Math.log 方法实例

<script language="JavaScript">

document.write( Math.log(Math.E) + "<br />" );
document.write(Math.log(10) + "<br />")
document.write( Math.log(1) + "<br />" );
document.write( Math.log(-1) );

</script>

运行该例子，输出：

1
2.302585092994046
0
NaN