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JavaScript Tutorial/Function/Function Definition - История изменений
2026-04-04T19:25:19Z
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Admin: 1 версия
2010-05-26T08:24:46Z
<p>1 версия</p>
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Admin
http://wbex.ru/index.php?title=JavaScript_Tutorial/Function/Function_Definition&diff=9082&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Calculation in function==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>A Simple Page</title><br />
<script language="JavaScript"><br />
<!--<br />
function inputCels()<br />
{<br />
var cels = 100;<br />
ansFah = doFahCalc(cels);<br />
alert(cels + " Degrees Celsius is " + ansFah + " Degrees Fahrenheit");<br />
}<br />
function inputFah()<br />
{<br />
var fah = 100;<br />
ansCel = doCelCalc(fah);<br />
alert(fah + " Degrees Fahrenheit is " + ansCel + " Degrees Celsius");<br />
}<br />
function doCelCalc(fah)<br />
{<br />
var ans = ((Number(fah) - 32) / 1.8);<br />
return (ans);<br />
}<br />
function doFahCalc(cels)<br />
{<br />
var ans = ((1.8 * Number(cels)) + 32);<br />
return (ans);<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
<input type="button" value="Convert Celsius to Fahrenheit" onClick="inputCels();"><br />
<br><br />
<br><br />
<input type="button" value="Convert Fahrenheit to Celsius" onClick="inputFah();"><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Define a function==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>Function Demo</title><br />
<script language="javascript" type="text/javascript"><br />
<!--<br />
function greetVisitor()<br />
{<br />
var myName = prompt("Name.", "");<br />
alert("Welcome " + myName + "!")<br />
}<br />
//--><br />
</script><br />
</head><br />
<body><br />
<h1>Function Demo</h1><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Define the simplest function==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>A Simple Page</title><br />
<script language="JavaScript"><br />
<!--<br />
function yourMessage()<br />
{<br />
alert("Your first function!");<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Functions==<br />
<br />
<p>All function declaration must begin with the keyword function followed by the name of the function.</p><br />
<p>Parentheses are placed after the function name to hold arguments.</p><br />
<p>If more than one argument are used, use commas to separate the arguments.</p><br />
<p>If no arguments, leave the space between the parentheses empty.</p><br />
<p>Curly brackets are used to contain the code related to the function.</p><br />
<p>Curly brackets are not optional.</p><br />
<p>JavaScript uses call by value.</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<SCRIPT LANGUAGE="JavaScript"><br />
<!--<br />
var aString = "A"<br />
var aNumber = 1;<br />
function test(aString, aNumber) {<br />
aString = "B";<br />
aNumber = 2;<br />
document.write("<BR><BR><BR><BR><BR>During function call:<BR>");<br />
document.write("aStringCopy=",aString,"<BR>");<br />
document.write("aNumberCopy=",aNumber,"<BR>");<br />
}<br />
document.write("<BR><BR><BR><BR><BR>Before function call:<BR>");<br />
document.write("aString=",aString,"<BR>");<br />
document.write("aNumber=",aNumber,"<BR>");<br />
<br />
test(aString,aNumber);<br />
<br />
document.write("<BR><BR><BR><BR><BR><BR><BR>After function call:<BR>");<br />
document.write("aString=",aString,"<BR>");<br />
document.write("aNumber=",aNumber,"<BR>");<br />
//--><br />
</SCRIPT><br />
</html></source><br />
<br />
<br />
<br />
== Recursive function==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<HTML><br />
<HEAD><br />
<SCRIPT><br />
function fib (inNum) {<br />
if (inNum == 0) <br />
var fibNum = 0;<br />
else{<br />
if (inNum == 1)<br />
fibNum = 1;<br />
else{<br />
fibNum = fib(inNum - 2) + fib(inNum - 1);<br />
}<br />
}<br />
return fibNum;<br />
}<br />
function writeFibs(topFib) {<br />
for (var i=0; i <= topFib ; i++) {<br />
document.write ("Fib(" + i + ") = " + fib(i) + " <br>");<br />
}<br />
}<br />
<br />
</SCRIPT><br />
</HEAD><br />
<BODY><br />
<FORM Name="theForm"><br />
<INPUT Type=Text Name="numFibs"><br />
<INPUT Type=Button Value="Show Fibs" onClick="writeFibs(numFibs.value);"><br />
</FORM><br />
</BODY><br />
</HTML></source></div>