迷域, 不同脚本引擎, 相同的写法, 效率怎么送别这么大呀....

最近在做一些效率测试,,,,
得出的结论是 IE 的脚本引擎最稳定, Opera 的最不稳定, Firefox 的处于中间....


运行下面的代码, 在 以上提到的浏览器上运行...
真有点迷域呀...


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<!-- DW6 -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>shawl.qiu template</title>
<script type="text/javascript">
//<![CDATA[

var iUnder = 1, iOver = 200;

var StartTime = new Date();

fRndNoRept(iUnder, iOver)

var EndTime = new Date();

defaultStatus =
"fRndNoRept("+iUnder+", "+iOver+"): "+(EndTime-StartTime);
;

var StartTime = new Date();

fRandomNoRepeat(iUnder, iOver)

var EndTime = new Date();

defaultStatus +=
" fRandomNoRepeat("+iUnder+", "+iOver+"): "+(EndTime-StartTime);
;

fRandomNoRepeat(iUnder, iOver);

function fRandomNoRepeat(iUnder, iOver)
{
if(!iUnder) iUnder = 100;
if(!iOver)
{
iOver = iUnder;
iUnder = 1;
}
iOver -= 0;
iUnder -= 0;

var ar = [];
var iArLenCount = 0;
var arLen = iOver-iUnder+1;
var iUnderCount = iUnder;
while(iUnderCount<=iOver)
{
ar[iArLenCount++] = iUnderCount++;
}

var str = ar.join();

var iMax = iOver*100;
var iCount = 0;

var arFinal = [];
var iarFinalCount = 0;
var iTemp = null;

while(/[0-9]/.test(str))
{
var Re = new RegExp("(\\b"+fRandomBy(iUnder,iOver)+"\\b)", "");
//alert(iTemp)

str =
str.replace
(
Re
,
function($1, $2)
{
ar[$2] = $2;
}
);
}
return ar;

function fRandomBy(under, over)
{// shawl.qiu script
switch(arguments.length)
{
case 1: return parseInt(Math.random()*under+1);
case 2: return parseInt(Math.random()*(over-under+1) + under);
default: return 0;
} // end switch
} // end function fRandomBy
} // end function fRandomNoRepeat

function fRndNoRept(iUnder, iOver)
{// shawl.qiu script
if(!iUnder&&iUnder===false) var iUnder=100;
if(!iOver){
var iOver=iUnder;
iUnder=1;
}
iUnder -=0; iOver -= 0;
var ar=[];
var iArLen=temp=0;
var bln;
var iMax = iOver-iUnder+1;

while(iArLen<iMax)
{
bln=true;
temp=fRandomBy(iUnder, iOver);
var iLenCount = 0;
while(iLenCount++<iArLen)
{
if(ar[iLenCount-1]==temp)
{
bln=false;
break;
}
} // end while 1
if(bln)ar[iArLen++]=temp;
} // end while
return ar;

function fRandomBy(under, over)
{// shawl.qiu script
switch(arguments.length)
{
case 1: return parseInt(Math.random()*under+1);
case 2: return parseInt(Math.random()*(over-under+1) + under);
default: return 0;
} // end switch
} // end function fRandomBy
} // end function fRndNoRept
//]]>
</script>
</head>
<body>

</body>
</html>