$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 watch = $scope.$watch('someModel.someProperty', callback);
//...
watch();
$watchGroup(watchExpressions, listener); $watchCollection(obj, listener);
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