Accessing SharePoint List via external html page using .ajax function but getting CORS error

[Tarundeep Singh]

I need to query SharePoint List from simple javascript, using .ajax call. I need to use a AD user credentials who will have read permissions to the SharePoint Site. I am doing something like this but getting a lots of errors. Any suggestions.

var user = "****@AD2012.***";
var passwordtemp = "**********";
$.ajax({    
url: siteURL + "/_api/web/lists/GetByTitle('"+ listName +"')/items" + filterQuery,    
method: "GET",    
headers: { "Accept": "application/json; odata=verbose" },    
crossDomain: true,    
beforeSend: function (xhr) {        
xhr.setRequestHeader('Authorization', make_base_auth(user, passwordtemp));
    },    
success: function (data) {
         // Doing something with data ..            
        }},    error: function (data) {        failure(data);
    }
});
} // function ends ..