是否与下面的代码片段的任何表面上的问题：

Is there any ostensible issue with the following snippet:

  <ul id="entry-name" class="breadcrumb">
      <li ng-repeat="dir in pathElements()" class="active">
          <span ng-show="!$last">
              &nbsp;<a href="#!?path={{dir.url}}">{{ dir.name }}</a>&nbsp;<span ng-show="!$first" class="dividier">/</span> 
          </span>
      </li>
      <li class="active">{{ pathElements()[pathElements().length - 1].name }}</li>
  </ul>

这个JS：

  $scope.pathElements = function() {
      var retval = [];
      var arr = $scope.currentPath().split('/');
      if (arr[0] == '') {
          arr[0] = '/';
      }

      var url = "/";
      retval.push({name: arr[0], url: url});
      for (var i = 1; i < arr.length; ++i) {
          if (arr[i] != '') {
              url += arr[i] + '/';
              retval.push({name: arr[i], url: url});
          }
      }
      return retval;
  };

这似乎是导致错误：！10 $摘要（）迭代达到中止错误，但我不知道为什么。是不是因为pathElements（）将返回每次一个新的数组？有没有办法来解决这个问题？

This seems to be causing a "Error: 10 $digest() iterations reached. Aborting!" error, but I'm not sure why. Is it because pathElements() is returning a new array each time? Is there a way to get around this?

推荐答案

是的，这是因为你每次都返回一个新的数组，$消化周期无限循环（但角停止它）。你应该声明它的函数之外。

Yes, this happens because you're returning a new array every time, and the $digest cycle loops infinitely (but Angular ceases it). You should declare it outside the function.

$scope.pathArray = [];
$scope.pathElements = function() {
  // retval becomes $scope.pathArray
  if (weNeedToRecalcAllPathVariables) {
    $scope.pathArray.length = 0;
    // ...
  }

  // ...
}

我们使用 $ scope.pathArray.length = 0 ，而不是创建一个新的，以避免它不断地射击。

We use $scope.pathArray.length = 0 instead of creating a new one, to avoid it firing continuously.

您还应该考虑什么@Flek建议。调用该函数只有一次，在你需要它重新计算的时间。和所有你绑定应该是直接在 $ scope.pathArray 。

You should also consider what @Flek suggests. Call this function only once, in the time you need it to recalculate. And all you binds should be directly over $scope.pathArray.

如果你需要一个函数使用它之前测试其clenaning状态，那至少我建议你创建两个单独的功能，只是为了让每个功能与它自己的属性。

If you do need a function to test its clenaning state before using it, then at least I suggest you to create two separate functions, just to keep each function with it own attribution.