JavaScript 获取当前日期与时间的实现方法

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>JS日期时间</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<script>
function getNowDate() {
 var date = new Date();
 var sign1 = "-";
 var sign2 = ":";
 var year = date.getFullYear() // 年
 var month = date.getMonth() + 1; // 月
 var day  = date.getDate(); // 日
 var hour = date.getHours(); // 时
 var minutes = date.getMinutes(); // 分
 var seconds = date.getSeconds() //秒
 var weekArr = ['星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期天'];
 var week = weekArr[date.getDay()];
 // 给一位数数据前面加 “0”
 if (month >= 1 && month <= 9) {
  month = "0" + month;
 }
 if (day >= 0 && day <= 9) {
  day = "0" + day;
 }
 if (hour >= 0 && hour <= 9) {
  hour = "0" + hour;
 }
 if (minutes >= 0 && minutes <= 9) {
  minutes = "0" + minutes;
 }
 if (seconds >= 0 && seconds <= 9) {
  seconds = "0" + seconds;
 }
 var currentdate = year + sign1 + month + sign1 + day + " " + hour + sign2 + minutes + sign2 + seconds + " " + week;
 return currentdate;
}
console.log(getNowDate());
</script>
</body>
</html>