自網頁特效產生後，好多瀏覽器中都有內置的亂數發生方法。 例如：
var number =math.random();
該方法產生一個0到1之間的浮點數。
rnd.today=new date();
rnd.seed=rnd.today.gettime();
function rnd() {
rnd.seed = (rnd.seed*9301+49297) % 233280;
return rnd.seed/(233280.0);
};
function rand(number) {
return math.ceil(rnd()*number);
};
下面看一個隨機生成抽獎函數
function stringresource(k) { return stringresource[k] || k; }
function randomselector() {
var f = 0, c = [];
return function (v, r) {
if (arguments.length) {
if (r <= 0) throw { message: stringresource("invalid_argument") };
c.push([r, v]);
f += r;
} else {
var i = 0; r = math.random() * f;
for (; ; ) if ((r -= (v = c[i++])[0]) < 0) return v[1];
}
};
}
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