使用javascript的计算器(单击运算符时任何人都可以帮助获得第一个值和第二个值而不会消失第一个值) [英] calculator using javascript(any one can help to get first value and second value without disappearing the 1st value when clicking the operators)
本文介绍了使用javascript的计算器(单击运算符时任何人都可以帮助获得第一个值和第二个值而不会消失第一个值)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
table
{
border-radius:15px;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Calculator</title>
<script type="text/javascript">
window.onload=function()
{
document.calculator.result.focus();
}
var total;
var opr = 0;
function display(val)
{
document.calculator.result.value+= val;
}
function txtclear()
{
document.calculator.result.value='';
}
function operator(opval)
{
opr = opval;
total = document.calculator.result.value;
}
function equals()
{
CValue = eval(document.calculator.result.value)
PValue = eval(total)
if(opr =="+")
{
answer = PValue + CValue;
}
else if(opr =="*")
{
answer = PValue * CValue;
}
else if(opr =="-")
{
answer = PValue - CValue;
}
else if(opr =="/")
{
answer = PValue / CValue;
}
document.calculator.result.value = answer;
}
function box(e)
{
var unicode=e.charCode? e.charCode : e.keyCode
if (unicode!=8 && unicode!=9 && unicode!=13)
{
if (unicode<42 || unicode>57)
return false;
}
if(unicode==13)
{
equals();
return false;
}
if(unicode==43)
{
operator("+");
return false;
}
if(unicode==45)
{
operator("-");
return false;
}
if(unicode==42)
{
operator("*");
return false;
}
if(unicode==47)
{
operator("/");
return false;
}document.calculator.result.value='';
}
</script>
</head>
<body bgcolor="#3CACA9">
<form name="calculator">
<table width="248" height="309" border="3" bordercolor="#0099FF" align="center" style="margin-removed100px">
<tr>
<td height="29" colspan="5" style="background-color:#09C;">
<div style="color:#C09; font-weight:bolder; font-size:15px; " align="left">Calculator
</div>
</td>
</tr>
<tr>
<td height="56" colspan="5" style=" background-color:#09C;">
<input type="text" name="result" style="height:100%; width:98.5%; text-align: right; font-family:Lucida Grande; font-size:45px;" onkeypress="return box(event)" />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="one" value="1" onclick="display('1')" onmouseup="hello()" />
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="two" value="2" onclick="display('2')" onmouseup="hello()" />
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="three" value="3" onclick="display('3')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="add" value="+" onclick=operator("+") />
</td>
<td width="43" rowspan="4" align="center">
<input type="button" style="height:225px; width:100%; font-weight:bold" name="evaluate" value="=" onclick=equals() />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="four" value="4" onclick="display('4')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="five" value="5" onclick="display('5')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="six" value="6" onclick="display('6')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="subtract" value="-" onclick=operator("-") />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="seven" value="7" onclick="display('7')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="eight" value="8" onclick="display('8')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="nine" value="9" onclick="display('9')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="multiply" value="*" onclick=operator("*") />
</td>
</tr>
<tr>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="dot" value="." onclick="display('.')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="zero" value="0" onclick="display('0')"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="clear" value="C" onclick="txtclear()"/>
</td>
<td width="43" height="52" align="center">
<input type="button" style="height:100%; width:100%; font-weight:bold" name="divide" value="/" onclick=operator("/") />
</td>
</tr>
</table>
</form>
</body>
</html>推荐答案
Check this out:
http://javascriptsource.com/math-related/advanced.html[^]
Check this out:
http://javascriptsource.com/math-related/advanced.html[^]
Do you call it a calculator?
This is a calculator: http://sakryukov.org/freeware/calculator/[^].
—SA
Do you call it a calculator?
This is a calculator: http://sakryukov.org/freeware/calculator/[^].
—SA
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