急求：javascript如何在表格的下一行添加一行

function add(){
    var tbl = document.getElementById("myTable");
    var obj = tbl.insertRow(tbl.rows.length);
    obj.insertCell().innerHTML = "1";
    obj.insertCell().innerHTML = "2";
    obj.insertCell().innerHTML = "3";
    obj.onmouseover=function(){markThisTr(obj)};
    obj.onmouseout=function(){mouseOut(obj)};
    obj.style.textAlign='center';
    obj.style.cursor='pointer';
}

var obj = document.getElementById("myTable").insertRow(-1);
obj.insertCell(0).innerHTML = "1";
obj.insertCell(1).innerHTML = "2";
obj.insertCell(2).innerHTML = "3";

用jquery吧

给你个例子做参考