Highlight number of cells in HTML table by Javascript

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I want to highlight from index 0 to input number of cell on my html table, but my code is currently just highlight the last cell of the list. is there anyway I can do something like table.rows[0:i].cells[0:j] in Javascript

$('#dOcButton').click(function() {
    $('#displayOptionalCases input').click()
    highLight()
});
function highLight(){
    numCases = parseInt(document.getElementById('input1').value)
    TableX = document.getElementById('generatedResultsTable')
        //Reset table highlight
    var rows = document.getElementsByTagName("TD");
    for(i = 0; i < rows.length; i++){
        rows[i].className= "resetCell" ;
    }
    var cell;
    var u = 1
    for(i=0; i<TableX.rows.length; i++)
    {   for(j=0; j<10; j++)     
        {
            u = u + 1
            cell=TableX.rows[i].cells[j]
            cell.className = "cellSelected"
            if (u==numCases+1){break;}
        }
        if (u==numCases+1){break;}
    }
}

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