求用js编写一个简单的计算器 求用js编写一个简单的计算器,我都不懂怎么声明变量还有调用那些按钮,比如加减乘除,还有,那个文本框怎么接收那些按钮上的1、2、3等数字 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 <html><body> <form name=Keypad action=""> <table border=1 > <tr> <td align=middle colSpan=4><input class=text_input size=30 value=0 name=ReadOut width="100%"> </td> <td width=0></td> <td width=50><input class=Button onclick=Clear() type=button value=" C " name=btnClear> </td> <td><input class=Button onclick=ClearEntry() type=button value=" CE " name=btnClearEntry2> </td></tr> <tr> <td width=50><input class=Button onclick=NumPressed(7) type=button value=" 7 " name=btnSeven> </td> <td width=50><input class=Button onclick=NumPressed(8) type=button value=" 8 " name=btnEight> </td> <td width=50><input class=Button onclick=NumPressed(9) type=button value=" 9 " name=btnNine> </td> <td width=50><input class=Button onclick=hexchange() type=button value=HEX name=btnHex> </td> <td width=0></td> <td width=50><input class=Button onclick=Neg() type=button value=" +/- " name=btnNeg> </td> <td><input class=Button onclick=Percent() type=button value=" % " name=btnPercent> </td></tr> <tr> <td width=50><input class=Button onclick=NumPressed(4) type=button value=" 4 " name=btnFour> </td> <td width=50><input class=Button onclick=NumPressed(5) type=button value=" 5 " name=btnFive> </td> <td width=50><input class=Button onclick=NumPressed(6) type=button value=" 6 " name=btnSix> </td> <td width=50><input class=Button onclick=octchange() type=button value=OCT name=btnClearEntry222> </td> <td width=0></td> <td align=middle width=50><input class=Button onClick="Operation('+')" type=button value=" + " name=btnPlus> </td> <td align=middle> <P align=center><input class=Button onClick="Operation('-')" type=button value=" - " name=btnMinus> </P></td></tr> <tr> <td width=50><input class=Button onclick=NumPressed(1) type=button value=" 1 " name=btnOne> </td> <td width=50><input class=Button onclick=NumPressed(2) type=button value=" 2 " name=btnTwo> </td> <td width=50><input class=Button onclick=NumPressed(3) type=button value=" 3 " name=btnThree> </td> <td width=50><input class=Button onclick=binchange() type=button value=BIN name=btnClearEntry223> </td> <td width=0></td> <td align=middle width=50><input class=Button onClick="Operation('*')" type=button value=" * " name=btnMultiply> </td> <td align=middle><input class=Button onClick="Operation('/')" type=button value=" / " name=btnDivide> </td></tr> <tr> <td width=50><input class=Button onclick=NumPressed(0) type=button value=" 0 " name=btnZero> </td> <td width=50><input class=Button onclick=Decimal() type=button value=" . " name=btnDecimal> </td> <td colSpan=5><input class=Button onClick="Operation('=')" type=button value=" = " name=btnEquals> </td></tr></table></form></body> <SCRIPT language=JavaScript>var FKeyPad = document.Keypad;var Accum = 0;var FlagNewNum = false;var PendingOp = "";function NumPressed (Num) {if (FlagNewNum) {FKeyPad.ReadOut.value = Num;FlagNewNum = false;}else {if (FKeyPad.ReadOut.value == "0")FKeyPad.ReadOut.value = Num;elseFKeyPad.ReadOut.value += Num;}}function Operation (Op) {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);elseAccum = 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 () {FKeyPad.ReadOut.value = "0";FlagNewNum = true;}function Clear () {Accum = 0;PendingOp = "";ClearEntry();}function Neg () {FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;}function Percent () {FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accum);}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);}</SCRIPT></html> 紧急求助-关于struts2的convention插件 native2ascii 问题 JBuilder下Tomcat配置 jsp怎样读取客户机的磁盘信息 SVG中的鹰眼视图(左上角)如何实现 如果把这一段代码改成是从数据库里谈数据的呢?---------在线等待 请问,如何将javax.ejb.EJBObject,javax.ejb.SessionBean引入,需要哪个jar包? jquery 的uploadify上传 linux 下环境配置问题,高手请指点,在线等,急用!! applet是否可以访问本地的数字证书? 求助 tomcat5.5无法启动
<body>
<form name=Keypad action="">
<table border=1 >
<tr>
<td align=middle colSpan=4><input class=text_input size=30 value=0
name=ReadOut width="100%"> </td>
<td width=0></td>
<td width=50><input class=Button onclick=Clear() type=button value=" C " name=btnClear>
</td>
<td><input class=Button onclick=ClearEntry() type=button value=" CE " name=btnClearEntry2>
</td></tr>
<tr>
<td width=50><input class=Button onclick=NumPressed(7) type=button value=" 7 " name=btnSeven>
</td>
<td width=50><input class=Button onclick=NumPressed(8) type=button value=" 8 " name=btnEight>
</td>
<td width=50><input class=Button onclick=NumPressed(9) type=button value=" 9 " name=btnNine>
</td>
<td width=50><input class=Button onclick=hexchange() type=button value=HEX name=btnHex>
</td>
<td width=0></td>
<td width=50><input class=Button onclick=Neg() type=button value=" +/- " name=btnNeg>
</td>
<td><input class=Button onclick=Percent() type=button value=" % " name=btnPercent>
</td></tr>
<tr>
<td width=50><input class=Button onclick=NumPressed(4) type=button value=" 4 " name=btnFour>
</td>
<td width=50><input class=Button onclick=NumPressed(5) type=button value=" 5 " name=btnFive>
</td>
<td width=50><input class=Button onclick=NumPressed(6) type=button value=" 6 " name=btnSix>
</td>
<td width=50><input class=Button onclick=octchange() type=button value=OCT name=btnClearEntry222>
</td>
<td width=0></td>
<td align=middle width=50><input class=Button onClick="Operation('+')" type=button value=" + " name=btnPlus>
</td>
<td align=middle>
<P align=center><input class=Button onClick="Operation('-')" type=button value=" - " name=btnMinus>
</P></td></tr>
<tr>
<td width=50><input class=Button onclick=NumPressed(1) type=button value=" 1 " name=btnOne>
</td>
<td width=50><input class=Button onclick=NumPressed(2) type=button value=" 2 " name=btnTwo>
</td>
<td width=50><input class=Button onclick=NumPressed(3) type=button value=" 3 " name=btnThree>
</td>
<td width=50><input class=Button onclick=binchange() type=button value=BIN name=btnClearEntry223>
</td>
<td width=0></td>
<td align=middle width=50><input class=Button onClick="Operation('*')" type=button value=" * " name=btnMultiply>
</td>
<td align=middle><input class=Button onClick="Operation('/')" type=button value=" / " name=btnDivide>
</td></tr>
<tr>
<td width=50><input class=Button onclick=NumPressed(0) type=button value=" 0 " name=btnZero>
</td>
<td width=50><input class=Button onclick=Decimal() type=button value=" . " name=btnDecimal>
</td>
<td colSpan=5><input class=Button onClick="Operation('=')" type=button value=" = " name=btnEquals>
</td></tr></table></form></body>
<SCRIPT language=JavaScript>
var FKeyPad = document.Keypad;
var Accum = 0;
var FlagNewNum = false;
var PendingOp = "";
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 )
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 () {
FKeyPad.ReadOut.value = "0";
FlagNewNum = true;
}
function Clear () {
Accum = 0;
PendingOp = "";
ClearEntry();
}
function Neg () {
FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;
}
function Percent () {
FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accum);
}
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);
}</SCRIPT>
</html>