make flash does not upload modified javascript file about sming HOT 2 CLOSED

Your issue is somewhat lacking in detail, but I'll make a few observations. Note that the build system isn't smart enough to detect changes in the target filesystem layout so you must do this manually.

In general when you need to rebuild a filing system partition image use make buildpart. If the partition in question is called, say, spiffs0, then you can be more specific and use make buildpart PART=spiffs0. That will rebuild the image from the source files.

Regarding make flash, if you run make help you'll see it described as Write the boot loader and all defined partition images. By contrast, make flashpart PART=spiffs0 will flash only the spiffs0 partition.

If you're doing a lot of this sort of iterative development on high-level stuff like web interfaces, you might consider getting your project building for Host and use that for development (if you're not already!). It's much faster than repeatedly re-flashing devices!

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Thanks for the hint. I tried the make buildpart, it is still not clever enough to detect the change and build the newly modified file, I still need to change the file name so that it can detect the change.
I do need to try the host build.

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