JavaScript random number Generation method

Implementing random numbers is a common programming task in a variety of programming languages, and here's how to implement random numbers in JavaScript. The first method is implemented by overriding the Math.random method, and the second method is changed from a C implementation, which can realize the programming purpose. Tongyu County Zhong agrochemical

Directly on the code:

01	<script language="javascript">

02	varnative_random = Math.random;

03	Math.random = function(min, max, exact) {

04	if(arguments.length === 0)

05

{

06	returnnative_random();

07

}

08	elseif(arguments.length === 1)

09

{

10	max = min;

11

min = 0;

12

}

13	varrange = min + (native_random()*(max - min));

14	returnexact === void(0) ? Math.round(range) : range.toFixed(exact);

15

};

16	document.write(Math.random());

17	document.write(‘<br />‘);

18	document.write(Math.random(10));

19	document.write(‘<br />‘);

20	document.write(Math.random(3,10));

21	document.write(‘<br />‘);

22	document.write(Math.random(2,10,4));

23

</script>

The results of the program run as follows:

1	0.2989420900121331

2

7

3

9

4

2.2469

How do I implement random numbers without using math.random? The following function is changed from a C implementation:

01	varrandom = (function(){

02	varhigh = 1, low = 1 ^ 0x49616E42;

03	varshuffle = function(seed){

04	high = seed;

05	low = seed ^ 0x49616E42;

06

}

07

08	returnfunction(){

09	vara = newDate()-0

10	shuffle(a);

11	high = (high << 16) + (high >> 16);

12	high += low;

13	low += high;

14	returnhigh;

15

}

16

})();

17

18	p(random());

JavaScript random number Generation method