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> <div> <input type="text" value="0" /> </div> <div> SUM:<input type="text" value="0" /> </div> <div> <span data-num="1">1</span> <span data-num="2">2</span> <span data-num="3">3</span> <span data-num="<-"><-</span> <span data-num="C">C</span> </div> <div> <span data-num="4">4</span> <span data-num="5">5</span> <span data-num="6">6</span> <span data-num="*">*</span> <span data-num="https://www.jb51.net/">/</span> </div> <div> <span data-num="7">7</span> <span data-num="8">8</span> <span data-num="9">9</span> <span data-num="+">+</span> <span data-num="-">-</span> </div> <div> <span data-num="0">0</span> <span data-num="00">00</span> <span data-num=".">.</span> <span data-num="%">%</span> <span data-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 'https://www.jb51.net/' : 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。