如何从对象返回设置 [英] How to return settings from an object

问题描述

我做了这样的事：

myProject =

  settings:
    duration: 500
    value: 'aValue'

  aFunction: ->
    myElement.fadeOut myProject.settings.duration

这只是一个示例，像那样。很多时候，我必须参考设置获得一定的值，我总是写 myProject.settings.value ，它不看起来不错。

This is just a sample but my project is like that. A lot of times i have to reference to the settings to get a certain value, and i always have to write myProject.settings.value, and it doesn´t look good.

我的问题是，我可以调用一个函数来返回想要的值吗？这样的东西：

My question is, can I call a function that returns the wanted value? Something like this:

aFunction: ->
  myElement.fadeOut getSetting(duration)

我尝试使用

getSetting: (param) ->
  myProject.settings.param

但失败？这是为什么？
谢谢！

but failed? Why is that? Thank you!

推荐答案

要通过变量访问对象属性，您可以：

To access an object property by a variable, you can do:

object[key]

在coffeescript中，最后一行应该是返回值，在您的示例中：
请注意@（= this）。

In coffeescript, the last line should be the return value, in your example: Please note the @ (= this).

myProject =

  settings:
    duration: 500
    value: 'aValue'

  fadeOut: ($element) ->
    $element.fadeOut @getSetting('duration')

  getSetting: (key) ->
    @settings[key]

myProject.fadeOut($myElement)

javascript：

The javascript :

var myProject;

myProject = {
  settings: {
    duration: 500,
    value: 'aValue'
  },
  fadeOut: function($element) {
    return $element.fadeOut(this.getSetting('duration'));
  },
  getSetting: function(key) {
    return this.settings[key];
  }
};

myProject.fadeOut($myElement);

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