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javascript 简单的计算器

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="jisuanqi.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <title>简单计算器</title> <head>     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />     <style type="text/css">         body         {             font-size: 12px;             font-family: Arial, Georgia, "Times New Roman" , Times, serif;             color: #555;             text-align: center;             background-color: #e2e2e2;         }         h6         {             margin: 0;             font-size: 12px;         }         #calculator         {             width: 240px;             height: auto;             overflow: hidden;             margin: 10px auto;             border: #fff 1px solid;             padding-bottom: 10px;             background-color: #f2f2f2;         }         #calculator div         {             clear: both;         }         #calculator ul         {             padding: 0;             margin: 5px 14px;             border: #fff 1px solid;             height: auto;             overflow: hidden;         }         #calculator li         {             list-style: none;             float: left;             width: 32px;             height: 32px;             margin: 5px;             display: inline;             line-height: 32px;             font-size: 14px;             background-color: #eaeaea;         }         #calculator li.tool         {             background-color: #e2e2e2;         }         #calculator li:hover         {             background-color: #f9f9f9;             cursor: pointer;         }         #calculator li:active         {             background-color: #fc0;             cursor: pointer;         }         #calculator li.tool:active         {             background-color: #d8e8ff;             cursor: pointer;         }         #calcu-head         {             text-align: left;             padding: 10px 15px 5px;         }         span.imyeah         {             float: right;             color: #ccc;         }         span.imyeah a         {             color: #ccc;         }         .screen         {             width: 200px;             height: 24px;             line-height: 24px;             padding: 4px;             border: #e6e6e6 1px solid;             border-bottom: #f2f2f2 1px solid;             border-right: #f2f2f2 1px solid;             margin: 10px auto;             direction: ltr;             text-align: right;             font-size: 16px;             color: #999;         }         #calcu-foot         {             text-align: left;             padding: 10px 15px 5px;             height: auto;             overflow: hidden;         }         span#note         {             float: left;             width: 210px;             height: auto;             overflow: hidden;             color: red;         }         span.welcome         {             clear: both;             color: #999;         }         span.welcome a         {             float: right;             color: #999;         }     </style>     <script type="text/javascript">         var num = 0, result = 0, numshow = "0";         var operate = 0; //判断输入状态的标志         var calcul = 0; //判断计算状态的标志         var quit = 0; //防止重复按键的标志         function command(num) {             var str = String(document.calculator.numScreen.value); //获得当前显示数据             str = (str != "0") ? ((operate == 0) ? str : "") : ""; //如果当前值不是"0",且状态为0,则返回当前值,否则返回空值;             str = str + String(num); //给当前值追加字符             document.calculator.numScreen.value = str; //刷新显示             operate = 0; //重置输入状态             quit = 0; //重置防止重复按键的标志         }         function dzero() {             var str = String(document.calculator.numScreen.value);             str = (str != "0") ? ((operate == 0) ? str + "00" : "0") : "0"; //如果当前值不是"0",且状态为0,则返回当str+"00",否则返回"0";             document.calculator.numScreen.value = str;             operate = 0;         }         function dot() {             var str = String(document.calculator.numScreen.value);             str = (str != "0") ? ((operate == 0) ? str : "0") : "0"; //如果当前值不是"0",且状态为0,则返回当前值,否则返回"0";             for (i = 0; i <= str.length; i++) { //判断是否已经有一个点号                 if (str.substr(i, 1) == ".") return false; //如果有则不再插入             }             str = str + ".";             document.calculator.numScreen.value = str;             operate = 0;         }         function del() { //退格             var str = String(document.calculator.numScreen.value);             str = (str != "0") ? str : "";             str = str.substr(0, str.length - 1);             str = (str != "") ? str : "0";             document.calculator.numScreen.value = str;         }         function clearscreen() { //清除数据             num = 0;             result = 0;             numshow = "0";             document.calculator.numScreen.value = "0";         }         function plus() { //加法             calculate(); //调用计算函数             operate = 1; //更改输入状态             calcul = 1; //更改计算状态为加         }         function minus() { //减法             calculate();             operate = 1;             calcul = 2;         }         function times() { //乘法             calculate();             operate = 1;             calcul = 3;         }         function divide() { //除法             calculate();             operate = 1;             calcul = 4;         }         function persent() { //求余             calculate();             operate = 1;             calcul = 5;         }         function equal() {             calculate(); //等于             operate = 1;             num = 0;             result = 0;             numshow = "0";         }         //         function calculate() {             numshow = Number(document.calculator.numScreen.value);             if (num != 0 && quit != 1) { //判断前一个运算数是否为零以及防重复按键的状态                 switch (calcul) { //判断要输入状态                     case 1: result = num + numshow; break; //计算"+"                     case 2: result = num - numshow; break; //计算"-"                     case 3: result = num * numshow; break;                     case 4: if (numshow != 0) { result = num / numshow; } else { document.getElementById("note").innerHTML = "被除数不能为零!"; setTimeout(clearnote, 4000) } break;                     case 5: result = num % numshow; break;                 }                 quit = 1; //避免重复按键             }             else {                 result = numshow;             }             numshow = String(result);             document.calculator.numScreen.value = numshow;             num = result; //存储当前值         }         function clearnote() { //清空提示             document.getElementById("note").innerHTML = "";         }     </script> </head> <body>     <div id="calculator">         <div id="calcu-head">           <center>                 简单的计算器</center>         </div>         <form name="calculator" action="" method="get">         <div id="calcu-screen">             <!--配置显示窗口,使用onfocus="this.blur();"避免键盘输入-->             <input type="text" name="numScreen" class="screen" value="0" onfocus="this.blur();" />         </div>         <div id="calcu-btn">             <ul>                 <!--配置按钮-->                 <li onclick="command(7)">7</li>                 <li onclick="command(8)">8</li>                 <li onclick="command(9)">9</li>                 <li class="tool" onclick="del()">←</li>                 <li class="tool" onclick="clearscreen()">C</li>                 <li onclick="command(4)">4</li>                 <li onclick="command(5)">5</li>                 <li onclick="command(6)">6</li>                 <li class="tool" onclick="times()">×</li>                 <li class="tool" onclick="divide()">÷</li>                 <li onclick="command(1)">1</li>                 <li onclick="command(2)">2</li>                 <li onclick="command(3)">3</li>                 <li class="tool" onclick="plus()">+</li>                 <li class="tool" onclick="minus()">-</li>                 <li onclick="command(0)">0</li>                 <li onclick="dzero()">00</li>                 <li onclick="dot()">.</li>                 <li class="tool" onclick="persent()">%</li>                 <li class="tool" onclick="equal()">=</li>             </ul>         </div>         <div id="calcu-foot">             <span id="note"></span><span class="welcome">欢迎使用javascript计算器!</span>         </div>         </form>     </div> </body> </html>

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