javascript动态增删table行

/** ---------------------------------------------------------------------------
* 添加配件信息
* @author yeliangbiao
------------------------------------------------------------------------------*/
function addPrepare(){
var prepareTable = $("prepareTable");
var tr = prepareTable.insertRow(prepareTable.rows.length);
var td1 = tr.insertCell();
var td2 = tr.insertCell();
var td3 = tr.insertCell();
var td4 = tr.insertCell();
var td5 = tr.insertCell();
td1.innerHTML = "<input type='hidden' name='prepareId' value='0'>";//用0表示是新添加的
td1.innerHTML = td1.innerHTML + "<input type='text' name='prepareName' class='input70' maxlength='32' width='100%'/>";
td2.innerHTML = "<input type='text' name='prepareBrand' class='input70' maxlength='16' width='100%'/>";
td3.innerHTML = "<input type='text' name='prepareStandard' class='input70' maxlength='16' width='100%'/>";
td4.innerHTML = "<input type='text' name='prepareSum' class='input70' maxlength='10' width='100%' onkeyup='clearNoNum(this)'/>";
td5.innerHTML = "<div align='center'><a href='#' onclick='delPrepare()'>删除</a></div>";
}
//删除一条配件信息
function delPrepare(){
var index = event.srcElement.parentNode.parentNode.parentNode.rowIndex;
$("prepareTable").deleteRow(index);
}