JS编写的科学计算器
最近半个月编写了一个JS+ＣＳＳ＋ＨＴＭＬ的网页计算器，从最初的具有简陋界面的简单计算器改版到最终具有科学／标准计算器转换功能并且界面非常友好的计算器，收获良多！总的来说，代码简单，通俗易读，下面贴上代码，供前端新手学习！欢迎提出宝贵意见，不吝指正！
ＨＴＭＬ代码（代码中仅仅是计算器界面内容布局）：
<html><head> <title>计算器</title> <link href="style.css" rel="stylesheet" type="text/css"/> <script src="script.js"></script> </head> <body> <div id="calculator"> <a href="http://write.blog.csdn.net/postlist" id='record'>计Sweet Smile</a> <div > <textarea type="text" id="result0" οnfοcus="this.blur();"></textarea> <textarea type="text" id="result" οnfοcus="this.blur();"></textarea> </div> <div> <section > <!--包含按钮的一个长形区域--> <div οnclick="styleChange()"> <!--包含按钮的一个较小长形区域--> <input type="checkbox"/> <label>科学标准</label> <!--按钮底部的灰色滑动区--> </div> </section> </div> <!--标准计算器布局--> <div id="rows" > <div > <button id="bt1" οnclick="zero()">C</button> <button id="bt2" οnclick="back()">DEL</button> <button id="bt3" οnclick="divide()">÷</button> <button id="bt4" οnclick="times()">×</button> </div> <div > <button id="bt5" οnclick="num(7)">7</button> <button id="bt6" οnclick="num(8)">8</button> <button id="bt7" οnclick="num(9)">9</button> <button id="bt8" οnclick="plus()">+</button> </div> <div > <button id="bt9" οnclick="num(4)">4</button> <button id="bt10" οnclick="num(5)">5</button> <button id="bt11" οnclick="num(6)">6</button> <button id="bt12" οnclick="minus()">-</button> </div> <div id="below"> <div id="left"> <div > <button id="bt13" οnclick="num(1)">1</button> <button id="bt14" οnclick="num(2)">2</button> <button id="bt15" οnclick="num(3)">3</button> </div> <div > <button id="bt16" οnclick="num(0)">0</button> <button id="bt17" οnclick="dot()">.</button> </div> </div> <div id="right"> <button id="bt18" οnclick="equal()">=</button> </div> </div> </div> <!--科学计算器布局--> <div id="sci" > <div > <button id="bt21" οnclick="zero()">C</button> <button id="bt22" οnclick="back()">DEL</button> <button id="bt23" οnclick="pow1()">^</button> <button id="bt24" οnclick="num('π')">π</button> <button id="bt25" οnclick="pow2()">√</button> </div> <div > <button id="bt26" οnclick="sin()">sin</button> <button id="bt27" οnclick="num('(')">(</button> <button id="bt28" οnclick="num(')')">)</button> <button id="bt29" οnclick="divide1()">1/X</button> <button id="bt30" οnclick="divide()">÷</button> </div> <div > <button id="bt31" οnclick="cos()">cos</button> <button id="bt32" οnclick="num(7)">7</button> <button id="bt33" οnclick="num(8)">8</button> <button id="bt34" οnclick="num(9)">9</button> <button id="bt35" οnclick="times()">×</button> </div> <div > <button id="bt36" οnclick="tan()">tan</button> <button id="bt37" οnclick="num(4)">4</button> <button id="bt38" οnclick="num(5)">5</button> <button id="bt39" οnclick="num(6)">6</button> <button id="bt40" οnclick="minus()">-</button> </div> <div > <button id="bt41" οnclick="ln()">ln</button> <button id="bt42" οnclick="num(1)">1</button> <button id="bt43" οnclick="num(2)">2</button> <button id="bt44" οnclick="num(3)">3</button> <button id="bt45" οnclick="plus()">+</button> </div> <div > <button id="bt46" οnclick="log()">log</button> <button id="bt47" οnclick="num(0)">0</button> <button id="bt48" οnclick="dot()">.</button> <button id="bt49" οnclick="quyu()">%</button> <button id="bt50" οnclick="equal()">=</button> </div> </div> </div> </body></html>下面是ＪＳ代码（代码语句都是非常简单的基础语法）：
//改进： 定义一个变量记录"="的输入与否而不必每输入数字时都要检索一遍文本框内容 var status=0; //标记所输入的是数字还是运算符号var calcu=0; //标记所要执行的方法是哪一个 /*数字、括号及PI的输入*/function num(x){ var str0=document.getElementById('result0').value; var str=document.getElementById('result').value; if(str0.indexOf("=")>0){ document.getElementById('result0').value=''; document.getElementById('result').value='0'; str=document.getElementById('result').value; } if(str=="0") str=''; str+=String(x); document.getElementById('result').value=str; status=0;}//输入. （未做是否包含"."