jQuery Mobile弹出窗口打开/关闭直到功能结束才开始

I have a jQuery Mobile (jQM) Single Page Application (SPA). I am trying to display a popup during what may be a long-running process. The popup open/close doesn't work until the cleanUp function terminates. As such, I get a brief flash of the popup at that time, so that at least is working. The larger application is also working but not this specific cleanUp function. I have a jQuery Mobile (jQM) Single Page Applic