A calculator

A calculator

今天在某网站上发现了一个javascript的计算器，很有创意，而且功能也很强大。具体哪一个网站记不清了，代码纯为了学习研究，请作者见谅。

< HTML >< HEAD >< TITLE > 科学计算器 </ TITLE >
< META http - equiv = Content - Type content = " text/html; charset=gb2312 " ><!-- written by GoldHuman li hai --><!-- 2000.8 -->
< STYLE > BODY  {
    FONT - SIZE: 9pt; BACKGROUND - ATTACHMENT: fixed; COLOR: #0001fc; FONT - FAMILY:  " 宋体 " ,  " Arial " ,  " Times New Roman " ; BACKGROUND - COLOR: #edf0e1
}
TD  {
    FONT - SIZE: 9pt; FONT - FAMILY:  " 宋体 " ,  " Arial Narrow " ,  " Times New Roman " ; font - color: # 000000
}
</ STYLE >

< SCRIPT language = javascript >
<!--
var  endNumber = true
var  mem = 0
var  carry = 10
var  hexnum = " 0123456789abcdef "
var  angle = " d "
var  stack = ""
var  level = " 0 "
var  layer = 0


// 数字键

function  inputkey(key)
{
     var  index = key.charCodeAt( 0 );
     if  ((carry == 2   &&  (index == 48   ||  index == 49 ))
      ||  (carry == 8   &&  index >= 48   &&  index <= 55 )
      ||  (carry == 10   &&  (index >= 48   &&  index <= 57   ||  index == 46 ))
      ||  (carry == 16   &&  ((index >= 48   &&  index <= 57 )  ||  (index >= 97   &&  index <= 102 ))))
     if (endNumber)
     {
        endNumber = false
        document.calc.display.value  =  key
    }
     else   if (document.calc.display.value  ==   null   ||  document.calc.display.value  ==   " 0 " )
        document.calc.display.value  =  key
     else
        document.calc.display.value  +=  key
}

function  changeSign()
{
     if  (document.calc.display.value != " 0 " )
         if (document.calc.display.value.substr( 0 , 1 )  ==   " - " )
            document.calc.display.value  =  document.calc.display.value.substr( 1 )
         else
            document.calc.display.value  =   " - "   +  document.calc.display.value
}

// 函数键

function  inputfunction(fun,shiftfun)
{
    endNumber = true
     if  (document.calc.shiftf.checked)
        document.calc.display.value = decto(funcalc(shiftfun,(todec(document.calc.display.value,carry))),carry)
     else
        document.calc.display.value = decto(funcalc(fun,(todec(document.calc.display.value,carry))),carry)
    document.calc.shiftf.checked = false
    document.calc.hypf.checked = false     
    inputshift()
}

function  inputtrig(trig,arctrig,hyp,archyp)
{
     if  (document.calc.hypf.checked)
        inputfunction(hyp,archyp)
     else
        inputfunction(trig,arctrig)
}


// 运算符

function  operation(join,newlevel)
{
    endNumber = true
     var  temp = stack.substr(stack.lastIndexOf( " ( " ) + 1 ) + document.calc.display.value
     while  (newlevel != 0   &&  (newlevel <= (level.charAt(level.length - 1 ))))
     {
        temp = parse(temp)
        level = level.slice( 0 , - 1 )
    }
     if  (temp.match( /^ (. * \d[\ + \ - \ * \ / \ % \ ^ \ & \ | x]) ? ([ +- ] ? [ 0 - 9a - f\.] + )$ / ))
        document.calc.display.value = RegExp.$ 2
    stack = stack.substr( 0 ,stack.lastIndexOf( " ( " ) + 1 ) + temp + join
    document.calc.operator.value = "   " + join + "   "
    level = level + newlevel
    
