📄 ch21-295.html
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<HTML>
<HEAD>
<TITLE>综合篇--计算器</TITLE>
</HEAD>
<BODY bgcolor="#fef4d2" onload=StartCal()>
<br><br>
<center>
<h2>综合篇--计算器</h2>
<hr width=300>
<!-- 案例代码1开始 -->
<script language=JavaScript>
var opStack = new Array(4)
opStack[0] = 0
opStack[1] = ''
opStack[2] = ''
opStack[3] = ''
function StartCal(){
document.PAD.SUM.value= "0"
}
function KeyinNum() {
if (opStack[0] >= 2) { opStack[0] = 3 }
else { opStack[0] = 1 }
opStack[opStack[0]] = '' + document.PAD.SUM.value
}
function resetNum () {
opStack[0] = 0
opStack[1] = 0
document.PAD.CAL.value = ''
document.PAD.SUM.value = '0'
}
function calc1 (x) {
var opFlag = opStack[0]
if (opFlag == -1 || opFlag == 1) { count(x) }
else if (opFlag == 3) {
opStack[1] = '' + eval(opStack[1] + opStack[2] + opStack[3])
count(x) }
}
function count (x) {
if (x == 'Si') { opStack[1] = '' + Math.sin (opStack[1]) }
else if (x == 'aS') { opStack[1] = '' + Math.asin(opStack[1]) }
else if (x == 'Co') { opStack[1] = '' + Math.cos (opStack[1]) }
else if (x == 'aC') { opStack[1] = '' + Math.acos(opStack[1]) }
else if (x == 'Ta') { opStack[1] = '' + Math.tan (opStack[1]) }
else if (x == 'aT') { opStack[1] = '' + Math.atan(opStack[1]) }
else if (x == '≡') { opStack[1] = '' + Math.pow (opStack[1],.5) }
else if (x == '^2') { opStack[1] = '' + Math.pow (opStack[1], 2) }
else if (x == '^3') { opStack[1] = '' + Math.pow (opStack[1], 3) }
else if (x == '^4') { opStack[1] = '' + Math.pow (opStack[1], 4) }
else if (x == 'AB') { opStack[1] = '' + Math.abs (opStack[1]) }
else if (x == '∽') { }
document.PAD.CAL.value = ''
opStack[0] = -1
display()
document.PAD.SUM.focus()
document.PAD.SUM.select()
}
function display () {
var sum = parseFloat(opStack[1])
document.PAD.SUM.value = '' + Math.round (sum * Math.pow(10,14)) / Math.pow(10,14)
}
function fra(){
var i
var j = 1
var k = document.PAD.SUM.value
if (k >= 70) {opStack[1] = 0; document.PAD.SUM.value = "---Error---"; return}
for (i = 1; i <= k; i++){j = j * i}
opStack[1] = document.PAD.SUM.value = j
document.PAD.SUM.focus()
document.PAD.SUM.select()
}
function entry (x) {
if (opStack[0] == -1) { opStack[0] = 1; opStack[1] = ''}
if (opStack[0] == 0) { opStack[0] = 1; opStack[1] = ''}
if (opStack[0] == 2) { opStack[0] = 3; opStack[3] = ''}
var result = result = opStack[opStack[0]]
if (result == '0') { result = '' }
if (x>='1' && x<='9') { result = '' + result + x }
else if (x == 'P') { result = '' + Math.PI }
else if (x == '0') { if (result != '') result = '' + result + '0' }
else if (x == 'B') { if (result != '') result = result.substring(0, result.length - 1) }
else if (x == '.') {
if (result != '') { if (result.indexOf(".") == -1) result += "." }
else { result = '0.' } }
if (result =='') result = '0'
opStack[opStack[0]] = result
document.PAD.SUM.value = result
}
function calc2 (x) {
var opFlag = opStack[0]
if (opFlag != 2) {
if (opFlag == 3) {
opStack[1]=''+eval(opStack[1]+opStack[2]+opStack[3])
display() }
opStack[0] = 2
opStack[2] = x
document.PAD.CAL.value = x
document.PAD.SUM.focus()
document.PAD.SUM.select() }
}
function neg() {
if (opStack[0] != 2 && opStack[0] != 0) {
opStack[0] = Math.abs(opStack[0])
var result = opStack[opStack[0]]
if (result != '0' && result != '') {
if (result.charAt(0) == '-') { result = result.substring(1, result.length) }
else { result = '-' + result }
opStack[opStack[0]] = result
document.PAD.SUM.value = result } }
}
function TurnOff(){
var ask = confirm("您确定要关闭计算器么？")
if (ask == true) {window.close()}
else {return}
}
</script>
<!-- 案例代码1结束 -->
<!-- 案例代码2开始 -->
<FORM NAME="PAD">
<TABLE BORDER>
<TR><TD COLSPAN=8>
<INPUT NAME="CAL" TYPE="TEXT" SIZE=1 VALUE="">结果：
<INPUT NAME="SUM" TYPE="TEXT" SIZE=16 VALUE="" onChange="KeyinNum()">
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="重置" onClick="resetNum()">
<TD><INPUT TYPE="BUTTON" VALUE="开方" onClick="calc1('≡')">
<TD><INPUT TYPE="BUTTON" VALUE="平方" onClick="calc1('^2')">
<TD><INPUT TYPE="BUTTON" VALUE="X !" onClick="fra()" >
<TR>
<TD><INPUT TYPE="BUTTON" VALUE=" 7 " onClick="entry('7')">
<TD><INPUT TYPE="BUTTON" VALUE=" 8 " onClick="entry('8')">
<TD><INPUT TYPE="BUTTON" VALUE=" 9 " onClick="entry('9')">
<TD><INPUT TYPE="BUTTON" VALUE=" * " onClick="calc2('*')">
<TR>
<TD><INPUT TYPE="BUTTON" VALUE=" 4 " onClick="entry('4')">
<TD><INPUT TYPE="BUTTON" VALUE=" 5 " onClick="entry('5')">
<TD><INPUT TYPE="BUTTON" VALUE=" 6 " onClick="entry('6')">
<TD><INPUT TYPE="BUTTON" VALUE=" / " onClick="calc2('/')">
<TR>
<TD><INPUT TYPE="BUTTON" VALUE=" 1 " onClick="entry('1')">
<TD><INPUT TYPE="BUTTON" VALUE=" 2 " onClick="entry('2')">
<TD><INPUT TYPE="BUTTON" VALUE=" 3 " onClick="entry('3')">
<TD><INPUT TYPE="BUTTON" VALUE=" - " onClick="calc2('-')">
<TR>
<TD><INPUT TYPE="BUTTON" VALUE=" 0 " onClick="entry('0')">
<TD><INPUT TYPE="BUTTON" VALUE=" . " onClick="entry('.')">
<TD><INPUT TYPE="BUTTON" VALUE="+/-" onClick="neg()" >
<TD><INPUT TYPE="BUTTON" VALUE=" + " onClick="calc2('+')">
<TR>
<TD><INPUT TYPE="BUTTON" VALUE="关闭" onClick="TurnOff()">
<TD><INPUT TYPE="BUTTON" VALUE="后退" onClick="entry('B')">
<TD><INPUT TYPE="BUTTON" VALUE=" Pi "onClick="entry('P')">
<TD><INPUT TYPE="BUTTON" VALUE=" = " onClick="calc1('=')" >
</TABLE>
</FORM>
<!-- 案例代码2结束 -->
</BODY>
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