时间函数一直记得比较混乱，所以抽时间好好学习了一下，下面是自己练手的一段输出当前时间的代码~
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>date</title>
</head>
<body>
<span id="dateText"></span>
</body>
<script type="text/javascript">
var spanObj = document.getElementById('dateText');
var time = new Date();
var year = time.getFullYear();
var month = time.getMonth() + 1;
month.toString().length == 1 && (month = '0' + month)
var date = time.getDate()
date.toString().length == 1 && (date = '0' + date)
var day = time.getDay()
var week = [{
condition: 1,
default: '一'
}, {
condition: 2,
default: '二'
}, {
condition: 3,
default: '三'
}, {
condition: 4,
default: '四'
}, {
condition: 5,
default: '五'
}, {
condition: 6,
default: '六'
}, {
condition: 7,
default: '日'
}]
var nowDay = week.filter(item => {
return item.condition == day
})[0].default
var hour = time.getHours()
hour.toString().length == 1 && (hour = '0' + hour)
var minutes = time.getMinutes()
minutes.length == 1 && (minutes = '0' + minutes)
var seconds = time.getSeconds()
seconds.toString().length == 1 && (seconds = '0' + seconds)
var milliseconds = time.getMilliseconds()
var timeStr = '现在是北京时间：' + year + '年' + month + '月' + date + '日' + '\xa0\xa0' + '星期' + nowDay +
'\xa0\xa0' + //在js字符串中加空格\xa0
hour + ':' + minutes + ':' + seconds
spanObj.textContent = timeStr
</script>
</html>
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