Create GUID for each item created or added to a list.Using JSOM

Trying to create a unique ID(not sequential which is preferably an alpha numeric unique ID) for each row item added. The same I have tried using an EXCEL formula, but how to integrate it with SharePoint list using JSOM and script editor web part. Also need to know how to bind the code to sharepoint list.

formula used in EXCEL sheet =CONCATENATE(DEC2HEX(RANDBETWEEN(0,4294967295),8),”-“,DEC2HEX(RANDBETWEEN(0,42949),4),”-“,

thanks in advance…