js获取周数据用作周期选择下拉框
2019-07-23 本文已影响0人
忧郁的冥
<html>
<title>测试</title>
<body>
<script>
var year = 2019 //选择年份
var lastDay = new Date(year + 1,0,0) // 一年的最后一天
var firstDay = new Date(year,0,1) // 一年的第一天
console.log(lastDay);
console.log(firstDay);
var obj = {}
var index = 1;
// var day = firstDay;
var day = new Date(year,0,1);
function formatDate(d){
return d.toLocaleDateString('zh-cn',{year: 'numeric', month: '2-digit',day: '2-digit'}).replace(/\//g,'-')
}
while (day < lastDay){
day.setDate(day.getDate() + 1)
if(day.getDay() === 0){
obj['第' + (index++) + '周'] = formatDate(firstDay) + ' 到 ' + formatDate(day)
firstDay = new Date(day.getTime() + 86400000)
}
}
if(day !== lastDay){
obj['第' + (index++) + '周'] = formatDate(firstDay) + ' 到 ' + formatDate(lastDay)
}
console.log(JSON.stringify(obj,null,' '))
</script>
</body>
</html>
