AngularJS 文本字段禁用5秒

<div ng-app="myApp">
    <textarea ng-disabled="isDisabled">
        禁止5秒
    </textarea>
</div>

<script>
angular.module("myApp",[])

.run(function($rootScope,$timeout){
        $rootScope.isDisabled = true;
        $timeout(function(){
            $rootScope.isDisabled = false;
        },5000)
    })
</script>

字段会被禁用5秒,知道$timeout将isDisabled属性设置为false