get list item id in javascript?

You can use something like this

       function getQuerystring(key, default_)
        {
          if (default_==null) default_="";
          key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
          var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
          var qs = regex.exec(window.location.href);
          if(qs == null)
                return default_;
          else
                return qs[1];
        }
        
        var ccpid = getQuerystring('ID');

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Artificial intelligence can never beat natural stupidity.