una "pequeña" recopilacion que hice hace un tiempo para otro foro......
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<HTML>
<HEAD>
<!-- Código descargado gratuitamente de Elite Pirata, website de piratas.
http://www.elitepirata.com -->
<TITLE>Ejemplos Javascript: ejemplo práctico </TITLE>
<script language=javascript>
//<!--
// Javascript scientific calculator (4 March 1996)
// (C) Copyright Rolf Howarth 1996
// rolf@insect.demon.co.uk
var NDIGITS = 16;
var STACKSIZE = 12;
var value = 0; // current value in display
var memory = GetCookie("CalcMemory"); // current value in memory
if (!memory) memory = 0;
var level = 0; // no. of items on stack
var entered = true; // has value on display been 'entered'?
var decimal = 0; // multiplier when entering after decimal point
var fixed = 0; // force trailing zero display when entering decimals
var exponent = false; // currently entering exponent?
var inverse = false; // has the INV key been pressed?
if (location.search)
{
// pass in value through command line
value = location.search.substring(1,location.search.length);
}
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;
for (i=level;i>0; --i)
{
stack[i].value = stack[i-1].value;
stack[i].op = stack[i-1].op;
stack[i].prec = stack[i-1].prec;
}
stack[0].value = value;
stack[0].op = op;
stack[0].prec = prec;
++level;
return true;
}
function pop()
{
if (level==0)
return false;
for (i=0;i<level; ++i)
{
stack[i].value = stack[i+1].value;
stack[i].op = stack[i+1].op;
stack[i].prec = stack[i+1].prec;
}
--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; // max 11 digits
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; // how many digits available after period
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)
{
// remove trailing zeros unless fixed during entry.
while (i>=0 && fracStr.charAt(i)=="0")
--i;
fracStr = fracStr.substring(0,i+1);
}
if (i>=0) valStr += "." + fracStr;
// document.result.debugField.value = "prec "+prec+", mult "+mult+", frac "+frac;
}
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[0].op;
sval = stack[0].value;
// alert("eval "+sval+op+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[0].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")
{
var tmp = value;
value = stack[0].value;
stack[0].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;
SetCookie("CalcMemory", memory);
}
else if (f=="Min")
{
memory = value;
SetCookie("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 hex()
{
location = "js-hcalc.htm?"+value;
}
/////////////
//
// Cookie Functions - Second Helping (21-Jan-96)
// Written by: Bill Dortch, hIdaho Design <bdortch@netw.com>
// The following functions are released to the public domain.
//
function getCookieVal (offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie (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 getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
// Function to create or update a cookie.
// name - String object object containing the cookie name.
// value - String object containing the cookie value. May contain
// any valid string characters.
// [expires] - Date object containing the expiration data of the cookie. If
// omitted or null, expires the cookie at the end of the current session.
// [path] - String object indicating the path for which the cookie is valid.
// If omitted or null, uses the path of the calling document.
// [domain] - String object indicating the domain for which the cookie is
// valid. If omitted or null, uses the domain of the calling document.
// [secure] - Boolean (true/false) value indicating whether cookie transmission
// requires a secure channel (HTTPS).
