* @param arr 数组
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Full-sized keyboards, or 100 percent, include a function row at the top and a complete numpad with arrow keys on the right side, along with all of the rest of the alphanumeric keys you’d expect on a standard QWERTY layout. Tenkeyless, or 80 percent, removes the number pad but keeps the arrow keys and the function row, reducing the overall width measurement of the board by a decent amount. Compact keyboards keep things ultra simple by including only the alphanumeric keys and modifiers like Alt, Shift, Ctrl and others and they come in different sizes like 60 percent, 65 percent and more. These are the most popular sizes out there, but you can find plenty of other designs that include different mixes of keys along with the standard letters and numbers all should have.
Other keyboards have a mechanical-style feel but are built on different mechanisms entirely. The hot new trend in gaming-focused keyboards, for example, is Hall effect switches, which use tiny magnets to register keystrokes and let you customize the sensitivity of each press. Optical switches, meanwhile, offer similar functionality by replacing the physical contact point of a typical mechanical switch with a beam of infrared light. More recently, we’ve seen a couple keyboards launch with inductive switches, which can work like magnetic switches but use inductive coils in the keyboard’s printed circuit board (PCB) to cater to all switches collectively and don’t require a sensor for each individual switch. We touch on a couple of magnetic-switch keyboards in our picks below, but for a fuller breakdown of this sort of tech, we recommend you check out our dedicated buying guide to the best gaming keyboards.