angularjs - Angular JS first tutorial -

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i have started learn angular js. have query regarding below code.

<html ng-app> <head> </head> </body> <h1>{{hello}} </h1> <input type="text" ng-model="hello"/> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.min.js"></script> </body> </html>

query: piece of code working fine when refresh page see {{hello}} fraction of second. why? 

<body ng-cloak> <h1>{{hello}}</h1>  -------- -------- -------- --------  </body>

to prevent angular html template being displayed browser use ngcloak.

note: use ngcloak in body tag hide these thing on complete page.

the best way avaid error is, use ng-bing directive see example below.

<h1 ng-bind="hello"></h1>

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