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■ 語法主題：圖示計算機

■ 控制碼內容：
■ 下載所須的圖示檔案，放置同目錄底下
將下面複製至 <body> 標籤後

<div align="center"> 
  <center> 
  <table border="0" cellpadding="0" cellspacing="0"> 
    <tr> 
      <td align="center" align="top"><script> 
var NDIGITS = 16; 
var STACKSIZE = 12; 
var value = 0;  
var memory =  
Gookie("CalcMemory"); 
if (!memory) memory = 0; 
var level = 0;  
var entered = true;  
var decimal = 0; 
var fixed = 0;  
var exponent = false;  
var inverse = false;  
function stackItem(){ 
this.value = 0; 
this.op = ""; 
} 
function array(length){ 
this[0] = 0; 
for (i = 0; i < length; i++) { 
this[i] = 0; 
this[i] = new stackItem(); 
} 
this.length = length; 
} 
stack = new array(STACKSIZE); 
function push(value, op, prec){ 
if (level == STACKSIZE) 
return false; 
stack[level].value = value; 
stack[level].op = op; 
stack[level].prec = prec; 
level++; 
return true; 
} 
function pop(){ 
if (level == 0) 
return false; 
level--; 
return true; 
} 
function format(value){ 
var valStr = "" + value; 
if (valStr.indexOf("N") >= 0 || 
(value == 2*value && value == 1+value)) 
return "Error "; 
var i = valStr.indexOf("e") 
if (i >= 0) { 
var expStr = valStr.substring(i+1, valStr.length); 
if (i > 11) i = 11; 
valStr = valStr.substring(0, i); 
if (valStr.indexOf(".") < 0) valStr += "."; 
valStr += " " + expStr; 
} 
else { 
var valNeg = false; 
if (value < 0) { 
value = -value; 
valNeg = true; 
} 
var valInt = Math.floor(value); 
var valFrac = value - valInt; 
var prec = NDIGITS - (""+valInt).length - 1; 
if (! entered && fixed>0) 
prec = fixed; 
var mult = " 1000000000000000000".substring(1, prec+2); 
var frac = Math.floor(valFrac * mult + 0.5); 
valInt = Math.floor(Math.floor(value * mult + .5) / mult); 
if (valNeg) 
valStr = "-" + valInt; 
else 
valStr = "" + valInt; 
var fracStr = "00000000000000" + frac; 
fracStr = fracStr.substring(fracStr.length-prec, fracStr.length); 
i = fracStr.length - 1; 
if (entered || fixed==0) { 
while (i >= 0 && fracStr.charAt(i) == "0") 
--i; 
fracStr = fracStr.substring(0, i+1); 
} 
if (i >= 0) valStr += "." + fracStr; 
} 
return valStr; 
} 
function refresh(){ 
var display = format(value); 
if (exponent) { 
if (expval < 0) 
display += " " + expval; 
else 
display += " +" + expval; 
} 
if (display.indexOf(".") < 0 && display != "Error ") { 
if (entered || decimal > 0) 
display += '.'; 
else 
display += ' '; 
} 
display = " " + display; 
display = display.substring(display.length-NDIGITS-1, display.length); 
document.result.result.value = display; 
inverse = false; 
} 
function clearAll(){ 
level = 0; 
clear(); 
} 
function clear(){ 
exponent = false; 
value = 0; 
enter(); 
refresh(); 
} 
function evalx(){ 
if (level==0) 
return false; 
op = stack[level-1].op; 
sval = stack[level-1].value; 
if (op == "+") 
value = sval + value; 
else if (op == '-') 
value = sval - value; 
else if (op == '*') 
value = sval * value; 
else if (op == '/') 
value = sval / value; 
else if (op == 'pow') 
value = Math.pow(sval, value); 
pop(); 
if (op == '(') 
return false; 
return true; 
} 
function openp(){ 
enter(); 
if (!push(0, '(', 0)) { 
value = "NAN"; 
} 
refresh(); 
} 
function closep(){ 
enter(); 
while (evalx()); 
refresh(); 
} 
function operator(op){ 
enter(); 
