js计算器---转

至今见过的一个还没问题的计算器,收藏在此.

转自javascript写的简单的计算器原文链接,谢分享!

js部分

 ar 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="";
 } 

html部分

 <body>
 <div id="calculator">
 <div id="calcu-head"><span class="imyeah">© <a href="http://www.cnblogs.com/imyeah/" target="_blank">I'm Yeah!</a></span><h6>简单的计算器</h6></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！<a href="http://www.cnblogs.com/imyeah" target="_blank">反馈</a></span>
 </div>
 </form>
 </div>
 </body> 

css部分

 body {
 font-size:12px;
 font-family:Arial, Georgia, "Times New Roman", Times, serif;
 color:#555;
 text-align:center;
 background-color:#e2e2e2;
 }
 h6{
 margin:;
 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:;
 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;
 }