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As shown in the picture, there are three buttons. Click any one of them and the button will turn into a blue background, and the other two buttons will return to the default white color

<button type="button" class="btn" ng-click='toggle()' ng-class='active'>按鈕1</button>
<button type="button" class="btn " ng-click='toggle()'>按鈕2</button>
<button type="button" class="btn " ng-click='toggle()'>按鈕3</button>

In controller:

$scope.toggle=function(){
  ··· 
}