angular - 来自html的动态id访问元素

Question

http://plnkr.co/edit/BeBKU48YGSJaYPNoaBGF?p=preview

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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div data-ng-app="" ng-init="names=['1','2','3']">
    <div ng-repeat="x in names">
      <button ng-click="getElementById(x).innerHTML=Date()">The time is?</button>

      <p id="{{x}}"></p>
    </div>
</div>

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由于某种原因，我无法访问该ID。我做错了什么？