获取当前日期的前一天

function getCurrentTime() {
  var keep = '';
  var date = new Date();
  var y = date.getFullYear();
  var m = date.getMonth() + 1;
  m = m < 10 ? '0' + m : m;
  var d = date.getDate() < 10 ? '0' + date.getDate() : date.getDate();
  var h = date.getHours() < 10 ? '0' + date.getHours() : date.getHours();
  var f = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes();
  var s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
  var rand = Math.round(Math.random() * 899 + 100);
  // keep = y + '-' + m + '-' + d + '' + h + '' + f + '' + s;
  keep = y + '-' + m + '-' + d
  return keep; //20160614134947
}

function getCurrentMonth() {
  var keep = '';
  var date = new Date();
  var y = date.getFullYear();
  var m = date.getMonth() + 1;
  m = m < 10 ? '0' + m : m;
  var d = date.getDate() < 10 ? '0' + date.getDate() : date.getDate();
  var h = date.getHours() < 10 ? '0' + date.getHours() : date.getHours();
  var f = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes();
  var s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
  var rand = Math.round(Math.random() * 899 + 100);
  // keep = y + '-' + m + '-' + d + '' + h + '' + f + '' + s;
  keep = y + '-' + m
  return keep; //20160614134947
}

// function getBeforeMonth() {
//   var keep = '';
//   var date = new Date();
//   var y = date.getFullYear();
//   var m = date.getMonth();
//   m = m < 10 ? '0' + m : m;
//   var d = date.getDate() < 10 ? '0' + date.getDate() : date.getDate();
//   var h = date.getHours() < 10 ? '0' + date.getHours() : date.getHours();
//   var f = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes();
//   var s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
//   var rand = Math.round(Math.random() * 899 + 100);
//   // keep = y + '-' + m + '-' + d + '' + h + '' + f + '' + s;
//   keep = y + '-' + m
//   return keep; //20160614134947
// }

function getBeforDay() {
  var keep = '';
  var date = new Date();
  var preDate = new Date(date.getTime() - 24*60*60*1000); //前一天
  var y = preDate.getFullYear();
  var m = preDate.getMonth() + 1;
  m = m < 10 ? '0' + m : m;
  var d = preDate.getDate() < 10 ? '0' + preDate.getDate() : preDate.getDate();
  var h = preDate.getHours() < 10 ? '0' + preDate.getHours() : preDate.getHours();
  var f = preDate.getMinutes() < 10 ? '0' + preDate.getMinutes() : preDate.getMinutes();
  var s = preDate.getSeconds() < 10 ? '0' + preDate.getSeconds() : preDate.getSeconds();
  var rand = Math.round(Math.random() * 899 + 100);
  // keep = y + '-' + m + '-' + d + '' + h + '' + f + '' + s;
  keep = y + '-' + m + '-' + d
  return keep; //20160614134947
}