JavaScript Tutorial/Math/LOG2E
Версия от 18:52, 25 мая 2010; (обсуждение)
Math.LOG2E
The LOG2E property of the Math object calculates the base 2 logarithm of Euler"s constant.
The return value is approximately 1.442.
<html>
<body>
<script language="JavaScript">
<!--
function doMath(){
var result = Math.LN2E;
document.form1.answer.value = result;
}
-->
</script>
<form name=form1>
The Base 2 logarithm of Euler"s constant is:
<input type="text" name="answer" size=20>
<input type="button" value="Calculate" onClick="doMath()">
<br>
</form>
</body>
</html>
The value of the Logarithm to base 2 of E: Math.LOG2E
<html>
<head>
<title>The Properties of the Math object</title>
<script type="text/javascript" language="javascript">
<!-- //
function DisplayMath(){
document.write("<br/><P>The value of the Logarithm to base 2 of E is: " + Math.LOG2E + "</p>");
}
// -->
</script>
</head>
<body onload="DisplayMath()">
</body>
</html>