javascript - angular controller variable changes when set afterwards? -

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var jem = 55;    var app = angular.module("store",[]);  app.controller("storecontroller",function(){    this.product = jem;  });      jem = 0;
<!doctype html>  <html ng-app="store">  <head>  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0/angular.min.js"></script>    <meta charset="utf-8">    <title>js bin</title>  </head>  <body ng-controller="storecontroller store">    <p>{{"hi"}}</p>    <p>{{store.product}} </p>    </body>  </html>

why output "0" instead of "55"? since jem basic javascript variable when product assigned jem gets value copied , should not change when jem changed?

notice controller definition inside callback function (as should be...)

app.controller("storecontroller", function(){   this.product = jem; });

a side effect of this, relevant question, assignment statement within callback, this.product = jem, executed after assignment statement, jem = 0, outside of callback.

the takeaway callbacks not take place sequentially rest of code.


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