function addtd(tr, className, content) {
let td = document.createElement("td");
td.appendChild(document.createTextNode(content));
td.className = className;
tr.appendChild(td);
function addtd(tr, className, content) {
let td = document.createElement("td");
td.appendChild(document.createTextNode(content));
td.className = className;
tr.appendChild(td);