}

// 括号

function  addbracket()
{
    endNumber = true
    document.calc.display.value = 0
    stack = stack + " ( "
    document.calc.operator.value = "     "
    level = level + 0
    
    layer += 1
    document.calc.bracket.value = " (= " + layer
}

function  disbracket()
{
    endNumber = true
     var  temp = stack.substr(stack.lastIndexOf( " ( " ) + 1 ) + document.calc.display.value
     while  ((level.charAt(level.length - 1 )) > 0 )
     {
        temp = parse(temp)
        level = level.slice( 0 , - 1 )
    }
    
    document.calc.display.value = temp
    stack = stack.substr( 0 ,stack.lastIndexOf( " ( " ))
    document.calc.operator.value = "     "
    level = level.slice( 0 , - 1 )

    layer -= 1
     if  (layer > 0 )
        document.calc.bracket.value = " (= " + layer
     else
        document.calc.bracket.value = ""
}

// 等号

function  result()
{
    endNumber = true
     while  (layer > 0 )
        disbracket()
     var  temp = stack + document.calc.display.value
     while  ((level.charAt(level.length - 1 )) > 0 )
     {
        temp = parse(temp)
        level = level.slice( 0 , - 1 )
    }

    document.calc.display.value = temp
    document.calc.bracket.value = ""
    document.calc.operator.value = ""
    stack = ""
    level = " 0 "
}


// 修改键

function  backspace()
{
     if  ( ! endNumber)
     {
         if (document.calc.display.value.length > 1 )
            document.calc.display.value = document.calc.display.value.substring( 0 ,document.calc.display.value.length  -   1 )
         else
            document.calc.display.value = 0
    }
}

function  clearall()
{
    document.calc.display.value = 0
    endNumber = true
    stack = ""
    level = " 0 "
    layer = ""
    document.calc.operator.value = ""
    document.calc.bracket.value = ""
}


// 转换键

function  inputChangCarry(newcarry)
{
    endNumber = true
    document.calc.display.value = (decto(todec(document.calc.display.value,carry),newcarry))
    carry = newcarry

    document.calc.sin.disabled = (carry != 10 )
    document.calc.cos.disabled = (carry != 10 )
    document.calc.tan.disabled = (carry != 10 )
    document.calc.bt.disabled = (carry != 10 )
    document.calc.pi.disabled = (carry != 10 )
    document.calc.e.disabled = (carry != 10 )
    document.calc.kp.disabled = (carry != 10 )
                
    document.calc.k2.disabled = (carry <= 2 )
    document.calc.k3.disabled = (carry <= 2 )
    document.calc.k4.disabled = (carry <= 2 )
    document.calc.k5.disabled = (carry <= 2 )
    document.calc.k6.disabled = (carry <= 2 )
    document.calc.k7.disabled = (carry <= 2 )
    document.calc.k8.disabled = (carry <= 8 )
    document.calc.k9.disabled = (carry <= 8 )
    document.calc.ka.disabled = (carry <= 10 )
    document.calc.kb.disabled = (carry <= 10 )
    document.calc.kc.disabled = (carry <= 10 )
    document.calc.kd.disabled = (carry <= 10 )
    document.calc.ke.disabled = (carry <= 10 )
    document.calc.kf.disabled = (carry <= 10 )

    
    
}

function  inputChangAngle(angletype)
{
    endNumber = true
    angle = angletype
     if  (angle == " d " )
        document.calc.display.value = radiansToDegress(document.calc.display.value)
     else
        document.calc.display.value = degressToRadians(document.calc.display.value)
    endNumber = true
}

function  inputshift()
{
     if  (document.calc.shiftf.checked)
     {
        document.calc.bt.value = " deg  "
        document.calc.ln.value = " exp  "
        document.calc.log.value = " expd "
        
         if  (document.calc.hypf.checked)
         {
            document.calc.sin.value = " ahs  "
            document.calc.cos.value = " ahc  "
            document.calc.tan.value = " aht  "
        }
         else
         {
            document.calc.sin.value = " asin "
            document.calc.cos.value = " acos "
            document.calc.tan.value = " atan "
        }
        
