我有ng单击相同回调的多个元素：
<button ng-click="doSomething()"></button> <button ng-click="doSomething()"></button> <button ng-click="doSomething()"></button> <button ng-click="doSomething()"></button>
// In controller:
$scope.doSomething = function() {
// How do I get a reference to the button that triggered the function?
};
角度方式显示在角度docs
