Applet Wx Previewmedia related problem solving - Daily stepping on the pit

wx.previewMedia: Preview pictures and videos .

problem 1：

Project under development , Update photos of cloud storage , After regaining the temporary link , Take it to wx.previewImage When previewing ,( or wx.previewMedia ), Finally, there are old pictures .

reason ： Server image cache reason , The applet cannot be updated in time .

Solution ： In the picture URL Add parameters after , Let the picture URL Greater discrimination , such as https://xxxxxxxxx.tcb.qcloud.la Add parameters ：https://xxxxxxxxx.tcb.qcloud.la?time=12345667

problem 2:

When the type is video when , Multiple videos at the same time . Added a video cover in , But when you click preview , Only the first time is normal , When you click the second video playblast , The cover image displayed is the last cover image , And the video cannot be played .

reason ： To find out why , It is initially suspected that the cover image is too large

Solution ： By compressing the cover image , Compress the picture to dozens k Size , The exact size is unknown , Problem solving