功能實現：點擊添加按鈕，表格增加一行并給其name屬性賦予的值，方便獲取
點擊刪除，自動刪除這一行
JQuery中定義一個count變量
var count = 1;function add() {var tbl = document.all.ci;var rows = tbl.rows.length;var tr = tbl.insertRow(rows);var e_id = tr.insertCell(0);e_id.innerHTML = '<input type="text" name="e_id' + count + '" size="7" />';var class_id = tr.insertCell(1);class_id.innerHTML = '';var memo = tr.insertCell(2);memo.innerHTML = '<input type="text" name="memo' + count + '" size="14" />';var del = tr.insertCell(3);del.innerHTML = '<input type="button" onclick="del(this)" value="刪除" />';count++;}function del(btn) {var tr = btn.parentElement.parentElement;var tbl = tr.parentElement;if (tr.rowIndex >= 1) {tbl.deleteRow(tr.rowIndex);} else {}}; 
