struct in UnityEngine.Experimental.UIElements.StyleSheets
切换到手册这是一种通用结构，可以编码来自 USS 或以编程方式指定的值类型。
StyleValue<T> 结构包含各种值类型（比如整数或颜色）以及 USS 应用程序运行时的一些元数据。
| nil | 这表示相应泛型类型的 StyleValue<T> 的默认值。 |
| value | StyleValue<T> 的实际值。 |
| StyleValue_1 | 此构造函数可用于指定备用默认值，但建议使用 StyleValue<T>.nil。 |
| GetSpecifiedValueOrDefault | 读取自定义样式值时使用的 Utility 函数，并且一步就能提供默认值。 |
| Create | 直接从值创建相应泛型类型的 StyleValue。 |
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