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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="testApp" ng-controller="testCtrl">
  <div ng-mouseover="open = true" ng-mouseleave="open = false">
    To display button mouseover here!!!
 <button class="btn btn-primary" type="button" ng-show="open"   >
        <i class="fa fa-plus">Button</i>
 </button>
    </div>
   
</div>