JS printAllCells

var table = document.querySelector("tbody")
var str = ""
for (var i = 0, row; row = table.rows[i]; i++) {
    for (var j = 0, cell; cell = row.cells[j]; j++) {
        str = str + cell.innerText + ', '
    }
    str = str + '\n'
}
console.log(str)