「Client-Side Error Logging With Google Analytics」這篇提到可以用 Google Analytics 紀錄 JavaScript 錯誤...
不過這不是即時的紀錄,倒是作者有提到可以交叉比對,當發生 JavaScript 錯誤對於其他參數的影響:
Track the impact of client-side errors on other business metrics. With the reporting in Google Analytics you can see how these errors are affecting bounce rate, conversion and sales.