Angularjs scope

$scope:

var myapp = angular.module('myapp', []);
  myapp

    .controller('parent', function ($scope,$timeout) {

      $scope.$broadcast('you');//已经发出广播

      $scope.$on('you', function (event) {

        console.log(event);//广播已经发出才进行监听，所以不会执行这一行

      });

    })
    .controller('child', function ($scope) {

      $scope.$on('you', function (event) {

        console.log(event);//同样不会执行

      });

    })

<div ng-controller="parent">

  <div ng-controller="middle">

    <div ng-controller="child"></div>

  </div>

</div>

var myapp = angular.module('myapp', []);

  myapp

    .controller('parent', function ($scope, $timeout) {

      var myevent=$scope.$on('you', function (event, data) {

        console.log(event);  //不会接收到通知
        console.log(data);　　//不会接收到通知

      });

　//myevent()可取消监听

}) 

.controller('middle', function ($scope, $timeout) { 

　　$scope.$on('you', function (event, data) { 
　　event.stopPropagation(); 

　　console.log(event); //event对象 

　　console.log(data);　 //'hello' }); 

　　$scope.$on('you', function (event, data) { 

　　console.log(event); //虽然已经调用了stopPropagation,但由于是在同一个scope内，所以仍然event对象 

　　console.log(data);　　//'hello' 

　　});  

})

.controller('child', function ($scope) { 

　　$scope.$on('you', function (event, data) { 

　　console.log(event); //event对象 
　　
　　console.log(data); //'hello' }); 

　　$scope.$emit('you', 'hello'); //会返回一个event对象 
})

stopPropagation只针对$emit, 如果使用$scope.$broadcast(‘you’) 给you事件发送广播,那么event对象里就不会有stopPropagation方法，即使在子scope再使用$scope.$emit(‘you’)发送消息，调用该方法仍然报错。

$destroy:

var onTimeout = function() {

        $scope.value += 1;
        timer = $timeout(onTimeout, 1000);

};

var timer = $timeout(onTimeout, 1000);

$scope.value = 0;

$new (new,parent):  传入new会创建隔离作用域（isolate scope）??parent

.controller('parent', function ($rootScope, $scope) {

      var child1 = $scope.$new();

      var child2 = child1.$new();

      $scope.a = 0;

      child1.a = 10;

      console.log(child2.a); //

      child2.$watch("a", function (newValue) {

        console.log(newValue); //执行change后 

      });

      $scope.change = function () {

        child2.a++;

        console.log(child1.a); //

      };

    })

$watch ( 'val', function ( newval, oldval, scope){ },boolean),

$watchGroup ( [ 'str1', 'str2' ] ,function ( newval, oldval, scope ))

$watchCollection ( obj ,function ( newval, oldval, scope ))

　　$watch 一般用来监听基本类型，监听对象时除非对象完全改变，也就是地址值发生改变，否则监听不到

　　$watchGroup会为数组中的每个变量添加一个$watch, 但只能浅监听，无法监听对象属性的改变，该属性主要是用来一次性为多个值添加浅监听

.controller('parent', function ($rootScope, $scope, $timeout) {

      $scope.one = {a: 1};

      $scope.two = {b: 2};

      $scope.th3 = {c: 3};

      $scope.arr = ['one', 'two'],
      $scope.$watchGroup($scope.arr, function (newval, oldval) {
　　　　//一旦监听某个数组，该数组就会被锁定，对该数组无论做任何修改都不会改变监控的对象

　　　　console.log('hi');

      })

      $scope.change = function () {

        $scope.arr[2] = 'th3';

        $scope.th3 = {};  //不起作用

      }

      $scope.change2 = function () {

        $scope.two = {};

      }

    })

　　　

.controller('parent', function ($rootScope, $scope, $timeout) {
  $scope.a=1;
  $scope.b=2;
  var cal=function(scope){
    return scope.a;
  }
  $scope.$watchGroup([cal],function(newval){
    console.log('hi');
  })
  $scope.change=function(){
    $scope.a++;
  }
})

　

　　

　　$watchCollection: 为对象或数组的属性添加浅监听，也就是只监听对象的一个层级

.controller('parent', function ($rootScope, $scope, $timeout) {

      $scope.one = {a: {aa: 1}};

      $scope.$watchCollection('one', function (newval, oldval) {

        console.log('hi');

      });

      $scope.change = function () {

        $scope.one.a.aa = 2; //不能监听到

        $scope.one.a = 3;  //可以监听

      }

    })

$apply,$digest

.controller('parent', function ($rootScope, $scope, $timeout) {

      $scope.a = 1;

      setTimeout(function () {

        $scope.$apply(function () {

          $scope.a++;

        })

      }, 3000)

     //或者直接使用digest

      setTimeout(function () {

        $scope.a++;

        $scope.$digest();

      }, 3000)

    })

$id :  $rootScope为1，然后scope按照在页面中出现的顺序以 2,3,4 依次排列

$root  指向$rootScope

$parent 指向父scope