js取指定范围随机值【原】

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>

 

posted @ 2017-07-10 09:35  苦涩泪滴  阅读(780)  评论(0)  编辑  收藏  举报