网页计数器

<html> 
<head> 
<title>计算器</title> 
</head> 
<body bgcolor="#33FF99" onload="FKeyPad.ReadOut.focus();FKeyPad.ReadOut.select();"> 
<FORM name="Keypad" action=""> 
<TABLE align="center"> 
<B> 
<TABLE align="center" border=3 width=60 height=80 cellpadding=2 cellspacing=5 borderlight="#008080"> 
<tr align="center"> 
<td bordercolor="#FF33CC" bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933" colspan=10 align=center>网页计算器</td> 
</tr> 
<tr align="center"> 
<td bordercolor="#FF33CC" bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933" colspan=10 align=right><input name="ReadOut" type="Text" onkeypress="CheckOut()" size=40 value="0" 
width=100%></td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnsin" type="Button" value=" sin " onclick="useFun ('sin')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btncos" type="Button" value=" cos " onclick="useFun ('cos')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnOne" type="Button" value=" 1 " onclick="NumPressed(1)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnTwo" type="Button" value=" 2 " onclick="NumPressed(2)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnThree" type="Button" value=" 3 " onclick="NumPressed(3)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnPlus" type="Button" value=" + " onclick="Operation('+')"> </td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnasin" type="Button" value=" asin " onclick="useFun ('asin')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnacos" type="Button" value=" acos " onclick="useFun ('acos')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnFour" type="Button" value=" 4 " onclick="NumPressed(4)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnFive" type="Button" value=" 5 " onclick="NumPressed(5)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnSix" type="Button" value=" 6 " onclick="NumPressed(6)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnMinus" type="Button" value=" - " onclick="Operation('-')"></td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btntan" type="Button" value=" tan " onclick="useFun ('tan')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnatan" type="Button" value=" atan " onclick="useFun ('atan')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnSeven" type="Button" value=" 7 " onclick="NumPressed(7)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnEight" type="Button" value=" 8 " onclick="NumPressed(8)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnNine" type="Button" value=" 9 " onclick="NumPressed(9)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnMultiply" type="Button" value=" * " onclick="Operation('*')"></td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnlog" type="Button" value=" log " onclick="useFun ('log')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnexp" type="Button" value=" exp " onclick="useFun ('exp')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnZero" type="Button" value=" 0 " onclick="NumPressed(0)"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDecimal" type="Button" value=" . " onclick="Decimal()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnNeg" type="Button" value=" +/- " onclick="Neg()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" / " onclick="Operation('/')"></td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnsqrt" type="Button" value=" sqrt " onclick="useFun ('sqrt')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnOx" type="Button" value=" 1/x " onclick="useFun ('1/x')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnXt" type="Button" value=" x^2 " onclick="useFun ('x^2')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnXthr" type="Button" value=" x^3 " onclick="useFun ('x^3')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnpi" type="Button" value=" pi " onclick=FKeyPad.ReadOut.value=Math.PI></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnEquals" type="Button" value=" = " onclick="Operation('=')"></td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" N! " onclick="ni ()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" pow " onclick="Operation('pow')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" E " onclick=FKeyPad.ReadOut.value=Math.E></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnClear" type="Button" value=" C " onclick="Clear()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnClearEntry" type="Button" value=" CE " onclick="ClearEntry()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnReturn" type="Button" value="返 回" onclick="goReturn()"></td> 
</tr> 
<tr align="center"> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" MOD " onclick="Operation('MOD')"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnDivide" type="Button" value=" INT" onclick=FKeyPad.ReadOut.value=parseInt(FKeyPad.ReadOut.value,10)></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" HEX " onclick="hexchange ()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" OCT " onclick="octchange ()"></td> 
<td bordercolordark="#cc0066" bordercolor="#FF9966" bordercolorlight="#CC9933"><input name="btnmod" type="Button" value=" BIN " onclick="binchange ()"></td> 
</tr> 
</TABLE> 
</TABLE> 
</B> 
</FORM> 
</CENTER> 
<font face="Verdana, Arial, Helvetica" size=2> 
<SCRIPT LANGUAGE="JavaScript"> 
<!-- Begin 
var FKeyPad = document.forms['Keypad']; 
var Accum = "0"; 
var FlagNewNum = false; 
var PendingOp = ""; 
function longCount(str1,str2,type) 
{ 
var comma1 = 0; 
if (str1.indexOf(".")!=-1) 
{ 
str1 = str1.replace(/0*$/,""); 
comma1 = str1.length - str1.indexOf(".")-1; 
} 
var comma2 = 0; 
if (str2.indexOf(".")!=-1) 
{ 
str2 = str2.replace(/0*$/,""); 
comma2 = str2.length - str2.indexOf(".")-1; 
} 
str1 = str1.replace(//./,""); 
str2 = str2.replace(//./,""); 
var value,comma; 
if (type!="*") 
{ 
if (comma1>comma2) 
{ 
for (var i=0;i<comma1-comma2;i++) str2 += "0"; 
comma = (type=="/")?0:comma1; 
}else 
{ 
for (var i=0;i<comma2-comma1;i++) str1 += "0"; 
comma = (type=="/")?0:comma2; 
} 
}else 
{ 
comma = comma1 + comma2; 
} 
if (type=="+") 
{ 
value = parseInt(str1,10) + parseInt(str2,10); 
}else if (type=="-") 
{ 
value = parseInt(str1,10) - parseInt(str2,10); 
}else if (type=="*") 
{ 
value = parseInt(str1,10) * parseInt(str2,10); 
}else if (type=="/") 
{ 
value = parseInt(str1,10) / parseInt(str2,10); 
} 
else if (type=="MOD") 
value = parseInt(str1,10) % parseInt(str2,10); 
else if (type=="pow") 
{ 
var a,b,s=1; 
a=parseInt(str1,10); 
b=parseInt(str2,10); 
for(var i=1;i<=b;i++) 
s=s*a; 
value=parseInt(s,10); 
} 
value = String(value); 
if (comma>0) value = value.substring(0,value.length-comma)+"."+value.substring(value.length- comma,value.length); 
if (value.indexOf(".")!=-1) 
value = value.replace(/0*$/,""); 
return value; 
} 
function NumPressed (Num) { 
if (FlagNewNum) 
{ 
FKeyPad.ReadOut.value = Num; 
FlagNewNum = false; 
} 
else 
{ 
if (FKeyPad.ReadOut.value == "0") 
FKeyPad.ReadOut.value = Num; 
else 
FKeyPad.ReadOut.value += Num; 
} 
} 
function Operation (Op) 
{ 
var Readout = FKeyPad.ReadOut.value; 
if (FlagNewNum && PendingOp != "="); 
else 
{ 
FlagNewNum = true; 
if ( '+' == PendingOp || '-' == PendingOp || '/' == PendingOp || '*' == PendingOp||'MOD'==PendingOp||'pow'==PendingOp) 
Accum = longCount(Accum,Readout,PendingOp); 
else 
Accum = Readout; 
FKeyPad.ReadOut.value = Accum; 
PendingOp = Op; 
FKeyPad.ReadOut.focus(); 
FKeyPad.ReadOut.select(); 
} 
} 
function useFun (st) 
{ 
switch(st) 
{ 
case "sin": 
FKeyPad.ReadOut.value=Math.sin(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "cos": 
FKeyPad.ReadOut.value=Math.cos(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "asin": 
FKeyPad.ReadOut.value=Math.asin(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "acos": 
FKeyPad.ReadOut.value=Math.acos(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "tan": 
FKeyPad.ReadOut.value=Math.tan(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "atan": 
FKeyPad.ReadOut.value=Math.atan(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "log": 
FKeyPad.ReadOut.value=Math.log(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "exp": 
FKeyPad.ReadOut.value=Math.exp(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "sqrt": 
FKeyPad.ReadOut.value=Math.sqrt(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "1/x": 
FKeyPad.ReadOut.value=1/FKeyPad.ReadOut.value; 
FlagNewNum=true; 
break; 
case "x^2": 
FKeyPad.ReadOut.value=parseFloat(FKeyPad.ReadOut.value)*parseFloat(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break; 
case "x^3": 
FKeyPad.ReadOut.value=parseFloat(FKeyPad.ReadOut.value)*parseFloat(FKeyPad.ReadOut.value)*parseFloat(FKeyPad.ReadOut.value); 
FlagNewNum=true; 
break;

