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<span id="test"></span>
<script type="text/javascript">
setInterval(function(){
var st = 8 * 60*60;
var et = 23 * 60*60;
var now = new Date();
var nt = now.getHours()*60*60+now.getMinutes()*60+now.getSeconds();
var num = Math.floor((et-nt)/(et-st) * 50);
if (num>50)
num = 50;
else if (num<0)
num = 0;
document.getElementById("test").innerHTML = (num<10?"0":"")+num;
}, 1000);
</script>
<span id="test"></span>
<script type="text/javascript">
setInterval(function(){
var st = 8 * 60*60;
var et = 23 * 60*60;
var now = new Date();
var nt = now.getHours()*60*60+now.getMinutes()*60+now.getSeconds();
var num = (et-nt)/(et-st) * 50;
if (num>50)
num = 50;
else if (num<0)
num = 0;
document.getElementById("test").innerHTML = num.toFixed(3);
}, 1000);