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how to check file param exists ? #410

@wzhsh90

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@wzhsh90

var formData = new FormData();
formData.append("picFile1", narrowFiles[0]);
formData.append("picFile2", narrowFiles[1]);

formData.append("pub_time", "xxxx");

the picFile1 and picFile2 is Multipart file type.
the pub_time is text

how can i check picFile1 org picFile2 is exists and how can i get pub_time filed value ?

the multipart example does not show how to get it .

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