的判断）function dot(){ var str0=document.getElementById('result0').value; var str=document.getElementById('result').value; if(str0.indexOf("=")>0){ document.getElementById('result0').value=''; document.getElementById('result').value='0'; str=document.getElementById('result').value; } str=str+'.'; document.getElementById('result').value=str;} /*三角函数以及'1/'计算*/function sin(){ calcu=1; cal();}function cos(){ calcu=2; cal();}function tan(){ calcu=3; cal();}function divide1(){ calcu=4; cal();}function ln(){ calcu=5; cal();}function log(){ calcu=6; cal();}function cal(){ var str0=document.getElementById('result0').value; var str=document.getElementById('result').value; if(str0.indexOf("=")>0){ document.getElementById('result0').value=''; document.getElementById('result').value='0'; str=document.getElementById('result').value; } if(str=="0") str=''; switch(calcu){ case 1: str+=String("sin(");break; case 2: str+=String("cos(");break; case 3: str+=String("tan(");break; case 4: str+=String("1/");break; case 5: str+=String("ln(");break; case 6: str+=String("log(");break; } document.getElementById('result').value=str; status=1;} /* ^、√以及%的输入 */function pow1(){ calcu=1; powS();}function pow2(){ calcu=2; powS();}function quyu(){ calcu=3; powS();}function powS(){ if(status == 1) return; var strpow0=document.getElementById('result0').value; var strpow=document.getElementById('result').value; if(strpow0.indexOf("=")>0){ document.getElementById('result0').value=''; /*document.getElementById('result').value='0';*/ strpow=document.getElementById('result').value; } switch(calcu){ case 1: strpow+=String('^'); break; case 2: if(strpow=='0') strpow="√"; else{ strpow+=String('√'); } break; case 3: strpow+=String("%"); break; } document.getElementById('result').value=strpow; status=1;} /* +-×÷ 运算 */function plus(){ calcu=1; calculate();}function times(){ calcu=2; calculate();}function divide(){ calcu=3; calculate(); }function calculate(){ if(status==1) return; var str0=document.getElementById('result0').value; var str=document.getElementById('result').value; if(str0.indexOf("=")>0 ){ document.getElementById('result0').value=''; /*document.getElementById('result').value='0';*/ str=document.getElementById('result').value; } if(str=='') str='0'; switch(calcu){ case 1: str+='+';break; case 2: str+='×';break; case 3: str+='÷';break; } document.getElementById('result').value=str; status=1;}function minus(){ var str0=document.getElementById('result0').value; var str=document.getElementById('result').value; if(str0.indexOf("=")>0){ document.getElementById('result0').value=''; /*document.getElementById('result').value='-';*/ str=document.getElementById('result').value+'-'; } else str+='-'; document.getElementById('result').value=str;} //显示屏字符串为空function zero(){ document.getElementById('result0').value=""; document.getElementById('result').value="0";} //显示屏字符串减去最后一个字符function back(){ var str0=document.getElementById('result0').value; var str=document.getElementById('result').value; if(str0.indexOf("=")>0 || str=='') return; var str1=str.substr(0,(str.length)-1) document.getElementById('result').value=str1;} //获取当前显示屏字符，判断所包含运算符，并做相关运算。function equal(){ var str0=document.getElementById('result').value; if(str0=="") return; var str=str0.replace(/×/g,'*'); //用正则表达式进行全部替换 str=str.replace(/÷/g,'/'); str=str.replace(/π/g,'Math.PI'); if(str.indexOf("sin")>=0){ str=str.replace(/sin/g,'Math.round(Math.sin'); str+='*1000000)/1000000'; document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(str); } else if(str.indexOf("cos")>=0){ str=str.replace(/cos/g,'Math.round(Math.cos'); str+='*1000000)/1000000'; document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(str); } else if(str.indexOf("tan")>=0){ str=str.replace(/tan/g,'Math.round(Math.tan'); str+='*1000000)/1000000'; document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(str); } else if(str.indexOf("^")>=0){ var pos=str0.indexOf('^'); var pow1=str0.substring(0,pos); var pow2=str0.substring(pos+1,str0.length+1); result=Math.pow(pow1, pow2); document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(result); } else if(str.indexOf("√")>=0){ var pos=str0.indexOf('√'); var pow1=str0.substring(0,pos); var