可以使用substring 方法提取字符串中介于两个指定下标之间的字符。
方法形式：substring(start,end)
举例：截取年月日部分的日期，代码如下：
var dateTime = new Date()
var hour = dateTime.getHours()
var min = dateTime.getMinutes()
var sec = dateTime.getSeconds()
var yy = dateTime.getFullYear()
var dd = dateTime.getDate()
var mm = dateTime.getMonth()
var time= yy + "-" + mm+1 + "-" + dd + " " + hour + ":" + min + ":" + sec
console.log(time.substring(0,10))；
截取结果如下图所示：
JS有自带的日期函数，获取如下：var date = new Date()var year = date.getFullYear()//获取年份var month = date.getMonth()+1//获取月份，因为是从0-11所以要+1var day = date.getDate()//获取天数var hour = date.getHours()//获取小时var minute = date.getMinutes()//获取分钟var second = date.getSeconds()//获取秒function showTime() {var now = new Date()
var nowTime = now.toLocaleString()
var date = nowTime.substring(0,10)//截取日期
var time = nowTime.substring(10,20) //截取时间
var week = now.getDay() //星期
var hour = now.getHours() //小时
//判断星期几
var weeks = ["日","一","二","三","四","五","六"]
var getWeek = "星期" + weeks[week]
var sc
//判断是AM or PM
if(hour >= 0 && hour < 5){
sc = '凌晨'
}
else if(hour > 5 && hour <= 7){
sc = '早上'
}
else if(hour > 7 && hour <= 11){
sc = '上午'
}
else if(hour > 11 && hour <= 13){
sc = '中午'
}
else if(hour> 13 && hour <= 18){
sc = '下午'
}
else if(hour > 18 && hour <= 23){
sc = '晚上'
}
document.getElementById('time').innerHTML ="当前时间：" + date+" " + getWeek +" "+" "+sc+" "+time
setTimeout('showTime()',1000)
}
</script>
调用方法:
<body onload="showTime()">
<div id="time"></div>
</body>
2.简洁的办法: 显示格式: 当前时间： 2010年6月1日 10:00:00 星期一
<htmtl>
<head></head>
<body>
<div id="linkweb" style=" display:inline"></div>
<script>
setInterval("document.getElementById('linkweb').innerHTML=new Date ().toLocaleString()+' 星期'+'日一二三四五六'.charAt(new Date().getDay ())",1000)
</script>
</body>
</html>
