人为添加的子controller，都是和directive实现方法一样，内部使用scope:true方式，子作用域继承了父级且构建了一个独立的子作用域，所有双向绑定实现不了，只能单独实现子级作用域继承父级的属性。
采用$scope.vm.key
AngularJS的继承是通过javascript的原型继承方式实现的，进行原型继承即意味着父作用域在子作用域的原型链上。因为原型链的检索只会在属性检索的时候触发，不会在改变属性值的时候触发。所以我们需要把原始类型转换成对象，把值绑定在对象的属性上。
例如:
var child={};
var parents={life:{name:'hello'}};
child.__proto__=parents;
child.life.name='ok';
console.log(parents.life.name)//ok
子继承父时,如果继承了一个对象,则对子的对象的修改也会影响到父,即完成了一次双向绑定
同理,
<!DOCTYPE html>
<html lang="en" ng-app="childScope">
<head>
<meta charset="UTF-8">
<title></title>
<script src="lib/angular.min.js" type="text/javascript"></script>
</head>
<body ng-controller="childCon">
<div class="inner">
<h3>父级作用域</h3>
<span>{{vm.private1}}</span>
<span>{{vm.private2}}</span>
</div>
<div class="outer">
<h3>自己作用域</h3>
<div class="one" ng-include src="'one.html'"></div>
<div class="two" ng-include src="'two.html'"></div>
</div>
</body>
<script>
var app=angular.module("childScope",['template'])
.controller("childCon",["$scope", function ($scope) {
var vm=$scope.vm={};
vm.private1=12;
vm.private2=13;
$scope.test=123;
}]);
var template=angular.module("template",[])
.run(["$templateCache", function ($templateCache) {
$templateCache.put("one.html","" +
"<div><input type='text' ng-model='vm.private1'/></div>")
}])
.run(["$templateCache", function ($templateCache) {
$templateCache.put("two.html","" +
"<div><input type='text' ng-model='vm.private2'/>" +
"<div class='sco'><span>原始类型</span>{{test}}</div>" +
"</div>")
}])
</script>
</html>
采用controller as
controller as其实相当于controller的示例对象，原理还是把原始类型转换成对象类型。
<!DOCTYPE html>
<html lang="en" ng-app="childScope">
<head>
<meta charset="UTF-8">
<title></title>
<script src="lib/angular.min.js" type="text/javascript"></script>
</head>
<body ng-controller="childCon as vm">
<div class="inner">
<h3>父级作用域</h3>
<span>{{vm.private1}}</span>
<span>{{vm.private2}}</span>
</div>
<div class="outer">
<h3>自己作用域</h3>
<div class="one" ng-include src="'one.html'"></div>
<div class="two" ng-include src="'two.html'"></div>
</div>
</body>
<script>
var app=angular.module("childScope",['template'])
.controller("childCon",["$scope", function ($scope) {
this.private1=12;
this.private2=22;
$scope.test=123;
}]);
var template=angular.module("template",[])
.run(["$templateCache", function ($templateCache) {
$templateCache.put("one.html","" +
"<div><input type='text' ng-model='vm.private1'/></div>")
}])
.run(["$templateCache", function ($templateCache) {
$templateCache.put("two.html","" +
"<div><input type='text' ng-model='vm.private2'/>" +
"<div class='sco'><span>原始类型</span>{{test}}</div>" +
"</div>")
}])
</script>
</html>
使用$parent.name调用内部方法来实现。
AngularJS的作用域还存在如下内部定义的关系：
scope.$parent指向scope的父作用域；
scope.$$childHead指向scope的第一个子作用域；
scope.$$childTail指向scope的最后一个子作用域；
scope.$$nextSibling指向scope的下一个相邻作用域；
scope.$$prevSibling指向scope的上一个相邻作用域；
通过在子级作用域中使用scope.$parent.name，来获取对父级作用域的双向绑定。
<!DOCTYPE html>
<html lang="en" ng-app="childScope">
<head>
<meta charset="UTF-8">
<title></title>
<script src="lib/angular.min.js" type="text/javascript"></script>
</head>
<body ng-controller="childCon">
<div class="inner">
<h3>父级作用域</h3>
<span>{{private1}}</span>
<span>{{private2}}</span>
</div>
<div class="outer">
<h3>自己作用域</h3>
<div class="one" ng-include src="'one.html'"></div>
<div class="two" ng-include src="'two.html'"></div>
</div>
</body>
<script>
var app=angular.module("childScope",['template'])
.controller("childCon",["$scope", function ($scope) {
$scope.private1=12;
$scope.private2=22;
$scope.test=123;
}]);
var template=angular.module("template",[])
.run(["$templateCache", function ($templateCache) {
$templateCache.put("one.html","" +
"<div><input type='text' ng-model='$parent.private1'/></div>")
}])
.run(["$templateCache", function ($templateCache) {
$templateCache.put("two.html","" +
"<div><input type='text' ng-model='$parent.private2'/>" +
"<div class='sco'><span>原始类型</span>{{test}}</div>" +
"</div>")
}])
</script>
</html>
