How to make js convert key value string to json string

This time I will bring you how to use js to convert the key value string into a json string, and js to convert the key value string into a json string Notes Yes Which ones, the following are practical cases, let’s take a look.

Key-value pair characters to be converted

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

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