具有的系统内存容量（只读）。
此为系统内存容量的近似值（以兆字节为单位）。
**WebGL**：此函数将返回 asm.js/WebAssembly 堆的当前大小。请注意，使用 WebAssembly 时，如果 Unity 内容内存使用量超过初始内存大小，则堆大小在运行时可能增加。
**Windows 应用商店应用程序**：Windows 应用商店应用程序不支持此功能，将始终返回 0。
另请参阅：SystemInfo.graphicsMemorySize。
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