const path = require('path');

if (path.sep === "\\") {
console.log("Windows");
} else {
console.log("Not Windows");
}

要使用的变量是process.platform

在Mac上，该变量被设置为darwin。在Windows上，它被设置为win32(甚至在64位上)。

当前可能的值为:

aix 达尔文 freebsd linux openbsd sunos win32 android(根据链接，是实验性的)

我刚刚在我的jakeFile顶部设置了这个:

var isWin = process.platform === "win32";

var isWin64 = process.env.hasOwnProperty('ProgramFiles(x86)');

过程

var opsys = process.platform;
if (opsys == "darwin") {
    opsys = "MacOS";
} else if (opsys == "win32" || opsys == "win64") {
    opsys = "Windows";
} else if (opsys == "linux") {
    opsys = "Linux";
}
console.log(opsys) // I don't know what linux is.

OS

const os = require("os"); // Comes with node.js
console.log(os.type());

这对我来说很好

var osvar = process.platform;

if (osvar == 'darwin') {
    console.log("you are on a mac os");
}else if(osvar == 'win32'){
    console.log("you are on a windows os")
}else{
    console.log("unknown os")
}

对我来说没问题

if (/^win/i.test(process.platform)) {
    // TODO: Windows
} else {
    // TODO: Linux, Mac or something else
}

修饰符i用于进行不区分大小写的匹配。