jq实现数字随时间增加

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<html><head>    <meta charset="utf-8">    <meta name="description" content="this" />    <meta name="keywords" content="this" />    <title>this</title>    <script type="text/javascript" src="jquery.js"></script><!--    引入我本地jquery文件http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js-->    <script type="text/javascript">        $(function() {            function  initial(num,initial,time) {                var time = time;                var oldnum = 3600*time/1000;                var o = $('.num')                var start_Date= new Date(initial);                var sec = (new Date().getTime()-start_Date.getTime())/oldnum;                var nowNum = parseInt(sec + num);                setInterval(function(){++nowNum;o.html(nowNum)},time)            };            initial (1800,'2017/6/12 15:00',1000);// 初始数值，初始日期，增加数值间隔(ms)        })    </script></head><body><span class="num">50</span></body></html>

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