其中的每一个属性都可帮助确定向哪个用户提供哪些内容。
Each of these attributes helps to determine which content is provided for which user.
每一个属性都有一个ID，它是一个字符串，而某个值可以是任意的对象。
Each property has an id, which is a string, and a value that can be any object.
例如，它让您可以检查所有的属性，然后得到每一个属性的名称和值。
For example, it allows you to check out all attributes, and then to get the name and value for each.
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