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html+js
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<table>
<tr>
<td><input
type="button"
value="add"
onclick="setOp('+',
'add');"/></td>
<td><input
type="button"
value="miner"
onclick="setOp('-',
'miner');"/></td>
<td><input
type="button"
value="times"
onclick="setOp('*',
'times');"/></td>
<td><input
type="button"
value="divide"
onclick="setOp('/',
'divide');"/></td>
</tr>
</table>
<table id="tb_calc" style="display:none;">
<tr>
<td>
<input
id="x"
type="text"
style="width:100px"
value=""
name="x" /></td>
<td> <lable id="op" name="op"></lable> </td>
<td>
<input
id="y"
type="text"
style="width:100px"
value=""
name="y" /> </td>
<td>
<input
id="opTips"
type="button"
value=""
onclick="calc();"/> </td>
<td> <lable id="z" name="z"></lable> </td>
</tr>
</table>
<script type="application/javascript">
function setOp(op, opTips)
{
var tb=document.getElementById("tb_calc");
tb.style.display = "none";
document.getElementById("x").value = "";
document.getElementById("y").value = "";
document.getElementById("z").innerText = "";