JavaScript编写的简易计算器

相关主题

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

</td>
<td>
<input type="button" style="width:40px" value="9" onclick="addNum('9')">
</td>
<td>
<input type="button" style="width:40px" value="*" onclick="setOper('*')">
</td>
<td>
<input type="button" style="width:40px" value="7" onclick="addNum('7')">
</td>
<td>
<input type="button" style="width:40px" value="8" onclick="addNum('8')">
{
cal.total.value+=".";
curState="beFloat";//将当前状态设置为float
}
}
function cleartext()//清空计算结果文本框内容
{
cal.total.value="0";
curState="beStart";
curOper="start";
}
function count()//基本的加减乘除运算
preOper=true;
break;
case "asin":
cal.total.value=Math.asin(cal.total.value);
preOper=true;
break;
case "acos":
cal.total.value=Math.acos(cal.total.value);
preOper=true;
</td>
</tr>
<tr align="center">
<td>
<input type="button" style="width:40px" value="tan" onclick="useFunc('tan')">
</td>
<td>
<input type="button" style="width:40px" value="atan" onclick="useFunc('atan')">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<script language="javascript">
var curState;
</td>
<td width="52">
<input type="button" style="width:40px" value="1" onclick="addNum(1)">
</td>
<td width="41">
<input type="button" style="width:40px" value="2" onclick="addNum('2')">
</td>
<td>
<input type="button" style="width:40px" value="=" onclick="count()">
</td>
<td>
<input type="button" style="width:40px" value="/" onclick="setOper('/')">
</td>
</tr>
<tr align="center">
<td>
<input type="button" style="width:40px" value="asin" onclick="useFunc('asin')">
</td>
<td>
<input type="button" style="width:40px" value="acos" onclick="useFunc('acos')">
case "*":
num1=parseFloat(num1)*parseFloat(cal.total.value);break;
case "/":
num1=parseFloat(num1)/parseFloat(cal.total.value);break;
}
cal.total.value=num1;
{
if(curOper!="start")
{
switch(curOper)//根据curOper的值确定运算法则
{
case "+":
num1=parseFloat(num1)+parseFloat(cal.total.value);break;
case "-":
num1=parseFloat(num1)-parseFloat(cal.total.value);break;
preOper=true;
}
preOper="start";
}
function setOper(oper)//当点击“+-*、”时，设置当前的运算法则
{
//alert(curOper);
preOper=true;//为布尔型，表示再次之前是否刚刚单击过双边运算法符
if(curOper=="start")
case "log":
cal.total.value=Math.log(cal.total.value);
preOper=true;
break;
case "exp":
cal.total.value=Math.exp(cal.total.value);
preOper=true;
break;
case "sqrt":
{
//alert(curOper);
num1=0+cal.total.value;/*将第一个值用num1保存，采用‘0+’把total.value字符串转化为数值型，类似于使用parsefloat（）0方法*/
curOper=oper;
//alert(num1);
}
else
{
count();
curOper=oper;
</td>
</tr>
<tr align="center">
<td>
<input type="button" style="width:40px" value="sin" onclick="useFunc('sin')"/>
</td>
<td>
<input type="button" style="width:40px" value="cos" onclick="useFunc('cos')"/>
</td>
<td>
<input type="button" style="width:40px" value="6" onclick="addNum('6')">
</td>
<td>
<input type="button" style="width:40px" value="-" onclick="setOper('-')">
</td>
<td>
<input type="button" style="width:40px" value="0" onclick="addNum('0')">
</td>
<td>
<input type="button" style="width:40px" value="." onclick="addNum('.')">
</td>
<td>
<input type="button" style="width:40px" value="pi" onclick="cal.totoal.value=Math.PI">
</td>
<td>
<input type="button" style="width:40px" value="E" onclick="cal.total.value=Math.E">
</td>
<td width="41">
<input type="button" style="width:40px" value="3" onclick="addNum('3')">
Байду номын сангаас</td>
<td width="40">
<input type="button" style="width:40px" value="+" onclick="setOper('+')">
</td>
<td>
<input type="button" style="width:40px" value="4" onclick="addNum('4')">
</td>
<td>
<input type="button" style="width:40px" value="5" onclick="addNum('5')">
cal.total.value=Math.sqrt(cal.total.value);
preOper=true;
break;
case "1/x":
cal.total.value=1/cal.total.value;
preOper=true;
break;
}
}
</script>
<body onload="setStartState()">
preOper=false;
}
else
{
if(cal.total.value=="0")
{
cal.total.value=i;
curState="beInteger";
}
else
cal.total.value+=i;
}
}
function addPoint()
{
if(curState=="beStart"||curState=="beInteger")
</td>
</tr>
<tr align="center">
<td>
<input type="button" style="width:40px" value="sqrt" onclick="useFunc('sqrt')">
</td>
<td>
<input type="button" style="width:40px" value="1/x" onclick="useFunc('1/x')">
<font size=6>JavaScript计算器</font>
<form name="cal">

<table border="2" align="left">
<tr align="center">
<td colspan="6">
<input type="text" name="total" size="40" value="0">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
var curOper;
num1;
var preOper;
function setStartState()
{
curState="beStart";
num1=0;
curOper="start";
preOper=false;
}
function addNum(i)
{
if(preOper==true)
{
cal.total.value=i;
</td>
</tr>
<tr align="center">
<td>
<input type="button" style="width:40px" value="log" onclick="useFunc('log')">
</td>
<td>
<input type="button" style="width:40px" value="exp" onclick="useFunc('exp')">
}
//alert(curOper);
}
function useFunc(func)
{
switch(func)
{
case "sin":
cal.total.value=Math.sin(cal.total.value);
preOper=true;
break;
case "cos":
cal.total.value=Math.cos(cal.total.value);
break;
case "tan":
cal.total.value=Math.tan(cal.total.value);
preOper=true;
break;
case "atan":
cal.total.value=Math.atan(cal.total.value);
preOper=true;
break;