How to remove set of item values of array from another array in Javascript

var myFind_collections =[3,6,10,234,235,236,237,238,239,240,241,244,245,246,247,248,248,249,250];
var pgRangeCollection = [234,235,236,237,238,239,240,241,244,245,246,247,248,248,249,250];

for(v=0;v<=pgRangeCollection.length;v++){
    var pgMatch = pgRangeCollection[v];
    clear_pg_range(pgMatch);
    }

function clear_pg_range(pgMatch){
        //for(d=0;d<=myFind_collections.length-1;d++){
        for(d=0;d<=myFind_collections.length-1;d++){
            var docFound = parseInt(myFind_collections[d]);
            if(pgMatch===docFound){
                    myFind_collections.splice(myFind_collections[d],1);
                    alert(docFound + " was removed");
                }
            }
    }

alert(myFind_collections.length);

in above code i want to remove every item in myFind_collections which equals to pgRangeCollection

i want the output as (3,6,10) but i am getting the output as (248,249,250)

i dont know where i mistaking can anybody suggest solution for this,

Thanks in advance