使用Javascript动态增加，删除表格（使用W3C对象模型）

< html >
< meta  http-equiv ="Content-Type"  content ="text/html; charset=utf-8"   />
< head >

< script  language ="javascript">
  function deleteRow(index){
    var tableObj=document.getElementById("mainBody");
    var rowObj=document.getElementById('row'+index);

    tableObj.removeChild(rowObj);

  }
  function addRow(){
     var tableObj=document.getElementById("mytable");
     var tableBodyObj=document.getElementById("mainBody");
     var newRowObj=document.createElement("tr");
     newRowObj.id="row"+(tableObj.rows.length-1);
     
     var newColName=document.createElement("td");
     var newColAge=document.createElement("td");
     var newColButton=document.createElement("td");
     
     newColName.innerHTML=document.getElementById("newName").value;
     newColAge.innerHTML=document.getElementById("newAge").value;
     newColButton.innerHTML='<input type="button" value="删除" onclick="deleteRow('+(tableObj.rows.length-1)+')">'; 
     
     newRowObj.appendChild(newColName);
     newRowObj.appendChild(newColAge);
     newRowObj.appendChild(newColButton);
     
     tableBodyObj.appendChild(newRowObj);
     
  }
</ script >
</ head >

< body >
< table  width ="100%"  id ="mytable"  border ="0"  cellspacing ="0"  cellpadding ="0" >
  < tbody  id ="mainBody" >
   < tr >
     < td > 姓名 </ td >
     < td > 年龄 </ td >
     < td > 操作 </ td >
   </ tr >
   < tr  id ="row0" >
     < td > gaoxiang </ td >
     < td > 28 </ td >
     < td >< input  type ="button"  onclick ="deleteRow(0)"  value ="删除" /></ td >
   </ tr >
    < tr  id ="row1" >
     < td > gaoxiang </ td >
     < td > 28 </ td >
     < td >< input  type ="button"  onclick ="deleteRow(1)"  value ="删除" /></ td >
   </ tr >
   </ tbody >
</ table >

< input  type ="text"  name ="name"  id ="newName"   />
< input  type ="text"  name ="age"  id ="newAge" />
< input  type ="button"  onclick ="addRow();"   value ="新增" />
</ body >
</ html >