if (op == '+' || op == '-') 
prec = 1; 
else if (op == '*' || op == '/') 
prec = 2; 
else if (op == "pow") 
prec = 3; 
if (level > 0 && prec <= stack[level-1].prec) 
evalx(); 
if (!push(value, op, prec)) 
value = "NAN"; 
refresh(); 
} 
function enter(){ 
if (exponent) 
value = value * Math.exp(expval * Math.LN10); 
entered = true; 
exponent = false; 
decimal = 0; 
fixed = 0; 
} 
function equals(){ 
enter(); 
while (level > 0) 
evalx(); 
refresh(); 
} 
function digit(n){ 
if (entered) { 
value = 0; 
digits = 0; 
entered = false; 
} 
if (n == 0 && digits == 0) { 
refresh(); 
return; 
} 
if (exponent) { 
if (expval < 0) 
n = -n; 
if (digits < 3) { 
expval = expval * 10 + n; 
++digits; 
refresh(); 
} 
return; 
} 
if (value < 0) 
n = -n; 
if (digits < NDIGITS-1) { 
++digits; 
if (decimal > 0) { 
decimal = decimal * 10; 
value = value + (n/decimal); 
++fixed; 
} 
else 
value = value * 10 + n; 
} 
refresh(); 
} 
function sign(){ 
if (exponent) 
expval = -expval; 
else 
value = -value; 
refresh(); 
} 
function period(){ 
if (entered) { 
value = 0; 
digits = 1; 
} 
entered = false; 
if (decimal == 0) { 
decimal = 1; 
} 
refresh(); 
} 
function exp(){ 
if (entered || exponent) 
return; 
exponent = true; 
expval = 0; 
digits = 0; 
decimal = 0; 
refresh(); 
} 
function inv(){ 
inverse = !inverse; 
} 
function func(f){ 
enter(); 
if (f == "1/x") 
value = 1/value; 
else if (f == "swap") { 
if (level == 0) 
value = "NAN"; 
else { 
var tmp = value; 
value = stack[level-1].value; 
stack[level-1].value = tmp; 
} 
} 
else if (f == 'n!') { 
if (value < 0 || value > 200 || 
value != Math.round(value)) 
value = "NAN"; 
else { 
var n = 1; 
var i; 
for (i = 1; i <= value; i++) 
n *= i; 
value = n; 
} 
} 
else if (f == "MR") 
value = memory; 
else if (f == "M+") { 
memory += value; 
Sookie("CalcMemory", memory); 
} 
else if (f == "Min") { 
memory = value; 
Sookie("CalcMemory", memory); 
} 
else if (inverse) { 
if (f == "sin") 
value = Math.asin(value)*180/Math.PI; 
else if (f == "cos") 
value = Math.acos(value)*180/Math.PI; 
else if (f == "tan") 
value = Math.atan(value)*180/Math.PI; 
else if (f == "log") 
value = Math.exp(value * Math.LN10); 
else if (f == "log2") 
value = Math.exp(value * Math.LN2); 
else if (f == "ln") 
value = Math.exp(value); 
else if (f == "sqrt") 
value = value*value; 
else if (f == "pi") 
value = Math.E; 
} 
else { 
if (f == "sin") 
value = Math.sin(value/180 * Math.PI); 
else if (f == "cos") 
value = Math.cos(value/180 * Math.PI); 
else if (f == "tan") 
value = Math.tan(value/180 * Math.PI); 
else if (f == "log") 
value = Math.log(value)/Math.LN10; 
else if (f == "log2") 
value = Math.log(value)/Math.LN2; 
else if (f == "ln") 
value = Math.log(value); 
else if (f == "sqrt") 
value = Math.sqrt(value); 
else if (f == "pi") 
value = Math.PI; 
} 
refresh(); 
} 
function none(){ 
alert("Not implemented here!"); 
} 
function GookieVal(offset) { 
var endstr = document.cookie.indexOf (";", offset); 
if (endstr == -1) 
endstr = document.cookie.length; 
return unescape( 
document.cookie.substring(offset, endstr)); 
} 
function Gookie(name) { 
var arg = name + "="; 
var alen = arg.length; 
var clen = document.cookie.length; 
var i = 0; 
while (i < clen) { 
var j = i + alen; 
if (document.cookie.substring(i, j) == arg) 
