js动态增加行 删除行

//动态增加行
function addRow(tab){
	var title = "";
	var table = document.getElementById(tab);
	var newRow = table.insertRow();//
	var newCell = newRow.insertCell();
	if(tab=="projectTab"){
		title = $("#proTitle").val();
		newCell.innerHTML="<input type='text' value="+title+" style='border-top:0px;border-left:0px;border-bottom:0px;border-right:0px;width:70px;' /><textarea style='width:600px;height:120px;vertical-align:top;'></textarea>  <a href='javascript:void(0);' onclick=\"deleteRow(this,'projectTab')\">删除</a>";
	}else if(tab=="companyTab"){
		title = $("#comTitle").val();
		newCell.innerHTML="<input type='text' value="+title+" style='border-top:0px;border-left:0px;border-bottom:0px;border-right:0px;width:70px;' /><textarea style='width:600px;height:120px;vertical-align:top;'></textarea>  <a href='javascript:void(0);' onclick=\"deleteRow(this,'companyTab')\">删除</a>";
	}else{
		title = $("#riskTitle").val();
		newCell.innerHTML="<input type='text' value="+title+" style='border-top:0px;border-left:0px;border-bottom:0px;border-right:0px;width:70px;' /><textarea style='width:600px;height:120px;vertical-align:top;'></textarea>  <a href='javascript:void(0);' onclick=\"deleteRow(this,'riskTab')\">删除</a>";
	}
}
//动态删除行
function deleteRow(obj,tab){
	var tr = obj.parentNode.parentNode;
	var tbody = tr.parentNode;
	tbody.removeChild(tr);
}