AngularJS Example:

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<br />
<div ng-app='home'>

<div ng-controller='one'>
  Type in text: 
  <input type='text' ng-model="inputText.o"/>
</div>
<br />

<div ng-controller='two'>
  Type in text:
  <input type='text' ng-model="inputTextTwo.o"/>
</div>

</div>

JavaScript

var app = angular.module("home", []);

app.controller('one', function($scope, ser1){
$scope.inputText = ser1;
});


app.controller('two',function($scope, ser1){
$scope.inputTextTwo = ser1;
});

app.factory('ser1', function(){
return {o: ''};
});