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簡單的計算器代碼
作為初學者能寫出一個簡單的程序再開心不過了。下面小編給大家介紹一個簡單的計算器代碼程序。
<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;}
.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>
<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="<-"><-</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 = 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');//點擊的按鈕對應的值
var NotNum = isNaN(num);
if(!NotNum || num == '.'){ //點擊了數字
if(!statu){ //還沒點擊過符號
if(num1 == '0'){
num1 = '';
}
num1 += num;
process = num1;
}else{ //已經點擊過符號
if(num2 == '0'){
num2 = '';
}
num2 += num;
process = num1 + temp + num2;
}
$process.value = process;
}
else{ //點擊了符號
if(num1 == ''){//非法操作
return false;
}
if(num == 'C'){//歸零
num1 = '';
num2 = '';
process = '';
temp = '';
sum = '';
$process.value = '0';
$sum.value = '0';
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statu = false;
return false;
}
if(num == '<-'){//退檔
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 == '='){//元操作到此結束
$process.value = process;
}else{
$process.value = process + num;
}
switch(temp){//元操作繼續
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;//記錄操作符
statu = true;//已經觸發操作狀態
}
}
};
</script>
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