        document.calc.sqr.value = " x^.5 "
        document.calc.cube.value = " x^.3 "
        
        document.calc.floor.value = " 小数 "
    }
     else
     {
        document.calc.bt.value = " d.ms "
        document.calc.ln.value = "  ln  "
        document.calc.log.value = " log  "

         if  (document.calc.hypf.checked)
         {
            document.calc.sin.value = " hsin "
            document.calc.cos.value = " hcos "
            document.calc.tan.value = " htan "
        }
         else
         {
            document.calc.sin.value = " sin  "
            document.calc.cos.value = " cos  "
            document.calc.tan.value = " tan  "
        }
        
        document.calc.sqr.value = " x^2  "
        document.calc.cube.value = " x^3  "
        
        document.calc.floor.value = " 取整 "
    }

}
// 存储器部分

function  clearmemory()
{
    mem = 0
    document.calc.memory.value = "     "
}

function  getmemory()
{
    endNumber = true
    document.calc.display.value = decto(mem,carry)
}

function  putmemory()
{
    endNumber = true
     if  (document.calc.display.value != 0 )
     {
        mem = todec(document.calc.display.value,carry)
        document.calc.memory.value = "  M  "
    }
     else
        document.calc.memory.value = "     "
}

function  addmemory()
{
    endNumber = true
    mem = parseFloat(mem) + parseFloat(todec(document.calc.display.value,carry))
     if  (mem == 0 )
        document.calc.memory.value = "     "
     else
        document.calc.memory.value = "  M  "
}

function  multimemory()
{
    endNumber = true
    mem = parseFloat(mem) * parseFloat(todec(document.calc.display.value,carry))
     if  (mem == 0 )
        document.calc.memory.value = "     "
     else
        document.calc.memory.value = "  M  "
}

// 十进制转换

function  todec(num,oldcarry)
{
     if  (oldcarry == 10   ||  num == 0 )  return (num)
     var  neg = (num.charAt( 0 ) == " - " )
     if  (neg) num = num.substr( 1 )
     var  newnum = 0
     for  ( var  index = 1 ;index <= num.length;index ++ )
        newnum = newnum * oldcarry + hexnum.indexOf(num.charAt(index - 1 ))
     if  (neg)
        newnum =- newnum
     return (newnum)
}

function  decto(num,newcarry)
{
     var  neg = (num < 0 )
     if  (newcarry == 10   ||  num == 0 )  return (num)
    num = "" + Math.abs(num)
     var  newnum = ""
     while  (num != 0 )
     {
        newnum = hexnum.charAt(num % newcarry) + newnum
        num = Math.floor(num / newcarry)
    }
     if  (neg)
        newnum = " - " + newnum
     return (newnum)
}

// 表达式解析

function  parse(string)
{
     if  (string.match( /^ (. * \d[\ + \ - \ * \ / \ % \ ^ \ & \ | x\ < ]) ? ([ +- ] ? [ 0 - 9a - f\.] + )([\ + \ - \ * \ / \ % \ ^ \ & \ | x\ < ])([ +- ] ? [ 0 - 9a - f\.] + )$ / ))
         return (RegExp.$ 1 + cypher(RegExp.$ 2 ,RegExp.$ 3 ,RegExp.$ 4 ))
     else
         return (string)
}

// 数学运算和位运算

function  cypher(left,join,right)
{
    left = todec(left,carry)
    right = todec(right,carry)
     if  (join == " + " )
         return (decto(parseFloat(left) + parseFloat(right),carry))
     if  (join == " - " )
         return (decto(left - right,carry))
     if  (join == " * " )
         return (decto(left * right,carry))
     if  (join == " / "   &&  right != 0 )
         return (decto(left / right,carry))
     if  (join == " % " )
         return (decto(left % right,carry))
     if  (join == " & " )
         return (decto(left & right,carry))
     if  (join == " | " )
         return (decto(left | right,carry))
     if  (join == " ^ " )
         return (decto(Math.pow(left,right),carry))
     if  (join == " x " )
         return (decto(left ^ right,carry))
     if  (join == " < " )
         return (decto(left << right,carry))
    alert( " 除数不能为零 " )
     return (left)
}

