vue 默认回显当前月份和默认回显的时间是本月19号到次月20号为一个月

1.默认回显当前月份

先写一个方法，然后在create中引用

 var nowDate = new Date();

      var date = {

        year: nowDate.getFullYear(),

        month: nowDate.getMonth() + 1,

        day: nowDate.getDate(),

      };

const dayDate =

        date.year + "-" + (date.month >= 10 ? date.month : "0" + date.month);

      var date = new Date();

      this.$set(this.ruleForm, "reportYearMonth", dayDate.toString());

2设置一个区间为一个月比如20号到19号为一个月

var nowDate = new Date();

      var date = {

        year: nowDate.getFullYear(),

        month: nowDate.getMonth() + 1,

        day: nowDate.getDate(),

      };

 if (date.day <= 19) {

        if (date.month > 1) {

          date.month = date.month - 1;

        } else {

          date.month = 12;

          date.year = date.year - 1;

        }

      }

const dayDate =

        date.year + "-" + (date.month >= 10 ? date.month : "0" + date.month);

      var date = new Date();

      this.$set(this.ruleForm, "reportYearMonth", dayDate.toString());