js获取系统版本信息，支持获取win10系统

/*
 * 获取系统版本信息
 */ 
function getOsInfo() {
    let userAgent = window.navigator.userAgent.toLowerCase()
    let version = ''
    if(userAgent.indexOf("win") > -1) {
      if(userAgent.indexOf("windows nt 5.0") > -1 || userAgent.indexOf("Windows 2000") > -1) {
        version = "Windows 2000";
      } else if(userAgent.indexOf("windows nt 5.1") > -1 || userAgent.indexOf("Windows XP") > -1) {
        version = "Windows XP";
      } else if(userAgent.indexOf("windows nt 5.2") > -1 || userAgent.indexOf("Windows 2003") > -1) {
        version = "Windows 2003";
      } else if(userAgent.indexOf("windows nt 6.0") > -1 || userAgent.indexOf("Windows Vista") > -1) {
        version = "Windows Vista";
      } else if(userAgent.indexOf("windows nt 6.1") > -1 || userAgent.indexOf("windows 7") > -1) {
        version = "Windows 7";
      } else if(userAgent.indexOf("windows nt 6.2") > -1 || userAgent.indexOf("windows 8") > -1) {
        version = "Windows 8";
      } else if(userAgent.indexOf("windows nt 6.3") > -1) {
        version = "Windows 8.1";
      } else if(userAgent.indexOf("windows nt 6.4") > -1 || userAgent.indexOf("windows nt 10") > -1) {
        version = "Windows 10";
      } else {
        version = "Unknown";
      }
    } else if(userAgent.indexOf("iphone") > -1) {
      version = "Iphone";
    } else if(userAgent.indexOf("mac") > -1) {
      version = "Mac";
    } else if(userAgent.indexOf("x11") > -1 || userAgent.indexOf("unix") > -1 || userAgent.indexOf("sunname") > -1 || userAgent.indexOf("bsd") > -1) {
      version = "Unix";
    } else if(userAgent.indexOf("linux") > -1) {
      if(userAgent.indexOf("android") > -1) {
        version = "Android"
      } else {
        version = "Linux";
      }
    } else {
      version = "Unknown";
    }
	return version;
}