js日期常用方法

js获取日期时间格式

export function formatDateTime(timeStamp) {
    var date = new Date();
    date.setTime(timeStamp);
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    var d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    var h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    var minute = date.getMinutes();
    var second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
}

js获取日期

export function formatDate(timeStamp) {
    var date = new Date();
    date.setTime(timeStamp);
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    var d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    return y + '-' + m + '-' + d;
};

js获取时间格式

export function formatTime(timeStamp) {
    var date = new Date();
    date.setTime(timeStamp);
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    var d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    var h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    var minute = date.getMinutes();
    var second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return h+':'+minute+':'+second;
};

获取近7天，近15天等的所有日期

getDate(7) // ["2019-04-17", "2019-04-18", "2019-04-19", "2019-04-20", "2019-04-21", "2019-04-22", "2019-04-23"]
getDate(15)


function getDate(num){
    let arr = [];
    for (let index = 0; index < num; index++) {
        arr.push(getDay(-index))
    }
    return arr.reverse();
}

export function getDay(day){
　　var today = new Date();
　　var targetday_milliseconds=today.getTime() + 1000*60*60*24*day;
　　today.setTime(targetday_milliseconds); //注意，这行是关键代码
　　var tYear = today.getFullYear();
　　var tMonth = today.getMonth();
　　var tDate = today.getDate();
　　tMonth = doHandleMonth(tMonth + 1);
　　tDate = doHandleMonth(tDate);
　　return tYear+"-"+tMonth+"-"+tDate;
}

function doHandleMonth(month){
　　var m = month;
　　if(month.toString().length == 1){
　　　m = "0" + month; 
　　}
　　return m; 
}

获取某一天日期到某一天日期的所有日期

getYearAndMonthAndDay('2019-4-20','2019-4-23')
function nextDay(date,end,arr){
    arr.push( formatDate(date) )
    var date = date + 1000*60*60*24*1;
    if(date<end){
        nextDay(date,end,arr);
    }
    return arr;
}
function getYearAndMonthAndDay(start,end){
    var result = [];
    var start_time = new Date(start).getTime();
    var end_time = new Date(end).getTime();
    result = nextDay(start_time,end_time,[]);
    result.push( formatDate(end));
    return result;
}