// 函数计算

function  funcalc(fun,num)
{
     with (Math)
     {
         if  (fun == " pi " )
             return (PI)
         if  (fun == " e " )
             return (E)

         if  (fun == " abs " )
             return (abs(num))
         if  (fun == " ceil " )
             return (ceil(num))
         if  (fun == " round " )
             return (round(num))

         if  (fun == " floor " )
             return (floor(num))
         if  (fun == " deci " )
             return (num - floor(num))


         if  (fun == " ln "   &&  num > 0 )
             return (log(num))
         if  (fun == " exp " )
             return (exp(num))
         if  (fun == " log "   &&  num > 0 )
             return (log(num) * LOG10E)
         if  (fun == " expdec " )
             return (pow( 10 ,num))

        
         if  (fun == " cube " )
             return (num * num * num)
         if  (fun == " cubt " )
             return (pow(num, 1 / 3 ))
         if  (fun == " sqr " )
             return (num * num)
         if  (fun == " sqrt "   &&  num >= 0 )
             return (sqrt(num))

         if  (fun == " ! " )
             return (factorial(num))

         if  (fun == " recip "   &&  num != 0 )
             return ( 1 / num)
        
         if  (fun == " dms " )
             return (dms(num))
         if  (fun == " deg " )
             return (deg(num))

         if  (fun == " ~ " )
             return ( ~ num)
    
         if  (angle == " d " )
         {
             if  (fun == " sin " )
                 return (sin(degressToRadians(num)))
             if  (fun == " cos " )
                 return (cos(degressToRadians(num)))
             if  (fun == " tan " )
                 return (tan(degressToRadians(num)))

             if  (fun == " arcsin "   &&  abs(num) <= 1 )
                 return (radiansToDegress(asin(num)))
             if  (fun == " arccos "   &&  abs(num) <= 1 )
                 return (radiansToDegress(acos(num)))
             if  (fun == " arctan " )
                 return (radiansToDegress(atan(num)))
        }
         else
         {
             if  (fun == " sin " )
                 return (sin(num))
             if  (fun == " cos " )
                 return (cos(num))
             if  (fun == " tan " )
                 return (tan(num))

             if  (fun == " arcsin "   &&  abs(num) <= 1 )
                 return (asin(num))
             if  (fun == " arccos "   &&  abs(num) <= 1 )
                 return (acos(num))
             if  (fun == " arctan " )
                 return (atan(num))
        }
    
         if  (fun == " hypsin " )
             return ((exp(num) - exp( 0 - num)) * 0.5 )
         if  (fun == " hypcos " )
             return ((exp(num) + exp( - num)) * 0.5 )
         if  (fun == " hyptan " )
             return ((exp(num) - exp( - num)) / (exp(num) + exp( - num)))

         if  (fun == " ahypsin "   |  fun == " hypcos "   |  fun == " hyptan " )
         {
            alert( " 对不起,公式还没有查到! " )
             return (num)
        }
        
        alert( " 超出函数定义范围 " )
         return (num)
    }
}

function  factorial(n)
{
    n = Math.abs(parseInt(n))
     var  fac = 1
     for  (;n > 0 ;n -= 1 )
        fac *= n
     return (fac)
}

function  dms(n)
{
     var  neg = (n < 0 )
     with (Math)
     {    
        n = abs(n)
         var  d = floor(n)
         var  m = floor( 60 * (n - d))
         var  s = (n - d) * 60 - m
    }
     var  dms = d + m / 100 + s * 0.006
     if  (neg) 
        dms =- dms
     return (dms)
}

