JS遍历Table的所有单元格内容

function GetInfoFromTable(tableid) {
var tableInfo = "";
var tableObj = document.getElementById(tableid);
for (var i = 0; i < tableObj.rows.length; i++) {    //遍历Table的所有Row
for (var j = 0; j < tableObj.rows[i].cells.length; j++) {   //遍历Row中的每一列
tableInfo += tableObj.rows[i].cells[j].innerText;   //获取Table中单元格的内容
tableInfo += "   ";
}
tableInfo += "\n";
}
return tableInfo;
}