JavaScript计算器源码

发布时间:2019年06月20日 阅读:94 次

JavaScript计算器源码

 

 

 JavaScript计算器源码

 

<FORM name="Keypad" action="">

<TABLE>

<B>

<TABLE border=2 width=50 height=60 cellpadding=1 cellspacing=5>

<TR>

<TD colspan=3>

<input name="ReadOut" type="Text" size=24 value="0" width=100%>

</TD>

<TD>

</TD>

<TD>

<input name="btnClear" type="Button" value="  C  " onclick="Clear()">

</TD>

<TD><input name="btnClearEntry" type="Button" value="  CE " onclick="ClearEntry()">

</TD>

</TR>

<TR>

<TD>

<input name="btnSeven" type="Button" value="  7  " onclick="NumPressed(7)">

</TD>

<TD>

<input name="btnEight" type="Button" value="  8  " onclick="NumPressed(8)">

</TD>

<TD>

<input name="btnNine" type="Button" value="  9  " onclick="NumPressed(9)">

</TD>

<TD>

</TD>

<TD>

<input name="btnNeg" type="Button" value=" +/- " onclick="Neg()">

</TD>

<TD>

<input name="btnPercent" type="Button" value="  % " onclick="Percent()">

</TD>

</TR>

<TR>

<TD>

<input name="btnFour" type="Button" value="  4  " onclick="NumPressed(4)">

</TD>

<TD>

<input name="btnFive" type="Button" value="  5  " onclick="NumPressed(5)">

</TD>

<TD>

<input name="btnSix" type="Button" value="  6  " onclick="NumPressed(6)">

</TD>

<TD>

</TD>

<TD><input name="btnPlus" type="Button" value="  +  " onclick="Operation('+')">

</TD>

<TD><input name="btnMinus" type="Button" value="   -   " onclick="Operation('-')">

</TD>

</TR>

<TR>

<TD>

<input name="btnOne" type="Button" value="  1  " onclick="NumPressed(1)">

</TD>

<TD>

<input name="btnTwo" type="Button" value="  2  " onclick="NumPressed(2)">

</TD>

<TD>

<input name="btnThree" type="Button" value="  3  " onclick="NumPressed(3)">

</TD>

<TD>

</TD>

<TD><input name="btnMultiply" type="Button" value="  *  " onclick="Operation('*')">

</TD>

<TD><input name="btnDivide" type="Button" value="   /   " onclick="Operation('/')">

</TD>

</TR>

<TR>

<TD>

<input name="btnZero" type="Button" value="  0  " onclick="NumPressed(0)">

</TD>

<TD>

<input name="btnDecimal" type="Button" value="   .  " onclick="Decimal()">

</TD>

<TD colspan=3>

</TD>

<TD>

<input name="btnEquals" type="Button" value="  =  " onclick="Operation('=')">

</TD>

</TR>

</TABLE>

</TABLE>

</B>

</FORM>

</CENTER>

<SCRIPT LANGUAGE="JavaScript">

<!-- Begin

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);

}

// End -->

</SCRIPT>

以上就是JavaScript计算器源码的内容,希望这篇文章对您有所帮助!如有什么疑惑欢迎到我们的js网站进行留言!

 http://www.javascriptedu.com


Tag:JavaScript计算器源码 怎么用javascript做计算器
相关文章

发表评论: