项目开发过程中，一些常用的方法

// type = 1年月日，type=2时分秒,fommatter="-"表示年月日用-隔开，否则用"/"隔开
export function curTimeFun(type,fommatter) {
  const myDate = new Date();
  const year = myDate.getFullYear()>9?myDate.getFullYear():‘0‘+myDate.getFullYear();
  const month = (myDate.getMonth() + 1)>9?myDate.getMonth() + 1:‘0‘+(myDate.getMonth() + 1);
  const date = myDate.getDate()>9?myDate.getDate():‘0‘+myDate.getDate();
  const h = myDate.getHours()>9?myDate.getHours():‘0‘+myDate.getHours();       //获取当前小时数(0-23)
  const m = myDate.getMinutes()>9?myDate.getMinutes():‘0‘+myDate.getMinutes();     //获取当前分钟数(0-59)
  const s = myDate.getSeconds()>9?myDate.getSeconds():‘0‘+myDate.getSeconds();
  let nowTime = "";
  if(type == ‘1‘){
    if(fommatter == ‘-‘) {
      nowTime = year + ‘-‘ + month + "-" + date;
    } else {
      nowTime = year + ‘/‘ + month + "/" + date;
    }
  } else if(type == ‘2‘){
    nowTime = h + ‘:‘ + m + ":" + s;
  } else {
    if(fommatter == ‘-‘) {
      nowTime = year + ‘-‘ + month + "-" + date + " " + h + ‘:‘ + m + ":" + s;
    } else {
      nowTime = year + ‘/‘ + month + "/" + date + " " + h + ‘:‘ + m + ":" + s;
    }
  }
  return nowTime;
}

export function getWeekFun() {
  const weekDay = [‘星期日‘,‘星期一‘,‘星期二‘,‘星期三‘,‘星期四‘,‘星期五‘,‘星期六‘]
  let week = new Date().getDay();
  return weekDay[week];
}

export function getLastNYear(n) {
  const myDate = new Date;
  const curYear = myDate.getFullYear();
  if(n ==‘‘ || n==undefined || n == null){
    n =0;
  }
  let rstYear = curYear*1 - n*1;
  return rstYear;
}

export function getLastNMonth(n) {
  const myDate = new Date;
  const curYear = myDate.getFullYear();
  const curMonth = myDate.getMonth()+1; // 月份从0开始算起。需要加1
  if(n ==‘‘ || n==undefined || n == null){n =0;}
  let rstYear = ‘‘;
  let rstMonth = ‘‘;
  if(n>curMonth){ //表示去到去年的月份，年份需要去到上一年
    rstYear = curYear*1-1*1;
    rstMonth = 12-(n-curMonth)+1;
  } else {
    rstYear =curYear;
    rstMonth = curMonth -n;
  }
  rstMonth = (rstMonth)>9?rstMonth:‘0‘+(rstMonth);
  let rstYearMonth = rstYear + ‘-‘ + rstMonth;
  return rstYearMonth;
}

export function getLastNDate(n,fommatter) {
  const d = new Date();
  var myDate=new Date(d.getTime()-86400000*n);  // 获取前n天的日期
  const year = myDate.getFullYear()>9?myDate.getFullYear():‘0‘+myDate.getFullYear();
  const month = (myDate.getMonth() + 1)>9?myDate.getMonth() + 1:‘0‘+(myDate.getMonth() + 1);
  const date = myDate.getDate()>9?myDate.getDate():‘0‘+myDate.getDate();
  let last7Date = ‘‘;
  if(fommatter == ‘-‘) {
    last7Date = year + ‘-‘ + month + "-" + date;
  } else {
    last7Date = year + ‘/‘ + month + "/" + date;
  }
  return last7Date;
}

export function getLastNHour(n,fommatter) {
  const d = new Date();
  var myDate=new Date(d.getTime()-86400000*n);  // 获取前n天的日期
  const year = myDate.getFullYear()>9?myDate.getFullYear():‘0‘+myDate.getFullYear();
  const month = (myDate.getMonth() + 1)>9?myDate.getMonth() + 1:‘0‘+(myDate.getMonth() + 1);
  const date = myDate.getDate()>9?myDate.getDate():‘0‘+myDate.getDate();
  const h = myDate.getHours()>9?myDate.getHours():‘0‘+myDate.getHours();       //获取当前小时数(0-23)
  const m = myDate.getMinutes()>9?myDate.getMinutes():‘0‘+myDate.getMinutes();     //获取当前分钟数(0-59)
  const s = myDate.getSeconds()>9?myDate.getSeconds():‘0‘+myDate.getSeconds();
  let nowTime = "";
  if(fommatter == ‘-‘) {
    nowTime = year + ‘-‘ + month + "-" + date + " " + h + ‘:‘ + m + ":" + s;
  } else {
    nowTime = year + ‘/‘ + month + "/" + date + " " + h + ‘:‘ + m + ":" + s;
  }
  return nowTime;
}