js获取当前年月日-YYYYmmDD格式的实现代码

var nowDate = new Date();
 var year = nowDate.getFullYear();
 var month = nowDate.getMonth() + 1 < 10 ? "0" + (nowDate.getMonth() + 1)
  : nowDate.getMonth() + 1;
 var day = nowDate.getDate() < 10 ? "0" + nowDate.getDate() : nowDate
  .getDate();
 var dateStr = year + "-" + month + "-" + day;