Stackoverflow 现在支持在线运行 JS 代码，用户可以直接在答案页面点击 Run code snippet 按钮执行代码块中的 JS 代码，无需拷贝到本地环境，方便验证代码的正确性。
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在下面这个截图中可以看到，点击答案下面的 Run code snippet 按钮之后，页面会执行代码块中的 JS 代码，并且调用 alert 函数显示在页面上，这省去了拷贝代码，粘贴到本地开发环境中，运行本地代码的步骤，非常方便就可以验证别人给的答案中的代码是否能够正常工作。
---stackoverflow 链接：https://stackoverflow.com/questions/38241480/detect-macos-ios-windows-android-and-linux-os-with-js
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