angularjs - How to set value to $rootScope from text field on button click -

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following want do, in javascript style. @ loading html div (token) should show ever value in $rootscope.token.then when ever button pressed after typing text in input field (tokeninp), need update $rootscope.token , displayed value in html. 

document.getelementbyid("token").innerhtml = $rootscope.token;  function settoken(){     $rootscope.token = document.getelementbyid("tokeninp").value;     document.getelementbyid("token").innerhtml = $rootscope.token; }

how using angularjs (im new it)

in html 

    <span ng-bind="token"></span>    <input type='text' ng-model='tokenvalue'> </input> <input type="button" ng-click='modifiedtokenvalue ()'/>

in controller 

 $scope.token = $rootscope.token;   $scope.modifiedtokenvalue = function(){    $rootscope.token = $scope.tokenvalue;    $scope.token = $scope.tokenvalue;  };

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