<!DOCTYPE html>
<html>
<head>
<meta charset="utf8"/>
<title>Javascript計(jì)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(); //符號(hào)集合
symarr[0] = '+';
symarr[1] = '/';
symarr[2] = '*';
symarr[3] = '-';
symarr[4] = '=';
function number(n){
var numnow = $('#show');
var _exist=$.inArray(lastclick,symarr); //判斷上次點(diǎn)擊是否為符號(hào)
if (numnow.val() == 0 || _exist != -1) {//若顯示框?yàn)? 或者上次點(diǎn)擊為符號(hào)，則重新記錄顯示框
numnow.val($(n).val());
}else{
numnow.val(parseInt(numnow.val()) * 10 +parseInt($(n).val()));
}
lastclick = $(n).val(); // 更新上次點(diǎn)擊
}
function calsym(cs){ //符號(hào)點(diǎn)擊事件響應(yīng)
var numnow = $('#show');
var _exist=$.inArray(lastclick,symarr);
if (num0 == null && symble == null) { //初始狀態(tài)
num0 = numnow.val();
symble = $(cs).val();
}else if(num0 != null && num1 == null && _exist !=-1){ // 連續(xù)點(diǎn)操作符的處理，及第一次點(diǎn)擊操作符處理
symble = $(cs).val();
}else{ //正常計(jì)算狀態(tài)
num1 = numnow.val();
var result = calculate(symble,num0,num1);
symble = $(cs).val(); //上行及本行：先計(jì)算之前的運(yùn)算符及結(jié)果，再更新運(yùn)算符為本次點(diǎn)擊
num0 = result;
numnow.val(result);
num1 = null;
}
lastclick = $(cs).val(); // 更新上次點(diǎn)擊
}
function clearCal(){ //清空函數(shù)
$('#show').val('0');
num0 = null;
num1 = null;
symble = null;
lastclick = null;
}
function calculate(sym,m,n){ //計(jì)算并返回結(jié)果
var res = null;
m = parseInt(m);
n = parseInt(n);
switch(sym){
case '+':
res = m+n;
break;
case '-':
res = m-n;
break;
case '*':
res = m*n;
break;
case '/':
if (n == 0) {
alert("false");
break;
}
res = m/n;
break;
default:
break;
}
return res;
}
</script>
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