显示/隐式 any 坑 视频位置 TypeScript快速梳理_上篇 33:38 一旦把数据类型设置为any,那么就表示你放弃了类型检查。 显示/隐式 any any 的含义是:任意类型,⼀旦将变量类型限制为 any ,那就意味着放弃了对该变量的类型检查。 // 明确的表示a的类型是 any —— 【显式的any】 //一旦此处把 a...
笔记 An item is piece of information about the device. All items have a one-byte prefix that contains the item tag , item type , and item size . 一个“项”是描述设备的一段信息。所有项都有一个字节的前缀,其中包...
描述 格式 注释 笔记 描述 Main items are used to either define or group certain types of data fields within a Report descriptor. There are two types of Main items: data and non-data. D...
The Report descriptor is unlike other descriptors in that it is not simply a table of values. The length and content of a Report descriptor vary depending on the number of data ...
描述 格式 笔记 描述 Like the short item format, the long item format packs the item size, type, and tag into the first byte. The long item format uses a special item tag value to ind...
描述 格式 注释 描述 The short item format packs the item size, type, and tag into the first byte. The first byte may be followed by 0, 1, 2, or 4 optional data bytes depending on the...
Figure 3-1 shows four main focus areas of a Universal Serial Bus (USB) system. These areas are the Client Software/USB Driver, Host Controller Driver (HCD), Host Controller (HC), ...