<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8" />
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
<style>
input[type='text']{
width:400px;
height:22px;
font-size:20px;
line-height:22px;
background-color:aqua;
border-color:navy;
color:orange;
}
input[type='button']{
width:44px;
height:44px;
margin:4px;
padding:0;
border-radius:10px;
}
</style>
<script>
$(function(){
$(".calc input").click(function(){
try{
if($(this).val() == "C"){
$("#result").val("");
}
else if($(this).val() == "="){
$("#result").val(eval($("#result").val()));
}
else if($(this).val() == "B"){
var res = $("#result").val();
res = res.substring(0,res.length-1);
$("#result").val(res);
}
else{
$("#result").val($("#result").val() + $(this).val());
}
}
catch(e) {
$("#result").val("");
console.log(e);
}
});
});
</script>
</head>
<body>
<div>
<input type="text" id="result" disabled>
</div>
<div class="calc">
<input type="button" value="7">
<input type="button" value="8">
<input type="button" value="9">
<input type="button" value="/">
</div>
<div class="calc">
<input type="button" value="4">
<input type="button" value="5">
<input type="button" value="6">
<input type="button" value="*">
</div>
<div class="calc">
<input type="button" value="1">
<input type="button" value="2">
<input type="button" value="3">
<input type="button" value="4">
</div>
<div class="calc">
<input type="button" value="5">
<input type="button" value="00">
<input type="button" value="%">
<input type="button" value="-">
</div>
<div class="calc">
<input type="button" value=".">
<input type="button" value="B">
<input type="button" value="C">
<input type="button" value="=">
</div>
</body>
</html>