pow2=str0.substring(pos+1,str0.length+1); if(pow1==''){ result=Math.pow(pow2,0.5); document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(result); } else{ result=Math.pow(pow2, 1/pow1); document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(result); } } else if(str.indexOf("ln")>=0){ var str=str0.replace(/ln/g,'Math.round(Math.log'); str+='*1000000)/1000000'; document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(str); } else if(str.indexOf("log")>=0){ var str=str0.replace(/log/g,'Math.log'); str+= '/Math.log(10)'; document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=eval(str); } else{ result=(eval(str)); document.getElementById('result0').value=str0.concat("="); document.getElementById('result').value=result; } var a=document.getElementById('result').value; if(a=="Infinity") document.getElementById('result').value='∞'; else if(a=="-Infinity") document.getElementById('result').value='-∞';}function styleChange(){ if(document.getElementById('rows').style.display=='inline'){ document.getElementById('rows').style.display='none'; document.getElementById('sci').style.display='inline'; } else if(document.getElementById('rows').style.display=='none'){ document.getElementById('rows').style.display='inline'; document.getElementById('sci').style.display='none'; }}下面是ＣＳＳ代码（其中按钮效果部分参考了纯ＣＳＳ滑动按钮特效代码）：
body { font-size:24px; font-family:Arial, Georgia, "Times New Roman", Times, serif; color:#555; text-align:center; background-color:#555; }body div{ align:center; margin-top:5px; } #calculator{ align:center; width:350px; height:550px; margin:10px auto; border:#fff 2px solid; overflow:hidden; background-color:#f2f2f2; } .rescult{ align:center; padding:10px 5px 0px 5px;}#result,#result0{ width:300px; height:40px; font-size:35px; text-align:right; direction:ltr; border:#C0C0C0; overflow:hidden; background-color:#C0C0C0; word-wrap : normal; }#result0{ font-size:25px;}section { float: left; width:100px; padding: 0px 200px 10px 20px; height: 50px;} .checkbox { position: relative; display: inline-block; } .checkbox label { font-size:20px; text-align: center; padding-top: 5px; width: 90px; height: 30px; position: relative; display: inline-block; border-radius: 46px; -webkit-transition: 0.4s; transition: 0.4s;}.checkbox label:after { content: ''; position: absolute; padding-top: 20px; width: 45px; height: 20px; border-radius: 40%; left: 0; top: -5px; z-index: 2; background: #f2f2f2; box-shadow: 0 0 5px rgba(0, 0, 0, 0.2); -webkit-transition: 0.4s; transition: 0.4s;}.checkbox input { position: absolute; left: 0; top: 0; width: 100%; height: 100%; z-index: 5; opacity: 0; cursor: pointer; } .checkbox input:hover + label:after { box-shadow: 0 2px 15px 0 rgba(0, 0, 0, 0.2), 0 3px 8px 0 rgba(0, 0, 0, 0.2);}.checkbox input:checked + label:after { left: 45px; }.model-1 .checkbox input:checked + label { background:#ccc ; }.model-1 .checkbox input:checked + label:after { background:#f2f2f2; } #rows{ align:center; padding:0 3px; }#below{ margin-top:0px; margin-left:25px; margin-bottom: 30px; width:300px;}#left{ margin-top:0px; float:left;}#right{ margin-top:10px; float:right;}.row1,.row2,.row3,#below{ align:center; }.row3{ margin-bottom: 0px;}#bt1,#bt2,#bt3,#bt4,#bt5,#bt6,#bt7,#bt8,#bt9,#bt10,#bt11,#bt12,#bt13,#bt14,#bt15,#bt16,#bt17,#bt18{ font-size:18px; width:70px; height:70px; background-color:#eaeaea; cursor:pointer; }#bt16{ width:145px;}#bt18{ height:140px;}#sci{ display:none;}#sci button{ font-size:18px; width:55px; height:55px; background-color:#eaeaea; cursor:pointer; }#record{ float:right; font-size:15px; color:#555;}#record:hover{ color:red;}转载于：https://blog.csdn.net/sweet___smile/article/details/50417211
原文转载：http://www.shaoqun.com/a/504648.html
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最近半个月编写了一个JS+ＣＳＳ＋ＨＴＭＬ的网页计算器，从最初的具有简陋界面的简单计算器改版到最终具有科学／标准计算器转换功能并且界面非常友好的计算器，收获良多！总的来说，代码简单，通俗易读，下面贴上代码，供前端新手学习！欢迎提出宝贵意见，不吝指正！ＨＴＭＬ代码（代码中仅仅是计算器界面内容布局）：<html><head> <title>计算器</title
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