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;

 }