JavaScript 昨天、今天、明天

//昨天的时间

  var day1 = new Date();

  day1.setTime(day1.getTime()-24*60*60*1000);

  var s1 = day1.getFullYear()+ "-" + (day1.getMonth()+1) + "-" + day1.getDate();

  //今天的时间

  var day2 = new Date();

  day2.setTime(day2.getTime());

  var s2 = day2.getFullYear()+ "-" + (day2.getMonth()+1) + "-" + day2.getDate();

  //明天的时间

  var day3 = new Date();

  day3.setTime(day3.getTime()+24*60*60*1000);

  var s3 = day3.getFullYear()+ "-" + (day3.getMonth()+1) + "-" + day3.getDate();

  //拼接时间

  function show(){

   var str = "" + s1 + "至" + s2;

   return str;

  }