简单的随机数实现

<div class="sjs_btn">当前查看文章的人数：<span id="cont-link">56</span></div>
<style>
<!--
.sjs_btn{margin-left: auto; margin-right: auto; padding:10px 20px; font-size: 22px;line-height: 1.0; color: #fff; background: #349de6;}
-->
</style>
<script type="text/javascript">
<!--
(function(){
    function GetRandomNum(Min,Max){   
        var Range = Max - Min;   
        var Rand = Math.random();   
        return(Min + Math.round(Rand * Range));   
    }   
    // 在线数
    var swtNo = document.getElementById("cont-link");
    var timer1 = setInterval(showSwt,2000);
    function showSwt(){
        timer1 ++;
        var swtnum = GetRandomNum(8,99);
        swtNo.innerHTML = swtnum;
        if(timer1 > 500){
            clearInterval(timer1);
        }    
    }
})();
-->
</script>