用js编写的简单的计算器代码程序

前端技术 2023/09/05 JavaScript

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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