//
function SetCookie (name, value) {
var argv = SetCookie.arguments;
var argc = SetCookie.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 DeleteCookie (name) {
var exp = new Date();
exp.setTime (exp.getTime() - 1); // This cookie is history
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}
//
// End of cookie functions
//////////
// -->
</script>
</HEAD>
<BODY bgcolor="white" onLoad="refresh()">
<center>
<FORM name=result>
<INPUT size=18 name=result onFocus="refresh(); this.blur();">
</FORM>
<IMG SRC="scalc.gif" width=159 height=224 usemap="#map" border=0>
<MAP name="map">
<AREA SHAPE=rect HREF="javascript:digit(0)" COORDS="12,191,32,209">
<AREA SHAPE=rect HREF="javascript:period()" COORDS="40,191,60,209">
<AREA SHAPE=rect HREF="javascript:exp()" COORDS="68,191,88,209">
<AREA SHAPE=rect HREF="javascript:sign()" COORDS="96,191,116,209">
<AREA SHAPE=rect HREF="javascript:equals()" COORDS="124,191,144,209">
<AREA SHAPE=rect HREF="javascript:digit(1)" COORDS="12,166,32,184">
<AREA SHAPE=rect HREF="javascript:digit(2)" COORDS="40,166,60,184">
<AREA SHAPE=rect HREF="javascript:digit(3)" COORDS="68,166,88,184">
<AREA SHAPE=rect HREF="javascript:operator('+')" COORDS="96,166,116,184">
<AREA SHAPE=rect HREF="javascript:operator('-')" COORDS="124,166,144,184">
<AREA SHAPE=rect HREF="javascript:digit(4)" COORDS="12,141,32,159">
<AREA SHAPE=rect HREF="javascript:digit(5)" COORDS="40,141,60,159">
<AREA SHAPE=rect HREF="javascript:digit(6)" COORDS="68,141,88,159">
<AREA SHAPE=rect HREF="javascript:operator('*')" COORDS="96,141,116,159">
<AREA SHAPE=rect HREF="javascript:operator('/')" COORDS="124,141,144,159">
<AREA SHAPE=rect HREF="javascript:digit(7)" COORDS="12,116,32,134">
<AREA SHAPE=rect HREF="javascript:digit(8)" COORDS="40,116,60,134">
<AREA SHAPE=rect HREF="javascript:digit(9)" COORDS="68,116,88,134">
<AREA SHAPE=rect HREF="javascript:clear()" COORDS="96,116,116,134">
<AREA SHAPE=rect HREF="javascript:clearAll()" COORDS="124,116,144,134">
<AREA SHAPE=rect HREF="javascript:openp()" COORDS="12,90,32,104">
<AREA SHAPE=rect HREF="javascript:closep()" COORDS="40,90,60,104">
<AREA SHAPE=rect HREF="javascript:func('Min')" COORDS="68,90,88,104">
<AREA SHAPE=rect HREF="javascript:func('MR')" COORDS="96,90,116,104">
<AREA SHAPE=rect HREF="javascript:func('M+')" COORDS="124,90,144,104">
<AREA SHAPE=rect HREF="javascript:operator('pow')" COORDS="12,65,32,79">
<AREA SHAPE=rect HREF="javascript:func('n!')" COORDS="40,65,60,79">
<AREA SHAPE=rect HREF="javascript:func('sqrt')" COORDS="68,65,88,79">
<AREA SHAPE=rect HREF="javascript:func('1/x')" COORDS="96,65,116,79">
<AREA SHAPE=rect HREF="javascript:func('swap')" COORDS="124,65,144,79">
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<AREA SHAPE=rect HREF="javascript:func('pi')" COORDS="124,40,144,54">
<AREA SHAPE=rect HREF="javascript:func('log')" COORDS="12,15,32,29">
<AREA SHAPE=rect HREF="javascript:func('ln')" COORDS="40,15,60,29">
<AREA SHAPE=rect HREF="javascript:func('log2')" COORDS="68,15,88,29">
<AREA SHAPE=rect HREF="javascript:hex()" COORDS="96,15,116,29">
<AREA SHAPE=rect HREF="js-info.htm" COORDS="124,15,144,29">
</MAP>
</body>
</html>
<!-- w w w . h t m l p o i n t . c o m -->
<!-- w w w . h t m l p o i n t . c o m -->
<HTML>
<HEAD>
<!-- Código descargado gratuitamente de HTMLpoint, el sitio italiano del web publishing
http://www.htmlpoint.com -->
<TITLE>Ejemplos Javascript: ejemplo práctico </TITLE>
<SCRIPT>
<!-- Activate Cloaking Device
//******************************************************
//
// Freak Out - Displaying C Drive
//
// by Tim Wallace (timothy@essex1.com)
//
//*******************************************************
// Called by View Source button - displays text file of source.
