<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>添加</title>
</head>
<body>
<form>
姓名:<input type="name" name="姓名" id="name" /><br />
成绩:<input type="number" name="成绩" id="score" /><br />
<input type="button" id="saveBtn" value="添加" onclick="Add()" />
</form>
<br />
<table id="SmithTb" border="2px" width="300px" style="text-align: center;">
<tr>
<th width="50%">姓名</th>
<th width="50%">成绩</th>
</tr>
<tr>
<td width="50%">张三</td>
<td width="50%">100</td>
</tr>
<tr>
<td width="50%">李四</td>
<td width="50%">100</td>
</tr>
</table>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script>
function Add() {
var name = $("#name").val();
var score = $("#score").val();
var isAdd = true;
if (isAdd)
$("#SmithTb").append('<tr><td>' + name +'</td><td>' + score + '</td></tr>');
}
</script>
</body>
</html>
效果如图: