Since the creation of web effects, many browsers have built-in random number generation method. For example:
var number =math.random ();
This method produces a floating-point number between 0 and 1.
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);
};
Let's look at a randomly generated lottery function
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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