JavaScript增减表格行

function   addRow()   {   
		var myTable = document.getElementById("t2");   
		var i = myTable.rows.length;   
		var row = myTable.insertRow();
		
		row.align = "center";
				
		row.insertCell(0).innerText = i;
		row.insertCell(1).innerHTML = "<input name=\"textfield\" type=\"text\" size=\"3\" />";
		row.insertCell(2).innerHTML = "<input name=\"textfield2\" type=\"text\" size=\"3\" />";
		row.insertCell(3).innerHTML = "<a href=\"#\" onclick=\"if(!confirm('确定删除该信息吗？')){return;}deleteRow("+i+");\">删除</a>";
		
  }

 

function deleteRow(i){
  	var myTable = document.getElementById("t2");   
  	var l = myTable.rows.length;
	
	for(var s = i + 1; s < l;s++ ){
		myTable.rows[s].cells[0].innerText = s - 1;
		myTable.rows[s].cells[3].innerHTML = "<a href=\"#\" onclick=\"if(!confirm('确定删除该信息吗？')){return;}deleteRow("+(s - 1)+");\">删除</a>";
	}
	myTable.deleteRow(i);
  
  }

 表格id=t2，四列，每次删除行都会有确认信息。