用js编写的简单的计算器代码程序
发布于 2017-06-22 02:56:21 | 112 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
这篇文章主要介绍了用js编写的简单的计算器代码程序，非常具有实用性,感兴趣的小伙伴可以参考下
最近编写的一个简单的计算器代码程序，先给大家展示一下
分享代码如下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
#box{width: 295px; margin: 0 auto; text-align: justify; border: 1px solid #ddd; padding: 15px;}
.d_num{display: inline-block; margin: 10px; width: 33px; height: 30px; border: 1px solid #ddd; text-align: center; line-height: 30px; cursor: pointer;}
.sum{margin: 0 10px 10px; line-height: 30px; font-size: 20px;}
#sum{width: 205px; height: 30px; padding: 0 5px; margin-left: 5px; font-size: 20px;}
#process{width: 255px; height: 30px; padding: 0 5px; margin-left: 5px; font-size: 20px;}
</style>
</head>
<body>
<div id="box">
<div class="sum">
<input type="text" name="process" id="process" value="0" />
</div>
<div class="sum">
SUM:<input type="text" name="sum" id="sum" value="0" />
</div>
<div>
<span data-num="1" class="d_num">1</span>
<span data-num="2" class="d_num">2</span>
<span data-num="3" class="d_num">3</span>
<span data-num="<-" class="d_num"><-</span>
<span data-num="C" class="d_num">C</span>
</div>
<div>
<span data-num="4" class="d_num">4</span>
<span data-num="5" class="d_num">5</span>
<span data-num="6" class="d_num">6</span>
<span data-num="*" class="d_num">*</span>
<span data-num="/" class="d_num">/</span>
</div>
<div>
<span data-num="7" class="d_num">7</span>
<span data-num="8" class="d_num">8</span>
<span data-num="9" class="d_num">9</span>
<span data-num="+" class="d_num">+</span>
<span data-num="-" class="d_num">-</span>
</div>
<div>
<span data-num="0" class="d_num">0</span>
<span data-num="00" class="d_num">00</span>
<span data-num="." class="d_num">.</span>
<span data-num="%" class="d_num">%</span>
<span data-num="=" class="d_num">=</span>
</div>
</div>
<script type="text/javascript">
var $box = document.getElementById('box');
var $sum = document.getElementById('sum');
var $process = document.getElementById('process');
var sum = 0, process = '', num1 = '', num2 = '', temp = '', statu = false;
$box.onclick = function(e){
var event = window.event || e;
var ele = event.srcElement || event.target;
var _className = ele.className;
if(_className == 'd_num'){
var num = ele.getAttribute('data-num');//点击的按钮对应的值
var NotNum = isNaN(num);
if(!NotNum || num == '.'){ //点击了数字
if(!statu){ //还没点击过符号
if(num1 == '0'){
num1 = '';
}
num1 += num;
process = num1;
}else{ //已经点击过符号
if(num2 == '0'){
num2 = '';
}
num2 += num;
process = num1 + temp + num2;
}
$process.value = process;
}
else{ //点击了符号
if(num1 == ''){//非法操作
return false;
}
if(num == 'C'){//归零
num1 = '';
num2 = '';
process = '';
temp = '';
sum = '';
$process.value = '0';
$sum.value = '0';
statu = false;
return false;
}
if(num == '<-'){//退档
if(sum != ''){
return false;
}
if(num2 == ''){
; num1 = num1.substring(0,num1.length-1);
if(num1 == ''){
num1 = '0';
}
process = num1;
$process.value = process;
}else{
num2 = num2.substring(0,num2.length-1);
if(num2 == ''){
num2 = '0';
}
process = num1 + temp + num2;
$process.value = process;
}
return false;
}
if(num2 != ''){//a&b
if(num == '='){//元操作到此结束
$process.value = process;
}else{
$process.value = process + num;
}
switch(temp){//元操作继续
case '+' : sum = parseFloat(num1) + parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;
case '-' : sum = parseFloat(num1) - parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;
case '*' : sum = parseFloat(num1) * parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;
case '/' : sum = parseFloat(num1) / parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;
case '%' : sum = parseFloat(num1) % parseFloat(num2); $sum.value = sum; $process.value = process; num1 = sum + ''; num2 = ''; break;
}
}else{//a&？
if(num == '='){
return false;
}
$process.value = process + num;
process = '';
}
if(num == '='){
sum = '';
statu = false;
return false;
}
temp = num;//记录操作符
statu = true;//已经触发操作状态
}
}
};
</script>
</div>
</body>
</html> 现在只是个简单的标准计算器，能进行加减乘除连续运算，以及求余运算。如果发生被除数为零的错误，下面会给出提示，就像这样：
这就是我设计的一个小程序，还有许多改进的地方，比如界面的美化，会再接再厉。
以上就是本文的全部内容，希望对大家的学习有所帮助。
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