function  deg(n)
{
     var  neg = (n < 0 )
     with (Math)
     {
        n = abs(n)
         var  d = floor(n)
         var  m = floor((n - d) * 100 )
         var  s = (n - d) * 100 - m
    }
     var  deg = d + m / 60 + s / 36
     if  (neg) 
        deg =- deg
     return (deg)
}

function  degressToRadians(degress)
{
     return (degress * Math.PI / 180 )
}

function  radiansToDegress(radians)
{
     return (radians * 180 / Math.PI)
}

// 界面

// -->
</ SCRIPT >
<!-- written by GoldHuman li hai --><!-- 2000.8 -->
< META content = " MSHTML 5.50.4134.100 "  name = GENERATOR ></ HEAD >
< BODY leftmargin = " 0 "  topmargin = " 0 " >
< DIV align = center >
< FORM name = calc >
< TABLE height = 250  width = 500  border = 1 >
   < TBODY >
   < TR >
     < TD height = 50 >
       < TABLE width = 500 >
         < TBODY >
         < TR >
               < TD >    </ TD >
           < TD >
             < DIV align = center >< INPUT readOnly size = 40  value = 0  name = display >  
             </ DIV ></ TD ></ TR ></ TBODY ></ TABLE ></ TD ></ TR >
   < TR >
     < TD >
       < TABLE width = 500 >
         < TBODY >
         < TR >
           < TD width = 290 >< INPUT onclick = inputChangCarry( 16 ) type = radio 
            name = carry >  十六进制  < INPUT onclick = inputChangCarry( 10 ) type = radio 
            CHECKED name = carry >  十进制  < INPUT onclick = inputChangCarry( 8 ) type = radio 
            name = carry >  八进制  < INPUT onclick = inputChangCarry( 2 ) type = radio 
            name = carry >  二进制  </ TD >
           < TD ></ TD >
           < TD width = 135 >< INPUT onclick = " inputChangAngle('d') "  type = radio 
            CHECKED value = d name = angle >  角度制  < INPUT 
            onclick = " inputChangAngle('r') "  type = radio value = r name = angle >  弧度制 
         </ TD ></ TR ></ TBODY ></ TABLE >
       < TABLE width = 500 >
         < TBODY >
         < TR >
           < TD width = 170 >< INPUT onclick = inputshift() type = checkbox 
            name = shiftf > 上档功能  < INPUT onclick = inputshift() type = checkbox 
            name = hypf > 双曲函数  </ TD >
           < TD >< INPUT style = " BACKGROUND-COLOR: lightgrey "  readOnly size = 3  
            name = bracket >   < INPUT style = " BACKGROUND-COLOR: lightgrey "  readOnly 
            size = 3  name = memory >   < INPUT style = " BACKGROUND-COLOR: lightgrey "  
            readOnly size = 3  name = operator >   </ TD >
           < TD width = 183 >< INPUT style = " COLOR: red "  onclick = backspace() type = button value = "  退格  " >  
< INPUT style = " COLOR: red "  onclick = " document.calc.display.value = 0  "  type = button value = "  清屏  " >  
< INPUT style = " COLOR: red "  onclick = clearall() type = button value = "  全清 " >  
           </ TD ></ TR ></ TBODY ></ TABLE >
       < TABLE width = 500 >
         < TBODY >
         < TR >
           < TD >
             < TABLE >
               < TBODY >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputfunction('pi','pi') "  type = button value = "  PI  "  name = pi >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputfunction('e','e') "  type = button value = "  E   "  name = e >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('dms','deg') "  type = button value = d.ms name = bt >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = addbracket() type = button value = "  (   " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = disbracket() type = button value = "  )   " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('ln','exp') "  type = button value = "  ln  "  name = ln >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputtrig('sin','arcsin','hypsin','ahypsin') "  type = button value = " sin  "  name = sin >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " operation('^',7) "  type = button value = " x^y  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('log','expdec') "  type = button value = " log  "  name = log >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputtrig('cos','arccos','hypcos','ahypcos') "  type = button value = " cos  "  name = cos >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('cube','cubt') "  type = button value = " x^3  "  name = cube >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('!','!') "  type = button value = "  n!  " >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputtrig('tan','arctan','hyptan','ahyptan') "  type = button value = " tan  "  name = tan >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('sqr','sqrt') "  type = button value = " x^2  "  name = sqr >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: #ff00ff "  onclick = " inputfunction('recip','recip') "  type = button value = " 1/x  " >  
