الطاولة deleteTHead() Method

document.getElementById("myTable").deleteTHead();

function myCreateFunction() {
    var table = document.getElementById("myTable");
    var header = table.createTHead();
    var row = header.insertRow(0);
    var cell = row.insertCell(0);
    cell.innerHTML = "<b>This is a table header</b>";
}

function myDeleteFunction() {
    document.getElementById("myTable").deleteTHead();
}