关于java计算器

<html><head><scriptlanguage="javescript">functioncompute(op){varnum1,num2;num1=parseF... <html>
<head>
<script language="javescript">
function compute(op)
{
var num1,num2;
num1=parseFloat(document.myform.num1.value);
num2=parseFloat(document.myform.num2.value);
if(op=="+")
document.myform.result.value=num1+num2;
if(op=="-")
document.myform.result.value=num1-num2;
if(op=="*")
document.myform.result.value=num1*num2;
if(op=="/"&&num2!=0)
document.myform.result.value=num1/num2;
}
</script>
</head>
<body>
<form action="" method="post" name="myform" id="myform">
<p>第一个数
<input name="num1" type="text" id="num1" size=="25">
<br>
第二个数
<input name="num2" type="text" id="num2" size="25">
</p>
<p>
<input name="addButton" type="button" id="addbutton" value="+" onClick="compute('+')">
<input name="subButton" type="button" id="subbutton" value="-" onClick="compute('-')">
<input name="mulButton" type="button" id="mulbutton" value="*" onClick="compute('*')">
<input name="divButton" type="button" id="divbutton" value="/" onClick="compute('/')">
</p>
<p>计算结果
<input name="result" type="text" id="result" size="25">
</p>
</form>
</body>
</html>
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2个回答

#合辑# 面试问优缺点怎么回答最加分？

柒染天晴v
2008-02-17 · TA获得超过1484个赞

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<html> 
<head> 
<title>计算器</title> 
</head> 
<body bgcolor="#ffffff" onload="FKeyPad.ReadOut.focus();FKeyPad.ReadOut.select();"> 
<FORM name="Keypad" action=""> 
<TABLE align="center"> 
<B> 
<TABLE align="center" border=2 width=50 height=60 cellpadding=1 cellspacing=5> 
<TR> 
<TD colspan=3 align=middle><input name="ReadOut" type="Text" onkeypress="CheckOut()" 

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

</TD> 
<TD align=middle><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 align=middle><input name="btnMultiply" type="Button" value=" * " onclick="Operation

('*')"></TD> 
<TD align=middle><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=2></TD> 
<TD><input name="btnEquals" type="Button" value=" = " onclick="Operation('=')"></TD> 
<TD><input name="btnReturn" type="Button" value="返 回" onclick="goReturn()"></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 = ""; 
//=============================================================================== 
//[描述] 浮点数精确计算 
//[参数] str1 - 第一个数 
// str2 - 第二个数 
// type - 运算符 
// precision - 小数位精度 
//[调用方式] longCount(str1,str2,type,precision); 
//[返回值] 计算结果 
//=============================================================================== 
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); 
} 
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) 
Accum = longCount(Accum,Readout,PendingOp); 
else 
Accum = Readout; 
FKeyPad.ReadOut.value = Accum; 
PendingOp = Op; 
FKeyPad.ReadOut.focus(); 
FKeyPad.ReadOut.select(); 
} 
} 
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 () { 
alert(FKeyPad.ReadOut.value); 
FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,"-1","*"); 
} 
function Percent () { 
FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,Accum,"*"); 
FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,100,"/"); 
} 
function goReturn() { 
top.returnValue = FKeyPad.ReadOut.value; 
self.close(); 
} 
function CheckOut() { 
var keyCode = window.event.keyCode; 
if (keyCode>=48 && keyCode<=57) { 
if (FlagNewNum) { 
FKeyPad.ReadOut.value = ""; 
//window.event.keyCode = null; 
FlagNewNum = false; 
} 
return true; 
}else if (keyCode==43 || keyCode==45 || keyCode==42 || keyCode==47 || keyCode==61) { 
Operation(String.fromCharCode(keyCode)); 
}else if (keyCode==46) {//. 
if (FKeyPad.ReadOut.value.indexOf(".") == -1) 
return true; 
}else if (keyCode==13) goReturn(); 
window.event.returnValue = false; 
return false; 
} 
// End --> 
</SCRIPT> 
</body> 
</html>


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百度网友ace86825f
2008-02-17

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回答量：40

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这个是JS脚本额~

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