js中时间戳和时间格式之间的转换

//时间格式转化
    getNowDate(timestamp) {
      var date = new Date(timestamp); //时间戳为10位需*1000，时间戳为13位的话不需乘1000
      var Y = date.getFullYear() + \'-\';
      var M = (date.getMonth() + 1 < 10 ? \'0\' + (date.getMonth() + 1) : date.getMonth() + 1) + \'-\';
      var D = date.getDate() < 10 ? \'0\' + date.getDate() : date.getDate();
      var h = date.getHours() < 10 ? \'0\' + date.getHours() : date.getHours();
      return Y + M + D + h + \':00\';
    },

//年月日时间戳
    getNownyr() {
      var nowdate = new Date();
      var shijianchuo = new Date().getTime();
      var year = new Date().getFullYear();
      var month = new Date().getMonth() + 1;
      var day = new Date().getDate();
      var nowdate2 = new Date(year + \'/\' + month + \'/\' + day).getTime();