jquery实现增加删除行的方法

<div class="oz-form-fields"  style="width:450px;padding-: 5px"> 
    <table cellpadding="0" cellspacing="0" style="width:450px;" id="optionContainer"> 
        <tr id="option0">  
            <td class="oz-form-Label">所属问题 
                <c:if test="${questionType=='radio'}">(单选)</c:if> 
                <c:if test="${questionType=='checkbox'}">(复选)</c:if> 
            </td> 
            <td class="oz-property" > 
                ${question} 
            </td> 
            <td></td> 
        </tr> 
        <tr id="option1">  
            <td class="oz-form-Label">选项1</td> 
            <td class="oz-property" > 
                <input type="text"  style="width:300px"> 
            </td> 
            <td></td> 
        </tr> 
        <tr id="option2">  
            <td class="oz-form-Label">选项2</td> 
            <td class="oz-property" > 
                <input type="text"  style="width:300px" > 
            </td> 
            <td></td> 
        </tr> 
        <tr id="option3">  
            <td class="oz-form-Label">选项3</td> 
            <td class="oz-property" > 
                <input type="text"  style="width:300px"> 
            </td> 
            <td></td> 
        </tr> 
        <tr id="option4">  
            <td class="oz-form-Label">选项4</td> 
            <td class="oz-property" > 
                <input type="text"  style="width:300px"> 
            </td> 
            <td></td> 
        </tr> 
    </table> 
    <div style="text-align: center;"> 
        <a href="#" onclick="addRow()">添加一行</a> 
    </div> 
</div>

var rowCount=4;  //行数默认4行 
  
//添加行 
function addRow(){ 
    rowCount++; 
    var newRow='<tr id="option'+rowCount+'"><td class="oz-form-Label">选项'+rowCount+'</td><td class="oz-property" ><input type="text"  style="width:300px"></td><td><a href="#" onclick=delRow('+rowCount+')>删除</a></td></tr>'; 
    $('#optionContainer').append(newRow); 
} 
 
//删除行 
function delRow(rowIndex){ 
    $("#option"+rowIndex).remove(); 
    rowCount--; 
}

$("#tab tr").eq(-2).after("<tr style='border:none;'><td style='width: 120px;border:none;' align='right'><strong>关键词名称</strong></td><td style='width: 225px;border:none;'><input type='text' name='name' id='smsName' style='width: 135px;'/> <span class='red'> </span></td></tr>");