function viewSource()
{
alert("\nA text file with source will be loaded to the full window.\n\nUse your browser BACK button to return to the examples.");
top.window.location="js-freak.txt";
}
// Deactivate Cloaking -->
</SCRIPT>
</HEAD>
<BODY bgcolor="white">
<CENTER><FORM>
<INPUT TYPE="button" Value=" Visualiza C|/ " onClick="window.open('file:///C|/', 'display', 'scrollbars=1')">
</FORM></CENTER>
</body>
</html>
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<HTML>
<HEAD>
<!-- Código descargado gratuitamente de HTMLpoint, el sitio italiano del web publishing
http://www.htmlpoint.com -->
<TITLE>Ejemplos Javascript: ejemplo práctico </TITLE>
</HEAD>
<BODY bgcolor="white">
<CENTER><SCRIPT><!-- Begining of applet -------------------
function random_link(x)
{n=window.prompt(" ¿Cómo te llamas?:","");
document.write("<font size=5>Hola"+n+" visita también mi portada</font>");
}
random_link(0);
// -- End of JavaScript code -------------- --></SCRIPT></CENTER>
</body>
</html>
<!-- w w w . h t m l p o i n t . c o m -->
<!-- w w w . h t m l p o i n t . c o m -->
<HTML>
<HEAD>
<!-- Código descargado gratuitamente de HTMLpoint, el sitio italiano del web publishing
http://www.htmlpoint.com -->
<TITLE>Ejemplos Javascript: ejemplo práctico </TITLE>
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
function doCookie() {
if(document.cookie) {
index = document.cookie.indexOf("MioCookie");
} else {
index = -1;
}
if (index == -1) {
document.cookie="MioCookie=1; expires=Wednesday, 31-Dec-1997 07:00:00 EST";
} else {
countbegin = (document.cookie.indexOf("=", index) + 1);
countend = document.cookie.indexOf(";", index);
if (countend == -1) {
countend = document.cookie.length;
}
count = eval(document.cookie.substring(countbegin, countend)) + 1;
document.cookie="MioCookie="+count+"; expires=Wednesday, 01-Dec-1997 07:00:00 EST";
}
}
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
function gettimes() {
if(document.cookie) {
index = document.cookie.indexOf("MioCookie");
if (index != -1) {
countbegin = (document.cookie.indexOf("=", index) + 1);
countend = document.cookie.indexOf(";", index);
if (countend == -1) {
countend = document.cookie.length;
}
count = document.cookie.substring(countbegin, countend);
if (count == 1) {
rating = "Ésta es la segunda vez que ves esta página."
return (count+" <B>volta.<br></B> "+rating);
}
else { if (count < 5) { rating = "Éste es el tercer mensaje" }
else { if (count < 12) { rating = "Pero ¡ ¿no te has cansado de hacer clic?!" }
else { if (count < 18) { rating = "Quinto mensaje" }
else { if (count < 26) { rating = "Sexto mensaje" }
else { if (count < 34) { rating = "Séptimo mensaje" }
else { if (count < 48 ) { rating = "Octavo mensaje" }
else { if (count < 80 ) { rating = "Noveno mensaje" }
else { if (count < 100 ) { rating = "Penúltimo mensaje" }
else { rating = " ¡ÃÅ¡ltimo mensaje machacón...!" }
}
}
}
}
}
}
}
}
return (count+" <B>veces. <br></B> "+rating);
}
}
return ("0 <B>veces.<br> Haz clic en el botón Reload !</B>");
}
</SCRIPT>
</HEAD>
<BODY bgcolor="white" onUnload="doCookie()">
<script>
document.write("<B>Has visitado esta página</B> "+gettimes());
</script>
</body>
</html>
<!-- w w w . h t m l p o i n t . c o m -->
