search

Home >Web Front-end >JS Tutorial >Simple calculator code program written in js_javascript skills

Simple calculator code program written in js_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:47:191410browse

I’ll show you a simple calculator code program I wrote recently

Share the code as follows

<!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>

Now it is just a simple standard calculator that can perform continuous operations of addition, subtraction, multiplication and division, as well as remainder operations. If a zero dividend error occurs, a prompt will be given below, like this:

This is a small program I designed. There are still many improvements, such as beautifying the interface, and I will continue to work hard.

The above is the entire content of this article, I hope it will be helpful to everyone’s study.

Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：Example code for voting based on js_javascript skillsNext article：Example code for voting based on js_javascript skills

Related articles

See more