如何計算此時此刻的時間，其實非常簡單。只需要掌握時間的api既可以計算出來。
<!DOCTYPE html>
<html>
<head>
<style>
</style>
<script src="../../../201902/demo09/js/jquery.min.js"></script>
</head>
<body class="ancestors">
<script>
var time=new Date();
var year=time.getFullYear();
var month=time.getMonth()+1;
var day=time.getDate();
var hour=time.getHours();
var minutes=time.getMinutes();
var seconds=time.getSeconds();
var week=time.getDay();
function addTwo(m){
return m<10?'0'+m:m
}
var weekDay=new Array(7);
weekDay[0]="週日";
weekDay[1]="週一";
weekDay[2]="週二";
weekDay[3]="週三";
weekDay[4]="週四";
weekDay[5]="週五";
weekDay[6]="週六";
console.log('現在的時間是'+year+'/'+addTwo(month)+'/'+addTwo(day)+weekDay[week]+' '+addTwo(hour)+':'+addTwo(minutes)+':'+addTwo(seconds))
</script>
</body>
</html>