                 </ TD ></ TR ></ TBODY ></ TABLE ></ TD >
           < TD width = 30 ></ TD >
           < TD >
             < TABLE >
               < TBODY >
               < TR >
                 < TD >< INPUT style = " COLOR: red "  onclick = putmemory() type = button value = "  储存  " >  
                 </ TD ></ TR >
               < TR >
                 < TD >< INPUT style = " COLOR: red "  onclick = getmemory() type = button value = "  取存  " >  
                 </ TD ></ TR >
               < TR >
                 < TD >< INPUT style = " COLOR: red "  onclick = addmemory() type = button value = "  累存  " >  
                 </ TD ></ TR >
               < TR >
                 < TD >< INPUT style = " COLOR: red "  onclick = multimemory() type = button value = "  积存  " >  
                 </ TD ></ TR >
               < TR >
                 < TD height = 33 >< INPUT style = " COLOR: red "  onclick = clearmemory() type = button value = "  清存  " >  
                 </ TD ></ TR ></ TBODY ></ TABLE ></ TD >
           < TD width = 30 ></ TD >
           < TD >
             < TABLE >
               < TBODY >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('7') "  type = button value = "  7  "  name = k7 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('8') "  type = button value = "  8  "  name = k8 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('9') "  type = button value = "  9  "  name = k9 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('/',6) "  type = button value = "  /  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('%',6) "  type = button value = 取余 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('&',3) "  type = button value = "  与  " >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('4') "  type = button value = "  4  "  name = k4 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('5') "  type = button value = "  5  "  name = k5 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('6') "  type = button value = "  6  "  name = k6 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('*',6) "  type = button value = "  *  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " inputfunction('floor','deci') "  type = button value = 取整 name = floor >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('|',1) "  type = button value = "  或  " >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('1') "  type = button value = "  1  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('2') "  type = button value = "  2  "  name = k2 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('3') "  type = button value = "  3  "  name = k3 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('-',5) "  type = button value = "  -  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('<',4) "  type = button value = 左移 >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " inputfunction('~','~') "  type = button value = "  非  " >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('0') "  type = button value = "  0  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = changeSign() type = button value =+/->  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  onclick = " inputkey('.') "  type = button value = "  .  "  name = kp >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('+',5) "  type = button value = "  +  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = result() type = button value = "  ＝  " >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: red "  onclick = " operation('x',2) "  type = button value = 异或 >  
                 </ TD ></ TR >
               < TR align = middle >
                 < TD >< INPUT style = " COLOR: blue "  disabled onclick = " inputkey('a') "  type = button value = "  A  "  name = ka >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  disabled onclick = " inputkey('b') "  type = button value = "  B  "  name = kb >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  disabled onclick = " inputkey('c') "  type = button value = "  C  "  name = kc >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  disabled onclick = " inputkey('d') "  type = button value = "  D  "  name = kd >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  disabled onclick = " inputkey('e') "  type = button value = "  E "  name = ke >  
                 </ TD >
                 < TD >< INPUT style = " COLOR: blue "  disabled onclick = " inputkey('f') "  type = button value = "  F "  name = kf >  
                 </ TD ></ TR ></ TBODY ></ TABLE ></ TD ></ TR ></ TBODY ></ TABLE ></ TD ></ TR ></ TBODY ></ TABLE ></ FORM ></ DIV ></ BODY ></ HTML >