JavaScript实现的计算器
2018-07-20 来源：open-open
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript计算器</title>
<style type="text/css">
input {
background-color: #CCC;
width: 70px;
height: 40px;
}
table {
background-color: #999;
border: 3px solid #666;
padding: 3px;
}
.result {
width: 420px;
background-color: #999;
margin-bottom: 10px;
font-family: "微软雅黑", Verdana, sans-serif, "宋体";
font-size: 14px;
color: #FFF;
padding-left: 20px;
}
.clear {
width: 146px;
}
</style>
</head>
<script language="JavaScript">
var baseoper;
var digitstate;
var num1;
var operstate;
function setStartState() {
digitstate = "beempty";
num1 = 0;
baseoper = "beempty";
operstate = false;
}
function add(i) {
if (operstate) {
cal.total.value = i;
operstate = false;
} else {
if (cal.total.value == "0") {
cal.total.value = i;
digistate = "bein";
} else
cal.total.value += i;
}
}
function cleartext() {
cal.total.value = "0";
digitstate = "beempty";
basestate = "beempty"
}
function count() {
if (baseoper != "beempty") {
switch (baseoper) {
case "+":
num1 = parseFloat(num1) + parseFloat(cal.total.value);
break;
case "-":
num1 = parseFloat(num1) - parseFloat(cal.total.value);
break;
case "*":
num1 = parseFloat(num1) * parseFloat(cal.total.value);
break;
case "/":
num1 = parseFloat(num1) / parseFloat(cal.total.value);
break;
}
preoper = true;
cal.total.value = num1;
}
baseoper = "beempty";
}
function useFunc(func) {
switch (func) {
case "sin":
cal.total.value = Math.sin(cal.total.value);
break;
case "cos":
cal.total.value = Math.cos(cal.total.value);
break;
case "asin":
cal.total.value = Math.asin(cal.total.value);
break;
case "acos":
cal.total.value = Math.acos(cal.total.value);
break;
case "tan":
cal.total.value = Math.tan(cal.total.value);
break;
case "atan":
cal.total.value = Math.atan(cal.total.value);
break;
case "log":
cal.total.value = Math.log(cal.total.value);
break;
case "exp":
cal.total.value = Math.exp(cal.total.value);
break;
case "sqrt":
cal.total.value = Math.sqrt(cal.total.value);
break;
case "1/x":
cal.total.value = 1 / cal.total.value;
break;
}
operstate = true;
}
function addPoint() {
if (digitstate == "bein" || digitstate == "beempty") {
cal.total.value += ".";
digistate = "befloat";
}
}
function setOper(oper) {
operstate = true;
if (baseoper == "beempty") {
num1 = 0 + cal.total.value;
baseoper = oper;
} else {
count();
baseoper = oper;
}
}
</script>
<body onload="setStartState()">
<h2>JavaScript计算器</h2>
<form name="cal">
<table cellpadding="0" cellspacing="0">
<tr align="center">
<td colspan="6"><input class="result" type="Text" name="total"
size="25" value="0"></td>
</tr>
<tr align="center">
<td><input type="Button" value="sin" onclick="useFunc('sin')"></td>
<td><input type="Button" value="cos" onclick="useFunc('cos')"></td>
<td><input type="Button" value="1" onclick="add('1')"></td>
<td><input type="Button" value="2" onclick="add('2')"></td>
<td><input type="Button" value="3" onclick="add('3')"></td>
<td><input type="Button" value="+" onclick="setOper('+')"></td>
</tr>
<tr align="center">
<td><input type="Button" value="asin" onclick="useFunc('asin')"></td>
<td><input type="Button" value="acos" onclick="useFunc('acos')"></td>
<td><input type="Button" value="4" onclick="add('4')"></td>
<td><input type="Button" value="5" onclick="add('5')"></td>
<td><input type="Button" value="6" onclick="add('6')"></td>
<td><input type="Button" value="-" onclick="setOper('-')"></td>
</tr>
<tr align="center">
<td><input type="Button" value="tan" onclick="useFunc('tan')"></td>
<td><input type="Button" value="atan" onclick="useFunc('atan')"></td>
<td><input type="Button" value="7" onclick="add('7')"></td>
<td><input type="Button" value="8" onclick="add('8')"></td>
<td><input type="Button" value="9" onclick="add('9')"></td>
<td><input type="Button" value="x" onclick="setOper('*')"></td>
</tr>
<tr align="center">
<td><input type="Button" value="log" onclick="useFunc('log')"></td>
<td><input type="Button" value="exp" onclick="useFunc('exp')"></td>
<td><input type="Button" value="0" onclick="add('0')"></td>
<td><input type="Button" value="." onclick="addPoint()"></td>
<td><input type="Button" value="c" onclick="cleartext()"></td>
<td><input type="Button" value="÷" onclick="setOper('/')"></td>
</tr>
<tr align="center">
<td><input type="Button" value="sqrt" onclick="useFunc('sqrt')">
<td><input type="Button" value="1/x" onclick="useFunc('1/x')">
<td><input type="Button" value="pi"
onclick="cal.total.value=Math.PI"></td>
<td><input type="Button" value="E"
onclick="cal.total.value=Math.E"></td>
<td colspan=2><input class="clear" type="Button" value="="
onclick="count()"></td>
</tr>
</table>
</form>
</body>
</html>
标签： seo
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