Posted in Javascript onMay 11, 2017
本文实例讲述了JS简单生成随机数(随机密码)的方法。分享给大家供大家参考,具体如下:
1. Math.random()
生成一个0~1的随机数 0<=Math.random()<1
2. Math.random()*100
则生成一个0~100之间的随机数
3. Math.random()*100 + 100
则生成一个100~200之间的随机数
4. 所以Math.random()*m
则生成一个0~m的随机数
实例代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>JS随机数</title> </head> <body> <script language="javascript"> function randomPassword(size) { var seed = new Array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z', 'a','b','c','d','e','f','g','h','i','j','k','m','n','p','Q','r','s','t','u','v','w','x','y','z', '2','3','4','5','6','7','8','9' );//数组 seedlength = seed.length;//数组长度 var createPassword = ''; for (i=0;i<size;i++) { j = Math.floor(Math.random()*seedlength); createPassword += seed[j]; } return createPassword; } document.write(randomPassword(6)); </script> </body> </html>
运行结果:VrhPWe
JS简单生成随机数(随机密码)的方法
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Trip1声明:登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述。
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