SOURCE

function showTime(){
  //var time = new Date();
  //alert(time);
  //alert(time.getFullYear());
  //alert(time.getMonth()+1);
  //alert(time.getDate()); 
  //alert(new Date(Date.parse("2017-12")));
  //alert(time < new Date(Date.parse("2017-12-21")));
  //var time = new Date(2017,12,1);
  //var resDate = new Date(time.getTime()-1000*60*60*24);
  //alert(resDate);
  alert(/'-'/.test("asfasdfas-asdfdasf"));
}

//格式化当前时间 yyyy-MM-dd
function formatDate(){
  return (new Date().Format("yyyy-MM-dd"));
}

<button onclick="showTime()">显示当前时间</button>