看一下这个例子：

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<link rel="stylesheet" type="text/css" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css">
<div ng-app>
    <div ng-init="showModal=false">
        <button class="btn btn-primary btn-lg" ng-click="showModal = !showModal">
            Launch demo modal
        </button>
        <div class="modal fade in" aria-hidden="false" style="display: block;" ng-show="showModal">  
            <div class="modal-dialog">    
                <div class="modal-content">   
                    MODAL   
                    <div class="modal-footer">        
                        <button type="button" class="btn btn-primary" ng-click="showModal=false">Ok</button>     
                    </div>    
                </div>  
            </div>
        </div>
    </div>
</div>