I have done the upload / download function, and now I want to achieve: when the upload / download is not completed, click to close the browser, the pop-up file is downloading / uploading, are you sure to close?
I have done the upload / download function, and now I want to achieve: when the upload / download is not completed, click to close the browser, the pop-up file is downloading / uploading, are you sure to close?
refer to the API documentation.
window.onbeforeunload-Web API API | MDN- https://developer.mozilla.org.
the general idea is:
how to solve the problem
window.onunload = function(){
alert('?')
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