一个简单的jQuery计算器，只是实现了一个连续计算的功能
<!DOCTYPE html>
<html>
<head>
<meta charset="utf8"/>
<title>Javascript计算器</title>
</head>
<body>
<table>
<tr>
<td colspan="4"><input id="show" value="0"/></td>
</tr>
<tr>
<td><button onclick="number(this)" value="7">7</button></td>
<td><button onclick="number(this)" value="8">8</button></td>
<td><button onclick="number(this)" value="9">9</button></td>
<td><button onclick="calsym(this)" value="+">+</button></td>
</tr>
<tr>
<td><button onclick="number(this)" value="4">4</button></td>
<td><button onclick="number(this)" value="5">5</button></td>
<td><button onclick="number(this)" value="6">6</button></td>
<td><button onclick="calsym(this)" value="-">-</button></td>
</tr>
<tr>
<td><button onclick="number(this)" value="1">1</button></td>
<td><button onclick="number(this)" value="2">2</button></td>
<td><button onclick="number(this)" value="3">3</button></td>
<td><button onclick="calsym(this)" value="*">*</button></td>
</tr>
<tr>
<td><button onclick="number(this)" value="0">0</button></td>
<td><button onclick="calsym(this)" value="=">=</button></td>
<td><button onclick="clearCal()" value="c">c</button></td>
<td><button onclick="calsym(this)" value="/">/</button></td>
</tr>
</table>
</body>
<script type="text/javascript" src="jquery-1.9.1.js"></script>
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script type="text/javascript">
var num0 = null;
var num1 = null;
var symble = null;
var lastclick = null;
var symarr = new Array(); //符号集合
symarr[0] = '+';
symarr[1] = '/';
symarr[2] = '*';
symarr[3] = '-';
symarr[4] = '=';
function number(n){
var numnow = $('#show');
var _exist=$.inArray(lastclick,symarr); //判断上次点击是否为符号
if (numnow.val() == 0 || _exist != -1) {//若显示框为0 或者上次点击为符号，则重新记录显示框
numnow.val($(n).val());
}else{
numnow.val(parseInt(numnow.val()) * 10 +parseInt($(n).val()));
}
lastclick = $(n).val(); // 更新上次点击
} function calsym(cs){ //符号点击事件响应
var numnow = $('#show');
var _exist=$.inArray(lastclick,symarr);
if (num0 == null && symble == null) { //初始状态
