使用本机JS获取本地化的月份名称

var getMonth = function(idx) {

  var objDate = new Date();
  objDate.setDate(1);
  objDate.setMonth(idx-1);

  var locale = "en-us",
      month = objDate.toLocaleString(locale, { month: "long" });

    return month;
}

console.log(getMonth(1));
console.log(getMonth(12));

function getLocalDayNames() {
  let d = new Date(2000,0,3); // Monday
  let days = [];
  for (let i=0; i<7; i++) {
    days.push(d.toLocaleString('default',{weekday:'long'}));
    d.setDate(d.getDate() + 1);
  }
  return days;
}

console.log(getLocalDayNames());

function getLocalMonthNames() {
  let d = new Date(2000,0); // January
  let months = [];
  for (let i=0; i<12; i++) {
    months.push(d.toLocaleString('default',{month:'long'}));
    d.setMonth(i + 1);
  }
  return months;
}

console.log(getLocalMonthNames());