Odata V4.0 URI

Hi all ,

We are using Odata v4.0 URI  in our js .

Tried  below different queries   got from  different blogs  . But nothing is working . can someone help us   ?

Please test and provide us the  solution .

Below queries are not working

a) var oDataURI = Xrm.Page.context.getClientUrl()+"/api/data/v8.0/"+"accounts?$select=name&$filter=accountid/Id eq (guid"'+accountGUID+'") ";
var req = new XMLHttpRequest();
req.open("GET", oDataURI, true);
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b)var oDataURI = Xrm.Page.context.getClientUrl()+"/api/data/v8.0/"+"accounts"+"(" + id + ")"+?$select=name";
var req = new XMLHttpRequest();
req.open("GET", oDataURI, true);
-
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c)var oDataURI = Xrm.Page.context.getClientUrl()+"/api/data/v8.0/"+"accounts?$select=name&$filter=accountid eq '"+accountguid+"'";
var req = new XMLHttpRequest();
req.open("GET", oDataURI, true);
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Thank you :)