javascript - Uncaught ReferenceError : platform is not defined

Question

是的，所以我最近选择了 javascript 作为另一种要学习的语言。我正在一个 friend 的网站上工作，我们需要保留平台操作系统的日志，以便我们可以对统计数据进行评级。

我收到错误 Uncaught ReferenceError: platform is not Define at get_platform (eval at (file:///C:/Users/*****/Desktop/Project/index.html:2:9), : 1:191)

有人知道我该如何解决这个问题吗？任何帮助是极大的赞赏!

这是我的代码。

function get_platform(os_name) {
var os_str = os_name;
var chk_win = os_str.substr(0, 3);
if (chk_win == "Win")
    platform = "win";
if (chk_win == "Lin")
    platform = "linux";
if (chk_win == "X11")
    platform = "unix";
return platform};
function get_os() {
var OSName = "Unknown";
if (window.navigator.userAgent.indexOf("Windows NT 6.3") != -1)
    OSName = "Windows 8.1";
if (window.navigator.userAgent.indexOf("Windows NT 6.2") != -1)
    OSName = "Windows 8";
if (window.navigator.userAgent.indexOf("Windows NT 6.1") != -1)
    OSName = "Windows 7";
if (window.navigator.userAgent.indexOf("Windows NT 6.0") != -1)
    OSName = "Windows Vista";
if (window.navigator.userAgent.indexOf("Windows NT 5.1") != -1)
    OSName = "Windows XP";
if (window.navigator.userAgent.indexOf("Windows NT 5.0") != -1)
    OSName = "Windows 2000";
if (window.navigator.userAgent.indexOf("Mac") != -1)
    OSName = "Mac/iOS";
if (window.navigator.userAgent.indexOf("X11") != -1)
    OSName = "UNIX";
if (window.navigator.userAgent.indexOf("Linux") != -1)
    OSName = "Linux";
return OSName};

Answer 1

试试这个...看起来变量平台尚未正确定义。

function get_platform(os_name) {
  var os_str = os_name;
  var chk_win = os_str.substr(0, 3);
  var platform = "";
  if (chk_win == "Win")
    platform = "win";
  if (chk_win == "Lin")
    platform = "linux";
  if (chk_win == "X11")
    platform = "unix";
  return platform
};

注意上面添加的这一行；您可以这样定义它或添加“默认”选项:

var platform = "";