简单的计算器代码

作为初学者能写出一个简单的程序再开心不过了。下面小编给大家介绍一个简单的计算器代码程序。

<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />

<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;}

{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>

<p id="box">

<p class="sum">

<input id="process" name="process" type="text" value="0" /></p>

<p class="sum">

SUM:<input id="sum" name="sum" type="text" value="0" /></p>

<p>

<span class="d_num" data-num="1">1</span> <span class="d_num" data-num="2">2</span> <span class="d_num" data-num="3">3</span> <span class="d_num" data-num="&lt;-">&lt;-</span> <span class="d_num" data-num="C">C</span></p>

<p>

<span class="d_num" data-num="4">4</span> <span class="d_num" data-num="5">5</span> <span class="d_num" data-num="6">6</span> <span class="d_num" data-num="*">*</span> <span class="d_num" data-num="/">/</span></p>

<p>

<span class="d_num" data-num="7">7</span> <span class="d_num" data-num="8">8</span> <span class="d_num" data-num="9">9</span> <span class="d_num" data-num="+">+</span> <span class="d_num" data-num="-">-</span></p>

<p>

<span class="d_num" data-num="0">0</span> <span class="d_num" data-num="00">00</span> <span class="d_num" data-num=".">.</span> <span class="d_num" data-num="%">%</span> <span class="d_num" data-num="=">=</span></p>

</p>

<script type="text/javascript">

var $box = lementById('box');

var $sum = lementById('sum');

var $process = lementById('process');

var sum = 0, process = '', num1 = '', num2 = '', temp = '', statu = false;

$ick = function(e){

var event = t || e;

var ele = lement || et;

var _className = sName;

if(_className == 'd_num'){

var num = ttribute('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;

}

$e = 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 = '';

$e = '0';

$e = '0';