Multiple methods for generating random strings in JS

The following code records the computer for future reference.

Copy codeThe Code is as follows:
<Script language = "javascript">
Function randomString (len ){
Len = len | 32;
Var $ chars = 'abcdefghjkmnpqrstwxyzabcdefhijkmnprstwxyz2345678 ';/*** by default, oOLl, 9gq, Vv, Uu, I1 ****/
Var maxPos = $ chars. length;
Var pwd = '';
For (I = 0; I <len; I ++ ){
Pwd + = $ chars. charAt (Math. floor (Math. random () * maxPos ));
}
Return pwd;
}
Document. write (randomString (32 ));
</Script>

Call the randomString method. The len parameter is the length of the returned random string.

If the parameter is not included, 32 characters are output by default.

How to Use JS to generate random numbers!

Copy codeThe Code is as follows:
<Script>
Function GetRandomNum (Min, Max)
{
Var Range = Max-Min;
Var Rand = Math. random ();
Return (Min + Math. round (Rand * Range ));
}
Var num = GetRandomNum (1, 10 );
Alert (num );
</Script>

Var chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8 ', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'h', 'I ', 'J', 'k', 'l', 'M', 'n', 'O', 'P', 'Q', 'R','s ', 'T', 'U', 'V', 'w', 'x', 'y', 'z'];

Function generateMixed (n ){
Var res = "";
For (var I = 0; I <n; I ++ ){
Var id = Math. ceil (Math. random () * 35 );
Res + = chars [id];
}
Return res;
}

1. Math. random (); the result is a random number (including 0, not 1) between 0 and 1)
2. Math. floor (num); The num parameter is a numerical value, and the function result is an integer part of num.
3. Math. round (num); The num parameter is a numerical value, and the function result is an integer rounded to num.

Math: A mathematical object that provides mathematical computation of data.
Math. random (); returns a random number between 0 and 1 (including 0, excluding 1.

Math. ceil (n); returns the smallest integer greater than or equal to n.
When Math. ceil (Math. random () * 10) is used, a random integer ranging from 1 to 10 is obtained. The probability of a random integer from 0 is very small.

Math. round (n); returns the integer value after n rounding.
Use Math. round (Math. random (); a random integer ranging from 0 to 1 can be obtained evenly.
When Math. round (Math. random () * 10) is used, a random integer ranging from 0 to 10 can be obtained in a balanced manner. The probability of obtaining the minimum value 0 and the maximum value 10 is less than half.

Math. floor (n); returns the largest integer less than or equal to n.
When Math. floor (Math. random () * 10) is used, a random integer ranging from 0 to 9 can be obtained evenly.

Js generates random strings + timestamp acquisition

By default, JavaScript generates 13 BITs, which is required to pass to php./1000
Copy codeThe Code is as follows:
Timestamp = timestamp/1000;
<Script type = "text/javascript">
Function randomChar (l ){
Var x = "0123456789 qwertyuioplkjhgfdsazxcvbnm ";
Var tmp = "";
Var timestamp = new Date (). getTime ();
For (var I = 0; I <l; I ++ ){
Tmp + = x. charAt (Math. ceil (Math. random () * 100000000) % x. length );
}
Return timestamp + tmp;