前端开发小技巧js-时间处理

1. 获取当天0点0分0秒(date格式)

export function getTime1() {
  var date = new Date();
  date.setHours(0);
  date.setMinutes(0);
  date.setSeconds(0);
  return date;
}

2. 获取当天23点59分59秒(date格式)

export function getTime2() {
  var date = new Date();
  date.setHours(23);
  date.setMinutes(59);
  date.setSeconds(59);
  return date;
}

3. 获取上月这天(date格式,到秒)

export function getLastMonthTime() {
  var date = new Date(new Date().getTime() - 30 * 24 * 3600 * 1000);
  return date;
}

秒转为时分秒格式

export function formatSeconds(value) {
  var theTime = parseInt(value); // 秒
  if (theTime > 60) {
    var h = Math.floor(theTime / 3600);
    var m = Math.floor((theTime / 60 % 60)) < 10 ? '0' + Math.floor((theTime / 60 % 60)) : Math.floor((theTime / 60 % 60));
    var s = Math.floor((theTime % 60)) < 10 ? '0' + Math.floor((theTime % 60)) : Math.floor((theTime % 60));
    return value = h + "h" + m + "''" + s + "'";

  } else {
    var s = Math.floor((theTime % 60)) < 10 ? '0' + Math.floor((theTime % 60)) : Math.floor((theTime % 60));
    return s + "'";
  }
}

h和秒之间加个空格?(...要求)

export function forMateTime(obj) {
if (obj) {
if (obj.indexOf('h') > 0) {
return obj.split('h')[0] + 'h ' + obj.split('h')[1];
} else {
return obj
}
} else {
return '--';
}
}

date格式转为字符串格式

export  function padLeftZero(str) {
    return ("00" + str).substr(str.length);
}
export function formatDate(date, fmt) {
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(
      RegExp.$1,
      (date.getFullYear() + "").substr(4 - RegExp.$1.length)
    );
  }
  let o = {
    "M+": date.getMonth() + 1,
    "d+": date.getDate(),
    "h+": date.getHours(),
    "m+": date.getMinutes(),
    "s+": date.getSeconds()
  };
  for (let k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      let str = o[k] + "";
      fmt = fmt.replace(
        RegExp.$1,
        RegExp.$1.length === 1 ? str : padLeftZero(str)
      );
    }
  }
  return fmt;
}
let date = new Date();
let time = formatDate(date, "yyyy-MM-dd hh:mm:ss");//yyyy-MM-dd hh:mm:ss hh:mm:ss