例4，JS随机数显示
<!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">
<head>
<title>js随机数显示-www.jb200.com</title>
<script type="text/javascript">
var seconds = 30;
window.onload = function () {
setInterval("reMainTime()", 100);
}
function RndNum(n){
var rnd="";
for(var i=0;i<n;i++)
rnd+=Math.floor(Math.random()*10);
return rnd;
}
function reMainTime() {
if (seconds > 0) {
var divMsg = document.getElementById("msgDiv");
divMsg.innerHTML = RndNum(1);//丢入随机数
seconds--;
} else {
return;
}
}
</script>
</head>
<body>
<div id="msgDiv"></div>
</body>
</html>
例5，Js 随机数产生6位数字
<script type="text/javascript">
/**
* js随机数
* www.jb200.com
*/
function MathRand()
{
var Num="";
for(var i=0;i<6;i++)
{
Num+=Math.floor(Math.random()*10);
}
document.getElementById("Lb_Random").innerText=Num;
document.getElementById("Lb_Random").innerHTML=Num;
}
</script>