<script>
    function allowDropi(ev)
    {
        ev.preventDefault();
    }

    function dragi(ev)
    {
        ev.dataTransfer.setData("Text",ev.target.id);
    }

    function dropi(ev)
    {
        ev.preventDefault();
        var data=ev.dataTransfer.getData("Text");
        ev.target.appendChild(document.getElementById(data));

        result1=0;

        if(ev.dataTransfer.getData("Text")==="drag2i")
        {
            result1++;

        }


        if(ev.dataTransfer.getData("Text")==="dra2i")
        {
            result1++;
        }


        if(ev.dataTransfer.getData("Text")==="dr2i")
        {
            result1++;
        }


        if(ev.dataTransfer.getData("Text")==="2i")
        {
            result1++;
        }


        if(ev.dataTransfer.getData("Text")==="d2i")
        {
            result1++;
        }

         document.getElementById('boldStuff6').innerHTML = result1;
    }

    alert(result1);

    </script>

this.result1 = ( this.result1  ) ? this.result1 : 0; // this will make sure it keeps old stored values from last time you call the function.

this.result1++; // or you can use ++this.result1; or even this.result1+=1;