jq计算日期一个月

var date = new Date();

  // 默认一个月的数据获取时间开始

  var seperator1 = "-";

  var year = date.getFullYear();

  var month = date.getMonth() + 1;

  var strDate = date.getDate();

  if (month >= 1 && month <= 9) {

  month = "0" + month;

  }

  if (strDate >= 0 && strDate <= 9) {

  strDate = "0" + strDate;

  }

  // var currentdate = year + seperator1 + month + seperator1 + strDate;

  var lcurrentdate = year + seperator1 + month + seperator1 + strDate;

  //- 是向前倒推， + 是向后推  // 通过减去对应的天数来获取日期

  var weekdate = new Date(date.getTime() + 24 * 60 * 60 * 1000 * 30);

  var lastyear = weekdate.getFullYear();

  var lastmonth = weekdate.getMonth() + 1;

  var lastDate = weekdate.getDate();

  if (lastmonth >= 1 && lastmonth <= 9) {

  lastmonth = "0" + lastmonth;

  }

  if (lastDate >= 0 && lastDate <= 9) {

  lastDate = "0" + lastDate;

  }

  var currentdate = lastyear + seperator1 + lastmonth + seperator1 + lastDate;