用js编写的简单的计算器代码程序

2019-11-20 11:55:27

字体：大中小

来源：转载

供稿：网友

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：