Javascript: How to catch error on page navigated to using window.location.href = url
问题 I am using a REST service to generate a CSV file that I want to prompt the user to download. An example of the service is below: https://localhost:8444/websvc/exportCSV?viewId=93282392 To prompt the user to download the file, I use this code: window.location.href = exportUrl , where exportUrl would be a URL like the one above. This works great if there are no errors on the server when executing the service. The file download prompt appears, the page doesn't refresh, and all is well. However,