用js编写的简单的计算器代码程序

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。