4.3、Date日期对象、setInterval定时器方法

    // 7、Date内置对象
    var date = new Date();
    var data_target = new Date('2023-1-1');
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var data_date = date.getDate();
    var day = date.getDay();
    var hours = date.getHours();
    var minutes = date.getMinutes();
    var seconds = date.getSeconds();
    console.log("今天是：" + year + "年" + month + "月" + data_date + "日" + "，星期" + day);
    console.log("时间为：" + hours + ":" + minutes + ":" + seconds);

    // 8、setInterval方法计时器,每一秒输出一次
    var n = 0;
    setInterval(function () {
      console.log(n++);
    }, 1000)

    setInterval(function () {
      var date = new Date();
      var hours = date.getHours();
      var minutes = date.getMinutes();
      var seconds = date.getSeconds();
      console.log(hours + ":" + minutes + ":" + seconds);
    }, 1000)