当前时间，本周，本月，本年的时间范围获取

js中获得当前时间是年份和月份，形如：201208
      
 //获取完整的日期
 var date=new Date;
 var year=date.getFullYear(); 
 var month=date.getMonth()+1;
 month =(month<10 ? "0"+month:month); 
 var mydate = (year.toString()+month.toString());

注意，year.toString()+month.toString()不能写成year+month。不然如果月份大于等于10，则月份为数字，会和年份相加，如201210，则会变为2022，需要加.toString()

 

以下是搜到的有用内容：

var myDate = new Date();
myDate.getYear(); //获取当前年份(2位)
myDate.getFullYear(); //获取完整的年份(4位,1970-????)
myDate.getMonth(); //获取当前月份(0-11,0代表1月)
myDate.getDate(); //获取当前日(1-31)
myDate.getDay(); //获取当前星期X(0-6,0代表星期天)
myDate.getTime(); //获取当前时间(从1970.1.1开始的毫秒数)
myDate.getHours(); //获取当前小时数(0-23)
myDate.getMinutes(); //获取当前分钟数(0-59)
myDate.getSeconds(); //获取当前秒数(0-59)
myDate.getMilliseconds(); //获取当前毫秒数(0-999)
myDate.toLocaleDateString(); //获取当前日期
var mytime=myDate.toLocaleTimeString(); //获取当前时间

myDate.toLocaleString( ); //获取日期与时间

{
    text:'今天',
    value(){
        const end = new Date();
        const start = new Date();
        return [start, end];
    }
},
{
  text:'本周',
    value(){
        // const end = new Date();
        // const start = new Date();
        // start.setTime(start.getTime() - 3600 * 1000 * 24 * 7);
        // return [start, end];

        var Nowdate=new Date();
        var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
        var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);
        var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);
        console.log(WeekLastDay,WeekFirstDay);
        return[WeekFirstDay,WeekLastDay];
    }
},
{
  text:'本月',
    value(){
        // const end = new Date();
        // const start = new Date();
        // start.setTime(start.getTime() - 3600 * 1000 * 24 * 30);
        // return [start, end];
        var Nowdate=new Date();
        var MonthFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth(),1);
        var MonthNextFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth()+1,1);
        var MonthLastDay=new Date(MonthNextFirstDay-86400000);
        // console.log(MonthFirstDay,MonthLastDay);
        return [MonthFirstDay, MonthLastDay];
    }
},
{
  text:'本年',
    value(){
        // const end = new Date();
        // const start = new Date();
        // start.setTime(start.getTime() - 3600 * 1000 * 24 * 365);
        // return [start, end];
        var Nowdate=new Date();
        var YearFirstDay=new Date(Nowdate.getFullYear(),0);
        var YearLastDay=new Date(Nowdate.getFullYear(),11,31);
        // console.log(YearFirstDay,YearLastDay)
        return [YearFirstDay,YearLastDay];
    }