function nowDate() {
  var today = new Date();
  var week = today.getDay();
  var day = "";
  switch (week) {
    case 0: day = "日"; break;
    case 1: day = "一"; break;
    case 2: day = "二"; break;
    case 3: day = "三"; break;
    case 4: day = "四"; break;
    case 5: day = "五"; break;
    case 6: day = "六"; break;
  }
  var date = today.getFullYear() + "-" + (today.getMonth() + 1 ) + "-" + today.getDate() + " 星期" + day + " ";
  document.write(date);
}