请教在angular里从多维对象数组里删除某个对象数组的问题

评论展示是ng-repeat，comment in comments。
有删除评论功能，ng-click之后，把comment传到删除函数里，然后从comments里把这个comment删掉，这个删除的语句应该怎么写呢？
谢谢！

---

<div ng-repeat='comment in comments' ng-click='del($index,comments)'>{{comment}}</div>

$scope.delete=function(key,arr){
   arr.splice(key,1);
}

---

html

<div ng-repeat='comment in comments' ng-click='delete($index)'>{{comment}}</div>

js

app.controller('myCtrl', function($scope) {
    $scope.comments=[1,2,3,4]
    $scope.delete=function(i){
        $scope.comments.splice(i,1)
    }
})