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JavaScript Tutorial/Math/round - История изменений
2026-04-04T21:30:24Z
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Admin: 1 версия
2010-05-26T08:24:35Z
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Admin
http://wbex.ru/index.php?title=JavaScript_Tutorial/Math/round&diff=8814&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Math.round()==<br />
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<p>Syntax</p><br />
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<!-- start source code --><br />
<br />
<source lang="javascript"><br />
math.round(num)</source><br />
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== Rounding a number to an integer==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<head><br />
<title>Rounding a number to an integer</title><br />
<script type="text/javascript" language="javascript"><br />
<!-- //<br />
function f(){<br />
var num1 = 0.3;<br />
var num2 = 0.1;<br />
var result ;<br />
result = num1 / num2;<br />
document.write(Math.round(result));<br />
}<br />
// --><br />
</script><br />
</head><br />
<body onload="f()"><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Use Math.round to calculate area==<br />
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<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 calcArea()<br />
{<br />
inpRadius = 3;<br />
alert(Math.round(Math.PI * ((inpRadius)*(inpRadius))));<br />
}<br />
function calcPeri()<br />
{<br />
inpRadius = 3;<br />
alert(Math.round(2 * Math.PI * (inpRadius)));<br />
}<br />
function calcVol()<br />
{<br />
inpRadius = 3;<br />
alert(Math.round(Math.PI * ((inpRadius)*(inpRadius)*(inpRadius)) * (4/3)));<br />
}<br />
// --><br />
</script><br />
</head><br />
<body><br />
<h1>All about Circles and Spheres!</h1><br />
<P>Click <input type="button" value="HERE" onclick="calcArea();"> to calculate circle area!</p><br />
<br><br />
<P>Click <input type="button" value="HERE" onclick="calcPeri();"> to calculate circle perimeter!</p><br />
<br><br />
<P>Click <input type="button" value="HERE" onclick="calcVol();"> to calculate sphere volume!</p><br />
</body><br />
</html></source></div>