return GookieVal (j); 
i = document.cookie.indexOf(" ", i) + 1; 
if (i == 0) break; 
} 
return null; 
} 
function Sookie(name, value) { 
var argv = Sookie.arguments; 
var argc = Sookie.arguments.length; 
var expires = (argc > 2) ? argv[2] : null; 
var path = (argc > 3) ? argv[3] : null; 
var domain = (argc > 4) ? argv[4] : null; 
var secure = (argc > 5) ? argv[5] : false; 
document.cookie = name + "=" + escape (value) + 
((expires == null) ? "" : ("; expires=" 
+ expires.toGMTString())) + 
((path == null) ? "" : ("; path=" + path)) + 
((domain == null) ? "" : ("; domain=" + domain)) + 
((secure == true) ? "; secure" : ""); 
} 
function Dookie(name) { 
var exp = new Date(); 
exp.setTime (exp.getTime() - 1); 
var cval = Gookie (name); 
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString(); 
} 
document.write('<FORM name="result">') 
document.write('<INPUT size=20 name="result" onFocus="refresh(); this.blur();">') 
document.write('</FORM>') 
refresh() 
</script> 
        <p><map name="FPMap0"> 
        <area href="javascript:digit(0)" shape="rect" coords="12, 191, 32, 209"> 
        <area href="javascript:period()" shape="rect" coords="40, 191, 60, 209"> 
        <area href="javascript:exp()" shape="rect" coords="68, 191, 88, 209"> 
        <area href="javascript:sign()" shape="rect" coords="96, 191, 116, 209"> 
        <area href="javascript:equals()" shape="rect" coords="124, 191, 144, 209"> 
        <area href="javascript:digit(1)" shape="rect" coords="12, 166, 32, 184"> 
        <area href="javascript:digit(2)" shape="rect" coords="40, 166, 60, 184"> 
        <area href="javascript:digit(3)" shape="rect" coords="68, 166, 88, 184"> 
        <area href="javascript:operator('+')" shape="rect" coords="96, 166, 116, 184"> 
        <area href="javascript:operator('-')" shape="rect" coords="124, 166, 144, 184"> 
        <area href="javascript:digit(4)" shape="rect" coords="12, 141, 32, 159"> 
        <area href="javascript:digit(5)" shape="rect" coords="40, 141, 60, 159"> 
        <area href="javascript:digit(6)" shape="rect" coords="68, 141, 88, 159"> 
        <area href="javascript:operator('*')" shape="rect" coords="96, 141, 116, 159"> 
        <area href="javascript:operator('/')" shape="rect" coords="124, 141, 144, 159"> 
        <area href="javascript:digit(7)" shape="rect" coords="12, 116, 32, 134"> 
        <area href="javascript:digit(8)" shape="rect" coords="40, 116, 60, 134"> 
        <area href="javascript:digit(9)" shape="rect" coords="68, 116, 88, 134"> 
        <area href="javascript:clear()" shape="rect" coords="96, 116, 116, 134"> 
        <area href="javascript:clearAll()" shape="rect" coords="124, 116, 144, 134"> 
        <area href="javascript:openp()" shape="rect" coords="12, 90, 32, 104"> 
        <area href="javascript:closep()" shape="rect" coords="40, 90, 60, 104"> 
        <area href="javascript:func('Min')" shape="rect" coords="68, 90, 88, 104"> 
        <area href="javascript:func('MR')" shape="rect" coords="96, 90, 116, 104"> 
        <area href="javascript:func('M+')" shape="rect" coords="124, 90, 144, 104"> 
        <area href="javascript:operator('pow')" shape="rect" coords="12, 65, 32, 79"> 
        <area href="javascript:func('n!')" shape="rect" coords="40, 65, 60, 79"> 
