<body>
<div id="show"></div>
<script>
//获取系统当前时间,实现钟表功能
function getTime(){
let today = new Date()
let year = today.getFullYear();
let month = today.getMonth() + 1;//获取月份，值为0-11 表示1-12月份
if(month <= 9){
month = "0"+month
}
let date = today.getDate();
if(date <= 9){
date = "0" + date
}
let hours = today.getHours();
if(hours <= 9){
hours = "0" + hours
}
let minutes = today.getMinutes()
if(minutes <= 9){
minutes = "0" + minutes
}
let seconds = today.getSeconds();
if(seconds <= 9){
seconds = "0" + seconds
}
let week = today.getDay();//值为0-6，表示周天到周六
switch(week) {
case 0: week = "日";break
case 1: week = "一";break
case 2: week = "二";break
case 3: week = "三";break
case 4: week = "四";break
case 5: week = "五";break
case 6: week = "六";break
}
let time = year +"-" + month +"-" + date +""+ hours +":"+ minutes +":"+ seconds+"星期"+week
document.getElementById("show").innerHTML = time;
}
setInterval("getTime()",1000) //每一秒执行一次
</script>
</body>
