JS代码：
function s20(){ var data=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"]; for(var j=0;j<500;j++){ //500为想要产生的行数var result="";for(var i=0;i<20;i++){ //产生20位就使i<20r=Math.floor(Math.random()*16); //16为数组里面数据的数量，目的是以此当下标取数组data里的值！ result+=data[r]; //输出20次随机数的同时，让rrr加20次，就是20位的随机字符串了。 } document.write(result); document.write("<br/>"); } }完整html代码：
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <script type="text/javascript"> function s20(){ var data=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"]; for(var j=0;j<500;j++){ var result=""; for(var i=0;i<20;i++){ r=Math.floor(Math.random()*16);result+=data[r]; } document.write(result); document.write("<br/>"); } } </script> </head> <body> <input type="button" onclick="s20()" value="产生随机数"> </body> </html>