angularjs - ng-repeat one-time binding inheritance?

Question

If I have an ng-repeat directive iterating through a list of lists via a one-time binding, does a nested ng-repeat through each of the inner lists also need a one-time binding, or is that redundant?

<div ng-repeat="list in ::$ctrl.lists">
  <span ng-repeat="item in list">{{item}}</span>
</div>

Do I need to change the inner ng-repeat to item in ::list? $ctrl.lists will never change in any manner.

Answer 1

没有指定继承的地方，如果绑定了数组，则事件，数组内的对象仍然可以更改，因此最好也将'::'用于span循环。

http://jsfiddle.net/vw2fjxys/64/

var a = [1,2,3]
    setTimeout(function(){
    console.log(2)
        a.length = 2
      $scope.$apply();
    },3000)
$scope.lists = [a];

您可以在 2 秒后在示例中看到，使用 :: 它不会为内部循环重新计算，但没有它。