$watch(watchExpression, listener, objectEquality);
$scope.name = 'hello';
var watch = $scope.$watch('name',function(newValue,oldValue, scope){
console.log(newValue);
console.log(oldValue);
});
$timeout(function(){
$scope.name = "world";
},1000);
var app=angular.module("watchApp",[])
.controller("watchController",["$scope",function($scope){
$scope.object={};
$scope.object.one=$scope.one;
$scope.object.one=$scope.one;
$scope.$watch("object",function(){
.....
},true);
}])
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