}

} 
function hexchange () 
{ 
var hex,dec; 
dec = parseFloat(FKeyPad.ReadOut.value); 
hex = dec.toString(16); 
window.alert("该十进制数转成十六进制数为："+ hex); 
} 
function octchange () 
{ 
var oct,dec; 
dec = parseFloat(FKeyPad.ReadOut.value); 
oct = dec.toString(8); 
window.alert("该十进制数转成八进制数为："+ oct); 
} 
function binchange () 
{ 
var bin,dec; 
dec = parseFloat(FKeyPad.ReadOut.value); 
bin = dec.toString(2); 
window.alert("该十进制数转成二进制数为："+ bin); 
} 
function ni () 
{var y,k=1; 
y=parseFloat(FKeyPad.ReadOut.value); 
for(var x=1;x<=y;x++) 
k=k*x; 
FKeyPad.ReadOut.value=k; 
} 
function Decimal () 
{ 
var curReadOut = FKeyPad.ReadOut.value; 
if (FlagNewNum) 
{ 
curReadOut = "0."; 
FlagNewNum = false; 
} 
else 
{ 
if (curReadOut.indexOf(".") == -1) 
curReadOut += "."; 
} 
FKeyPad.ReadOut.value = curReadOut; 
} 
function ClearEntry () 
{ 
FKeyPad.ReadOut.value = "0"; 
FlagNewNum = true; 
} 
function Clear () 
{ 
Accum = "0"; 
PendingOp = ""; 
ClearEntry(); 
} 
function Neg () 
{ 
window.alert(FKeyPad.ReadOut.value); 
FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,"-1","*"); 
}