        <area href="javascript:func('sqrt')" shape="rect" coords="68, 65, 88, 79"> 
        <area href="javascript:func('1/x')" shape="rect" coords="96, 65, 116, 79"> 
        <area href="javascript:func('swap')" shape="rect" coords="124, 65, 144, 79"> 
        <area href="javascript:inv()" shape="rect" coords="12, 40, 32, 54"> 
        <area href="javascript:func('sin')" shape="rect" coords="40, 40, 60, 54"> 
        <area href="javascript:func('cos')" shape="rect" coords="68, 40, 88, 54"> 
        <area href="javascript:func('tan')" shape="rect" coords="96, 40, 116, 54"> 
        <area href="javascript:func('pi')" shape="rect" coords="124, 40, 144, 54"> 
        <area href="javascript:func('log')" shape="rect" coords="12, 15, 32, 29"> 
        <area href="javascript:func('ln')" shape="rect" coords="40, 15, 60, 29"> 
        <area href="javascript:func('log2')" shape="rect" coords="68, 15, 88, 29"> 
        <area href="javascript:none()" shape="rect" coords="96, 15, 116, 29"> 
        <area href="javascript:none()" shape="rect" coords="124, 15, 144, 29"></map> 
        <img rectangle=" (68,191) (88, 209) javascript:exp()" rectangle=" (96,191) (116, 209) javascript:sign()" rectangle=" (124,191) (144, 209) javascript:equals()" rectangle=" (12,166) (32, 184) javascript:digit(1)" rectangle=" (40,166) (60, 184) javascript:digit(2)" rectangle=" (68,166) (88, 184) javascript:digit(3)" rectangle=" (96,166) (116, 184) javascript:operator('+')" rectangle=" (124,166) (144, 184) javascript:operator('-')" rectangle=" (12,141) (32, 159) javascript:digit(4)" rectangle=" (40,141) (60, 159) javascript:digit(5)" rectangle=" (68,141) (88, 159) javascript:digit(6)" rectangle=" (96,141) (116, 159) javascript:operator('*')" rectangle=" (124,141) (144, 159) javascript:operator('/')" rectangle=" (12,116) (32, 134) javascript:digit(7)" rectangle=" (40,116) (60, 134) javascript:digit(8)" rectangle=" (68,116) (88, 134) javascript:digit(9)" rectangle=" (96,116) (116, 134) javascript:clear()" rectangle=" (124,116) (144, 134) javascript:clearAll()" rectangle=" (12,90) (32, 104) javascript:openp()" rectangle=" (40,90) (60, 104) javascript:closep()" rectangle=" (68,90) (88, 104) javascript:func('Min')" rectangle=" (96,90) (116, 104) javascript:func('MR')" rectangle=" (124,90) (144, 104) javascript:func('M+')" rectangle=" (12,65) (32, 79) javascript:operator('pow')" rectangle=" (40,65) (60, 79) javascript:func('n!')" rectangle=" (68,65) (88, 79) javascript:func('sqrt')" rectangle=" (96,65) (116, 79) javascript:func('1/x')" rectangle=" (124,65) (144, 79) javascript:func('swap')" rectangle=" (12,40) (32, 54) javascript:inv()" rectangle=" (40,40) (60, 54) javascript:func('sin')" rectangle=" (68,40) (88, 54) javascript:func('cos')" rectangle=" (96,40) (116, 54) javascript:func('tan')" rectangle=" (124,40) (144, 54) javascript:func('pi')" rectangle=" (12,15) (32, 29) javascript:func('log')" rectangle=" (40,15) (60, 29) javascript:func('ln')" rectangle=" (68,15) (88, 29) javascript:func('log2')" rectangle=" (96,15) (116, 29) javascript:none()" rectangle=" (124,15) (144, 29) javascript:none()" src="caculator.gif" border="0" usemap="#FPMap0" width="159" height="224"></td> 
    </tr> 
  </table> 
  </center> 
</div>