聚合物中的私有非静态变量？ [英] Private non-static variables in polymer?

问题描述

如何在聚合物中使用私有非静态变量？

How is it possible to have private non-static variables in polymer?

在：

<polymer-element name="component-one">
   <script>

       Polymer('component-one', {
       internalState = 1,    
       ready() {
               this.anotherInternalState = 1;
           }
           /* more variables and functions */
      });

   </script>

</polymer-element>

internalState和anotherInernalState都暴露在外面（例如可通过以下方式访问：

both internalState and anotherInernalState are exposed to outside (e.g. accessible through something like:

document.querySelector('component-one').internalState

（从外部更改internalState时可能不合需要使组件不稳定。）

(Which might be undesirable when changing internalState from outside makes the component unstable.)

其中：

<polymer-element name="component-two">
   <script>

    (function() { 

       var internalState = 1;


       Polymer('component-two', {
          /* some variables and functions */
      });
    })();

   </script>

</polymer-element>

internalState从外部隐藏，但它是静态的，并在组件的所有实例中共享。

internalState is hidden from outside but it is static and shared across all the instances of the component.

有没有办法在聚合物对象中有一个私有的非静态变量？

Is there a way to have a private non-static variable inside polymer object?

推荐答案

这是一个纯粹的JavaScript问题，而不是Polymer问题。从ES5开始，JavaScript中没有私有实例成员，尽管ES6带来了一些新工具。

This is more of a pure JavaScript question than a Polymer question. As of ES5 there are no 'private instance members' in JavaScript, although ES6 brings some new tools.

我的建议是使用旧的预设私有实例变量的约定下划线（ _internalState ）。

My suggestion is to use the old convention of prepending private instance variables with underscore (_internalState).

否则，你必须对地图和闭包感到棘手。

Otherwise, you have to get tricky with maps and closures.

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