📄 calculator.jsp
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<%@ page contentType="text/html; charset=GB2312" %>
<%@ page language="java" %>
<html>
<head>
<title>计算器</title>
</head>
<BODY>
<center>
<font size=5 color=blue>计算器</font>
</center>
<br>
<hr>
<br>
<CENTER>
<FORM name="Keypad" action="">
<TABLE bgcolor=#add8e6>
<B>
<TABLE border=2 width=324 height=155 cellpadding=1 cellspacing=2 bgcolor=#00ced1>
<TR>
<TD colspan=3 align=middle width="182" height="25"><input class=buttonstyle name="ReadOut" type="Text" size=24 value="0" width=100%>
<TD width="16" height="25">
<TD width="66" height="25"><input class=buttonstyle name="btnClear" type="Button" value=" C " onclick="Clear()">
<TD width="91" height="25"><input class=buttonstyle name="btnClearEntry" type="Button" value=" CE " onclick="ClearEntry()">
</TR>
<TR>
<TD width="54" height="25"><input class=buttonstyle name="btnSeven" type="Button" value=" 7 " onclick="NumPressed(7)">
<TD width="54" height="25"><input class=buttonstyle name="btnEight" type="Button" value=" 8 " onclick="NumPressed(8)">
<TD width="54" height="25"><input class=buttonstyle name="btnNine" type="Button" value=" 9 " onclick="NumPressed(9)">
<TD width="16" height="25">
<TD width="66" height="25"><input class=buttonstyle name="btnNeg" type="Button" value=" +/- " onclick="Neg()">
<TD width="91" height="25"><input class=buttonstyle name="btnPercent" type="Button" value=" % " onclick="Percent()">
</TR>
<TR>
<TD width="54" height="25"><input class=buttonstyle name="btnFour" type="Button" value=" 4 " onclick="NumPressed(4)">
<TD width="54" height="25"><input class=buttonstyle name="btnFive" type="Button" value=" 5 " onclick="NumPressed(5)">
<TD width="54" height="25"><input class=buttonstyle name="btnSix" type="Button" value=" 6 " onclick="NumPressed(6)">
<TD width="16" height="25">
<TD align=middle width="66" height="25"><input class=buttonstyle name="btnPlus" type="Button" value=" + " onclick="Operation('+')">
<TD align=middle width="91" height="25"><input class=buttonstyle name="btnMinus" type="Button" value=" - " onclick="Operation('-')">
</TR>
<TR>
<TD width="54" height="25"><input class=buttonstyle name="btnOne" type="Button" value=" 1 " onclick="NumPressed(1)">
<TD width="54" height="25"><input class=buttonstyle name="btnTwo" type="Button" value=" 2 " onclick="NumPressed(2)">
<TD width="54" height="25"><input class=buttonstyle name="btnThree" type="Button" value=" 3 " onclick="NumPressed(3)">
<TD width="16" height="25">
<TD align=middle width="66" height="25"><input class=buttonstyle name="btnMultiply" type="Button" value=" * " onclick="Operation('*')">
<TD align=middle width="91" height="25"><input class=buttonstyle name="btnDivide" type="Button" value=" / " onclick="Operation('/')">
</TR>
<TR>
<TD width="54" height="5"><input class=buttonstyle name="btnZero" type="Button" value=" 0 " onclick="NumPressed(0)">
<TD width="54" height="5"><input class=buttonstyle name="btnDecimal" type="Button" value=" . " onclick="Decimal()">
<TD colspan=3 width="132" height="5">
<TD width="91" height="5">
<B>
<input class=buttonstyle name="btnEquals" type="Button" value=" = " onclick="Operation('=')">
</B>
</TR>
</TABLE>
</TABLE>
</B>
</FORM>
</CENTER>
<SCRIPT LANGUAGE="JavaScript">
var FKeyPad = document.Keypad;
var Accum = 0;
var FlagNewNum = false;
var PendingOp = "";
function NumPressed (Num) //向计算器的显示屏中输出数字
{
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) //加减乘除远算
{
var Readout = FKeyPad.ReadOut.value;
if (FlagNewNum && PendingOp != "=");
else
{
FlagNewNum = true;
if ( '+' == PendingOp )
Accum += parseFloat(Readout);
else if ( '-' == PendingOp )
Accum -= parseFloat(Readout);
else if ( '/' == PendingOp )
Accum /= parseFloat(Readout);
else if ( '*' == PendingOp )
Accum *= parseFloat(Readout);
else
Accum = parseFloat(Readout);
FKeyPad.ReadOut.value = Accum;
PendingOp = Op;
}
}
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 () //修改输入错误
{
FKeyPad.ReadOut.value = "0";
FlagNewNum = true;
}
function Clear () //清除计算器中的当前运算
{
Accum = 0;
PendingOp = "";
ClearEntry();
}
function Neg () //取反
{
FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;
}
function Percent () //
{
FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accum);
}
</SCRIPT>
</body>
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