求一个计算器的JS代码

<HTML>
<HEAD><TITLE></TITLE><style type="text/css">
p {font-size: 12pt}
.red {color: red;width:34}
.redl{color:red;width:51}
.blue {color: blue;width:34}
</style><SCRIPT LANGUAGE="JavaScript">var Memory = 0;
var Number1 = "";
var Number2 = "";
var NewNumber = "blank";
var opvalue = "";function Display(displaynumber) {
document.calculator.answer.value = displaynumber;
}function MemoryClear() {
Memory = 0;
document.calculator.mem.value = "";
}function MemoryRecall(answer) {
if(NewNumber != "blank") {
Number2 += answer;
} else {
Number1 = answer;
}
NewNumber = "blank";
Display(answer);
}function MemorySubtract(answer) {
Memory = Memory - eval(answer);
}function MemoryAdd(answer) {
Memory = Memory + eval(answer);
document.calculator.mem.value = " M ";
NewNumber = "blank";
}function ClearCalc() {
Number1 = "";
Number2 = "";
NewNumber = "blank";
Display("");
}function Backspace(answer) {
answerlength = answer.length;
answer = answer.substring(0, answerlength - 1);
if (Number2 != "") {
Number2 = answer.toString();
Display(Number2);
} else {
Number1 = answer.toString();
Display(Number1);
}
}function CECalc() {
Number2 = "";
NewNumber = "yes";
Display("");
}function CheckNumber(answer) {
if(answer == ".") {
Number = document.calculator.answer.value;
if(Number.indexOf(".") != -1) {
answer = "";
}
}
if(NewNumber == "yes") {
Number2 += answer;
Display(Number2);
}
else {
if(NewNumber == "blank") {
Number1 = answer;
Number2 = "";
NewNumber = "no";
}
else {
Number1 += answer;
}
Display(Number1);
}
}
function AddButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) + parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '+';
Display(Number1);
}
function SubButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) - parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '-';
Display(Number1);
}
function MultButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) * parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '*';
Display(Number1);
}
function DivButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) / parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '/';
Display(Number1);
}
function SqrtButton() {
Number1 = Math.sqrt(Number1);
NewNumber = "blank";
Display(Number1);
}
function PercentButton() {
if(NewNumber != "blank") {
Number2 *= .01;
NewNumber = "blank";
Display(Number2);
}
}
function RecipButton() {
Number1 = 1/Number1;
NewNumber = "blank";
Display(Number1);
}
function NegateButton() {
Number1 = parseFloat(-Number1);
NewNumber = "no";
Display(Number1);
}
function EqualButton() {
if(opvalue == '+') AddButton(0);
if(opvalue == '-') SubButton(0);
if(opvalue == '*') MultButton(0);
if(opvalue == '/') DivButton(0);
Number2 = "";
opvalue = "";
}</script>
</HEAD><BODY>
<center>
<form name="calculator">
<table bgcolor="#aaaaaa" width=230>
<tr><td>
<table bgcolor="#cccccc" border=1>
<tr><td>
<table border=0 cellpadding=0>
<tr><td bgcolor="#000080"></td></tr>
<tr><td>
<table width="100%" border=0>
<tr><td colspan=6><input type="text" readOnly name="answer" size=30 maxlength=30 onChange="CheckNumber(this.value)"></td></tr>
<tr><td colspan=6>
<table border=0 cellpadding=0>
<tr><td>
<input type="text" name="mem" size=3 maxlength=3 readOnly style="background:menu"> <input type="button" name="backspace" class="redl" value="退格" onClick="Backspace(document.calculator.answer.value); return false;"> <input type="button" name="CE" class="redl" value="CE" onClick="CECalc(); return false;"> <input type="reset" name="C" class="redl" value="C" onClick="ClearCalc(); return false;">
</td></tr>
</table>
</td></tr>
<tr><td><input type="button" name="MC" class="red" value=" MC " onClick="MemoryClear(); return false;"></td>
<td><input type="button" name="calc7" class="blue" value=" 7 " onClick="CheckNumber('7'); return false;"></td>
<td><input type="button" name="calc8" class="blue" value=" 8 " onClick="CheckNumber('8'); return false;"></td>
<td><input type="button" name="calc9" class="blue" value=" 9 " onClick="CheckNumber('9'); return false;"></td>
<td><input type="button" name="divide" class="red" value=" / " onClick="DivButton(1); return false;"></td>
