<!DOCTYPE html>
<html>
 
 <head>
 <meta charset="UTF-8">
 <title></title>
 <style type="text/css">
 #show {
 width: 232px;
 height: 80px;
 color: white;
 border-radius: 5px 5px 0 0;
 background-color: rgba(127, 128, 127, 1);
 text-align: right;
 border: none;
 font-size: 45px;
 outline: none;
 }
 
 table {
 border: 1px solid black;
 border-collapse: collapse;
 width: 234px;
 text-align: center;
 font-size: 30px;
 }
 
 td {
 height: 55px;
 width: 57.5px;
 background-color: wheat;
 }
 
 td:active {
 background-color: coral;
 }
 
 .aperation {
 background-color: rgb(245, 146, 62);
 color: white;
 }
 
 #ape {
 background-color: wheat;
 color: #000000;
 }
 </style>
 </head>
 
 <body>
 <div id="">
 <input type="" id="show" />
 <table border="1">
 <tr>
  <td id="clear">AC</td>
  <td>+/-</td>
  <td class="aperation" id="ape">%</td>
  <td class="aperation">/</td>
 </tr>
 <tr>
  <td class="num">7</td>
  <td class="num">8</td>
  <td class="num">9</td>
  <td class="aperation">*</td>
 </tr>
 <tr>
  <td class="num">4</td>
  <td class="num">5</td>
  <td class="num">6</td>
  <td class="aperation">-</td>
 </tr>
 <tr>
  <td class="num">1</td>
  <td class="num">2</td>
  <td class="num">3</td>
  <td class="aperation">+</td>
 </tr>
 <tr>
  <td colspan="2" class="num">0</td>
 
  <td>.</td>
  <td class="aperation" id="result">=</td>
 </tr>
 </table>
 </div>
 </body>
 <script type="text/javascript">
 //獲取數(shù)字的集合
 var nums = document.getElementsByClassName("num");
 //獲取操作符的集合
 var options = document.getElementsByClassName("aperation");
 //獲取等號
 var result = document.getElementById("result");
 //獲取歸0
 var clear = document.getElementById("clear");
 //獲取展示框
 var show = document.getElementById("show");
 //聲明用于保存內(nèi)容的三個變量
 var numValue = ""; //存儲數(shù)字
 var optionC = ""; //存儲操作符
 var numTemp = ""; //存儲暫存值
 
 //點擊數(shù)字鍵時 觸發(fā)事件
 for(var i = 0; i < nums.length; i++) {
 nums[i].onclick = function() {
 if(numValue == "0") {
  numValue = "";
 }
 numValue += this.innerHTML;
 show.value = numValue;
 
 }
 }
 
 //點擊操作鍵觸發(fā)事件
 for(var i = 0; i < options.length - 1; i++) {
 options[i].onclick = function() {
 //先存儲之前記錄的數(shù)字
 numTemp = numValue;
 //記錄操作符
 optionC = this.innerHTML;
 //清除原有記錄的數(shù)字
 numValue = "";
 
 }
 }
 //等號操作
 result.onclick = function() {
 show.value = eval(numTemp + optionC + numValue);
 }
//清零操作
 clear.onclick = function() {
 show.value = "0";
 numValue = "";
 optionC = "";
 numTemp = "";
 }
 </script>
 
</html>

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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