<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>简易计算器</title>
<style type="text/css">
table{
width: 400px;
height: 250px;
border:1px solid #e1e1e1;
border-collapse: collapse;
margin: 10px auto;
}
td{
border:1px solid #e1e1e1;
padding-left: 4px;
}
th{
font-size: 20px;
}
input[type=text]{
width: 200px;
height: 25px;
border:1px solid #a2c5ec;
margin-left: 10px;
}
input[type=button]{
width: 60px;
height: 30px;
background: #a2c5ec;
margin-left: 6px;
margin-top: 5px;
border:1px solid #a2c5ec;
}
</style>
<script type="text/javascript">
function computer(op){
var num1=document.getElementById('num1').value;
var num2=document.getElementById('num2').value;
var n1=parseInt(num1);
var n2=parseInt(num2);
var res='';
switch(op){
case '+':
res=n1+n2;
break;
case '-':
res=n1-n2;
break;
case '*':
res=n1*n2;
break;
case '/':
res=n1/n2;
break;
default:
}
document.getElementById('result').value=res;
}
</script>
</head>
<body>
<table>
<tr>
<th colspan="3">简易计算器</th>
</tr>
<tr>
<td>第一个数</td>
<td><input type="text" id="num1"></td>
<td rowspan="4">
<input type="button" value="+" onclick="computer('+')"><br>
<input type="button" value="-" onclick="computer('-')"><br>
<input type="button" value="*" onclick="computer('*')"><br>
<input type="button" value="/" onclick="computer('/')">
</td>
</tr>
<tr>
<td>第二个数</td>
<td><input type="text" id="num2"></td>
</tr>
<tr>
<td>结果</td>
<td><input type="text" id="result"></td>
</tr>
<tr>
<td colspan="2">运算方法：先两个数，在选择算法</td>
</tr>
</table>
</body>
</html>