js method to convert key-value pair strings into json strings

Key-value pair characters to be converted

 var respDesc=“cardid=64157001&cardnum=1&sporder_id=PD12160428120635001&sporder_time=20160526101552”；
 var newstr = ("=",":\""); 
 var stringObj= "{" +("&","\",") + "\"}";

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