angularjs - 扩展递归 [英] angularjs - extend recursive

问题描述

我想扩展一些递归属性(又名深度复制).很像jQuery.我不只包括 jquery 的 b/c 一件事.

I would like to extend some properties recursive (aka. deep copy). much like jQuery does. I'm not including jquery only b/c of one thing.

jQuery.extend( true, target, object1 )

你知道有什么优雅的方法可以用简单的 javascript 或 angularjs 来实现吗?

is there any elegant way you know of that does it with simple javascript or angularjs?

更新请看一看并尝试完成相同的结果http://plnkr.co/edit/GHabYbyhsqtfBPtplksO?p=preview

update please take a look and try to accomplish the same result http://plnkr.co/edit/GHabYbyhsqtfBPtplksO?p=preview

我确实研究了 .copy() 但属性(对象)被删除了"

i did look into .copy() but the "properties (for objects) are deleted"

推荐答案

这是一个基于 angular.extend 函数的 extendDeep 函数.如果你把它添加到你的 $scope 中，你就可以调用

Here is an extendDeep function based off of the angular.extend function. If you add this to your $scope, you would then be able to call

$scope.meta = $scope.extendDeep(ajaxResponse1.myMeta, ajaxResponse2.defaultMeta);

并获得您正在寻找的答案.

and get the answer you are looking for.

$scope.extendDeep = function extendDeep(dst) {
  angular.forEach(arguments, function(obj) {
    if (obj !== dst) {
      angular.forEach(obj, function(value, key) {
        if (dst[key] && dst[key].constructor && dst[key].constructor === Object) {
          extendDeep(dst[key], value);
        } else {
          dst[key] = value;
        }     
      });   
    }
  });
  return dst;
};

注意:此函数具有将值从后面的参数复制到前面的参数的副作用.要对此副作用进行简单的修复，您可以将 dst[key] = value 更改为 dst[key] = angular.copy(value).

Note: This function has the side-effect of copying values from later arguments into the earlier arguments. For a simple fix to this side effect, you can change dst[key] = value to dst[key] = angular.copy(value).

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