Implementing random strings using JavaScript

　　Method one (in fact, a millisecond time numeric string):

JavaScript code

1. function RandomString () {
2. return ' + new Date (). GetTime ();
3. }

Method two (random alphanumeric string):

JavaScript code

2. var alpha_num_chars = ' 0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz '. Split (');
6. function RandomString (length) {
10. if (! Length) {
12. Length = Math.floor (Math.random () * alpha_num_chars.length);
14. }
18. var str = ';
20. For (var i = 0; i < length; i++) {
22. str + = Alpha_num_chars[math.floor (Math.random () * alpha_num_chars.length)];
24. }
26. return str;
28. }
32. Generate a random string of random length
34. RandomString ();
38. Generate a random string of length 8
40. RandomString (8);