Question

/**
 * @param { string } osVersion 
 */
export function OutOsName(osVersion) {
  if(!osVersion){
    return
  }
  let str = osVersion.substr(0, 3);
  if (str === "5.0") {
    return "Win 2000"
  } else if (str === "5.1") {
    return "Win XP"
  } else if (str === "5.2") {
    return "Win XP64"
  } else if (str === "6.0") {
    return "Win Vista"
  } else if (str === "6.1") {
    return "Win 7"
  } else if (str === "6.2") {
    return "Win 8"
  } else if (str === "6.3") {
    return "Win 8.1"
  } else if (str === "10.") {
    return "Win 10"
  } else {
    return "Win"
  }
}