function test(){
        var array=["3","3","6","6","9","11"]; 
        var arr = [];
        var index = 1;
        for(var i=0; i<array.length;i++){
            if(i==0){
                arr[i] = index;
            }
            else{
                if(array[i]==array[i-1]){
                    arr[i] = index;
                }
                else{
                    index = index +1;
                    arr[i] = index;
                }
            }
        }
        alert(arr);
    }