el-date-picker 默认显示当前时间,且显示到分钟如：“2021-04-27 19:15”

用el-date-picker 显示当前时间，显示到分钟

初始化给此组件赋默认值,需要先import {date.js} from "./date.js"

mounted() {
    this.pollutionSpreadForm.dataTime = fomatDateToStr(
      new Date(),
      "yyyy-MM-dd hh:mm"
    );
  },

date.js

Date.prototype.Format = function(fmt) {
  let o = {
    "M+": this.getMonth() + 1, //月份
    "d+": this.getDate(), //日
    "h+": this.getHours(), //小时
    "m+": this.getMinutes(), //分
    "s+": this.getSeconds(), //秒
    "q+": Math.floor((this.getMonth() + 3) / 3), //季度
    S: this.getMilliseconds() //毫秒
  };
  if (/(y+)/.test(fmt))
    fmt = fmt.replace(
      RegExp.$1,
      (this.getFullYear() + "").substr(4 - RegExp.$1.length)
    );
  for (let k in o)
    if (new RegExp("(" + k + ")").test(fmt))
      fmt = fmt.replace(
        RegExp.$1,
        RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length)
      );
  return fmt;
};

export function formatTimeToStr(times, pattern) {
  let d = new Date(times).Format("yyyy-MM-dd hh:mm:ss");
  if (pattern) {
    d = new Date(times).Format(pattern);
  }
  return d.toLocaleString();
}

export function fomatDateToStr(date, pattern) {
  let d = date.Format("yyyy-MM-dd hh:mm:ss");
  if (pattern) {
    d = date.Format(pattern);
  }
  return d.toLocaleString();
}

export function fomatDateToStrToYMD(date, pattern) {
  let d = date.Format("yyyy-MM-dd");
  if (pattern) {
    d = date.Format(pattern);
  }
  return d.toLocaleString();
}

export function getDay(day) {
  let today = new Date();
  let targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
  today.setTime(targetday_milliseconds); //注意，这行是关键代码
  let tYear = today.getFullYear();
  let tMonth = today.getMonth();
  let tDate = today.getDate();
  let tHour = today.getHours() > 9 ? today.getHours() : "0" + today.getHours();
  let tSecond =
    today.getSeconds() > 9 ? today.getSeconds() : "0" + today.getSeconds();
  let tminute =
    today.getMinutes() > 9 ? today.getMinutes() : "0" + today.getMinutes();
  tMonth = doHandleMonth(tMonth + 1);
  tDate = doHandleMonth(tDate);
  return (
    tYear +
    "-" +
    tMonth +
    "-" +
    tDate +
    " " +
    tHour +
    ":" +
    tminute +
    ":" +
    tSecond
  );
}
function doHandleMonth(month) {
  let m = month;
  if (month.toString().length == 1) {
    m = "0" + month;
  }
  return m;
}
//获取当天时间00：00:00 ~23:59:59
export function getCurrDayTime(day, flag) {
  let today = new Date();
  let targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
  today.setTime(targetday_milliseconds); //注意，这行是关键代码
  let tYear = today.getFullYear();
  let tMonth = today.getMonth();
  tMonth = doHandleMonth(tMonth + 1);
  let tDate = today.getDate();
  let time = "";
  if (flag == "startTime") {
    time = tYear + "-" + tMonth + "-" + tDate + " 00:00:00";
  } else {
    time = tYear + "-" + tMonth + "-" + tDate + " 23:59:59";
  }
  return formatTimeToStr(time, "");
}

export function getMonthDays(year, month) {
  let stratDate = new Date(year, month - 1, 1),
    endData = new Date(year, month, 1);
  let days = (endData - stratDate) / (1000 * 60 * 60 * 24);
  return days;
}

显示效果