<script>
document.write(parseInt(10*Math.random())); //輸出0～10之間的隨機整數
document.write(Math.floor(Math.random()*10+1)); //輸出1～10之間的隨機整數
function RndNum(n){
var rnd="";
for(var i=0;i<n;i++)
rnd+=Math.floor(Math.random()*10);
return rnd;
}
document.write(RndNum(4)); //輸出指定位元的隨機數的隨機整數
| 引用部分: |
| 1. 從1開始 至 任意值 parseInt(Math.random()*上限+1); 2. 從任意值開始 至 任意值 |
function fRandomBy(under, over){
switch(arguments.length){
case 1: return parseInt(Math.random()*under+1);
case 2: return parseInt(Math.random()*(over-under+1) + under);
default: return 0;
}
}
document.write(fRandomBy(1,100)); //輸出指定範圍內的隨機數的隨機整數
</script>
//給既定文字框按規則付不同的值［引申］
<script>
window.onload=function(){
var o=document.getElementsByTagName('input');
o[0].value=fRandomBy(1,10);
o[1].value=fRandomBy(11,20);
o[2].value=fRandomBy(1,100);
o[3].value=fRandomBy(51,100);
}
</script>
1-10: <input type="text" /><br />
11-20: <input type="text" /><br />
1-100: <input type="text" /><br />
51-100: <input type="text" /><br />
<html>
<head>
<title>Math</title>
</head>
<body>
<script language="javascript" type="text/javascript">
total = 0
for(i=1;i<=5000;i++)
{num=Math.random();
total +=num
}
average = total/5000
average = Math.round(average*1000)/1000
document.write("<h1>平均數："+average+"</h1>")
</script>
</body>
</html>
來自：http://hi.baidu.com/dmkj2008/blog/item/6bcfc4ce11c41c3cb600c827.html
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