how to check file param exists ?
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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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