<td><input type="button" name="sqrt" class="blue" value="sqrt" onClick="SqrtButton(); return false;"></td></tr>
<tr><td><input type="button" name="MR" class="red" value=" MR " onClick="MemoryRecall(Memory); return false;"></td>
<td><input type="button" name="calc4" class="blue" value=" 4 " onClick="CheckNumber('4'); return false;"></td>
<td><input type="button" name="calc5" class="blue" value=" 5 " onClick="CheckNumber('5'); return false;"></td>
<td><input type="button" name="calc6" class="blue" value=" 6 " onClick="CheckNumber('6'); return false;"></td>
<td><input type="button" name="multiply" class="red" value=" * " onClick="MultButton(1); return false;"></td>
<td><input type="button" name="percent" class="blue" value=" % " onClick="PercentButton(); return false;"></td></tr>
<tr><td><input type="button" name="MS" class="red" value=" MS " onClick="MemorySubtract(document.calculator.answer.value); return false;"></td>
<td><input type="button" name="calc1" class="blue" value=" 1 " onClick="CheckNumber('1'); return false;"></td>
<td><input type="button" name="calc2" class="blue" value=" 2 " onClick="CheckNumber('2'); return false;"></td>
<td><input type="button" name="calc3" class="blue" value=" 3 " onClick="CheckNumber('3'); return false;"></td>
<td><input type="button" name="minus" class="red" value=" - " onClick="SubButton(1); return false;"></td>
<td><input type="button" name="recip" class="blue" value="1/x " onClick="RecipButton(); return false;"></td></tr>
<tr><td><input type="button" name="Mplus" class="red" value=" M+ " onClick="MemoryAdd(document.calculator.answer.value); return false;"></td>
<td><input type="button" name="calc0" class="blue" value=" 0 " onClick="CheckNumber('0'); return false;"></td>
<td><input type="button" name="negate" class="blue" value="+/- " onClick="NegateButton(); return false;"></td>
<td><input type="button" name="dot" class="blue" value=" . " onClick="CheckNumber('.'); return false;"></td>
<td><input type="button" name="plus" class="red" value=" + " onClick="AddButton(1); return false;"></td>
<td><input type="button" name="equal" class="red" value=" = " onClick="EqualButton(); return false;"></td>
</tr>
</table>
</td></tr>
</table>
</td></tr>
</table>
</td></tr>
</table>
</form>
</center>
<script language=javascript>
function keyDown()
{
var iCode=window.event.keyCode;
//alert(iCode);if(event.shiftKey)
{
switch(iCode)
{
case 56:document.all.multiply.click();break;
case 59:document.all.minus.click();break;
case 60:document.all.plus.click();break;
}
}
if(!event.shiftKey&&!event.ctrlKey&&!event.altKey)
{
switch (iCode)
{
case 8:document.all.backspace.click();break;
case 187:document.all.equal.click();break;case 96:document.all.calc0.click();break;
case 97:document.all.calc1.click();break;
case 98:document.all.calc2.click();break;
case 99:document.all.calc3.click();break;
case 100:document.all.calc4.click();break;
case 101:document.all.calc5.click();break;
case 102:document.all.calc6.click();break;
case 103:document.all.calc7.click();break;
case 104:document.all.calc8.click();break;
case 105:document.all.calc9.click();break;
case 110:document.all.dot.click();break;
case 13:document.all.equal.click();break;
case 107:document.all.plus.click();break;
case 109:document.all.minus.click();break;
case 106:document.all.multiply.click();break;
case 111:document.all.divide.click();break;case 48:document.all.calc0.click();break;
case 49:document.all.calc1.click();break;
case 50:document.all.calc2.click();break;
case 51:document.all.calc3.click();break;
case 52:document.all.calc4.click();break;
case 53:document.all.calc5.click();break;
case 54:document.all.calc6.click();break;
case 55:document.all.calc7.click();break;
case 56:document.all.calc8.click();break;
case 57:document.all.calc9.click();break;
case 190:document.all.dot.click();break;
case 13:document.all.equal.click();break;
case 191:document.all.divide.click();break;
}
}//event.keyCode=0;
//event.returnValue=false;
}
window.document.attachEvent("onkeydown",keyDown)
</script></BODY>
</HTML>

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求一个计算器的JS代码

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