您的位置：首页 > Web前端 > JavaScript

JavaScript简易计算器

2016-03-05 21:18 555 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS计算器</title>
<link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body style="margin:50px">
<div class="form-group">
<div class="col-sm-3">
<input type="text" id="sum1" class="form-control" placeholder="请输入第一个数">
</div>
<div class="col-sm-2">
<select id="sign" class="form-control">
<option>加</option>
<option>减</option>
<option>乘</option>
<option>除</option>
<option>取余</option>
</select>
</div>
<div class="col-sm-3">
<input type="text" id="sum2" placeholder="请输入第二个数" class="form-control">
</div>
<div class="col-sm-1">
<button id="equal" class="btn btn-info" style="width:100%;" onclick="equals()">=</button>
</div>
<div class="col-sm-3">
<label id="count"class="form-control"></label>
</div>
</div>

<script type="text/javascript">
var sum1;
var sum2;
var sign;
var fruit;
function equals(){
sum1 = parseInt(document.getElementById("sum1").value);
sum2 = parseInt(document.getElementById("sum2").value);
if (isNaN(sum1) || isNaN(sum2)) {
document.getElementById("count").innerHTML = "您输入的不是数字，请重新输入!";
}else{
sign = document.getElementById("sign").value;

switch(sign){
case '加':
fruit = sum1 + sum2;
break;
case '减':
fruit = sum1 - sum2;
break;
case '乘':
fruit = sum1 * sum2;
break;
case '除':
if (sum2 == 0) {
fruit = "被除数不能为0，请重新输入!";
break;
}else{
fruit = sum1 / sum2;
break;
}
case '取余':
fruit = sum1 % sum2;
break;
}
document.getElementById("count").innerHTML = fruit;
};
}
</script>
</body>
</html>

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航