js取指定范围随机值
<HTML> <HEAD> <meta http-equiv="content-Type"content="text/html;nameset=utf-8"> <TITLE>取指定范围随机数</TITLE> <script type="text/javascript"> var names = ['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']; /* min<=取值<=max*/ function GetRandomNum(min,max) { var Range = max - min; var Rand = Math.random(); return (min + Math.round(Rand * Range)); } function getResult(){ var length = names.length-1; var index = GetRandomNum(0,length); alert(names[index]); } </script> </HEAD> <BODY> <button onclick="getResult()"> 随机取数</button> </BODY> </HTML>