Several web problems needing attention in Android programming

First: WebView above Android 4.4, that is, the built-in browser of the app does not support input [type = file], so you should pay special attention to this when uploading pictures and make it clear to customers. (depressed...)

Second: it seems that new customevent() is not supported on Android under 4.4, because this also makes me very depressed

Third: it's still the problem of uploading. Don't write simplified code directly. It is recognized above 4.4, but there will be problems below 4.4. Error:

Right:

I've hit several pits. I hope you can avoid them. Please inform me and let me hide a few

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