JS generates random numbers

1 < Script >
2 Document. Write (parseint (10 * Math. Random ())); // Output 0 ~ A random integer between 10
3
4 Document. Write (math. Floor (math. Random () * 10 + 1 )); // Output 1 ~ A random integer between 10
5
6 Function Rndnum (n ){
7 VaR RND = "";
8 For ( VaR I = 0; I <n; I ++)
9 RND + = math. Floor (math. Random () * 10 );
10 Return RND;
11 }
12 Document. Write (rndnum (4 )); // Returns the random integer of a random number at the specified number of digits.
13
14
15
16 References:
17
18 1. Starting from 1 to any value
19 Parseint (math. Random () * Upper Limit + 1 );
20
21 2. From any value to any value
22 Parseint (math. Random () * (upper limit-lower limit + 1) + lower limit );
23 Function Frandomby (under, over ){
24 Switch (Arguments. Length ){
25 Case 1: Return Parseint (math. Random () * under + 1 );
26 Case 2: Return Parseint (math. Random () * (over-under + 1) + under );
27 Default : Return 0;
28 }
29 }
30 Document. Write (frandomby (1,100 )); // Output random Integers of random numbers within the specified range
31 </ Script >
32
33 // Pay different values for the specified text box according to the Rules [extended]
34 < Script >
35 Window. onload = Function (){
36 VaR O = Document. getelementsbytagname ('input ');
37 O [0]. value = frandomby (1, 10 );
38 O [1]. value = frandomby (11,20 );
39 O [2]. value = frandomby (1,100 );
40 O [3]. value = frandomby (51,100 );
41 }
42 </ Script >
43 1-10: < Input Type = "Text"   /> < BR />
44 11-20: < Input Type = "Text"   /> < BR />
45 1-100: < Input Type = "Text"   /> < BR />
46 51-100: < Input Type = "Text"   /> < BR />
47
48
49
50
51 < Html >
52 < Head >
53 < Title > Math </ Title >
54 </ Head >
55 < Body >
56 < Script Language = "JavaScript" Type = "Text/JavaScript" >
57 Total = 0
58 For (I = 1; I <= 5000; I ++)
59 {Num = math. Random ();
60 Total + = num
61 }
62 Average = total/5000
63 Average = math. Round (average * 1000)/1000
64 Document. Write (" 65 </ Script >
66 </ Body >
67 </ Html >