js计算器

主要是，想训练一直面向对象的思想···请各位，贴出计算器的源代码，大家研究下，是怎样去实现的，是怎么样的一种思路

解决方案 »

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML><HEAD><TITLE>科学计算器</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<STYLE type=text/css>TD {
FONT-SIZE: 13px
}
BODY {
FONT-SIZE: 13px
}
BODY {
MARGIN-TOP: 0px; MARGIN-LEFT: 0px; MARGIN-RIGHT: 0px; BACKGROUND-COLOR: #fcfff7
}
</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
接着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><META content="MSHTML 6.00.2900.3314" name=GENERATOR></HEAD>
<BODY bgColor=#fcfff7 leftMargin=0 topMargin=0 marginwidth="0"><BR>
<DIV align=center>
<FORM name=calc>
<TABLE
style="BORDER-RIGHT: #8ab78a 1px solid; BORDER-TOP: #8ab78a 1px solid; BORDER-LEFT: #8ab78a 1px solid; BORDER-BOTTOM: #8ab78a 1px solid"
height=250 width=650 bgColor=#e6f2e7>
  <TBODY>
  <TR>
    <TD bgColor=#e6f2e7 height=50>
      <TABLE width="100%">
        <TBODY>
        <TR>
          <TD align=middle> </TD>
        </TR>
        <TR>
          <TD align=middle height=35><INPUT style="FONT-SIZE: 18px" readOnly
            size=50 value=0 name=display></TD></TR></TBODY></TABLE></TD></TR>
  <TR>
    <TD bgColor=#e6f2e7>
      <TABLE
      style="BORDER-RIGHT: #8ab78a 0px solid; BORDER-TOP: #8ab78a 1px solid; BORDER-LEFT: #8ab78a 0px solid; BORDER-BOTTOM: #8ab78a 0px solid"
      width="100%">
        <TBODY>
        <TR>
          <TD style="COLOR: #205001"><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 style="COLOR: #205001" width=187><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="100%">
        <TBODY>
        <TR>
js 计算器的话只要用eval就省很多事了
我的qq 297034596 就是qq邮箱把