工具函数

工具函数：

export default {
  methods: {
    getDay(day) {
      var today = new Date();
      var targetday_milliseconds = today.getTime() + 1000 * 60 * 60 * 24 * day;
      today.setTime(targetday_milliseconds); //注意，这行是关键代码
      var tYear = today.getFullYear();
      var tMonth = today.getMonth();
      var tDate = today.getDate();
      tMonth = this.doHandleMonth(tMonth + 1);
      tDate = this.doHandleMonth(tDate);
      return tYear + "-" + tMonth + "-" + tDate;
    },
    doHandleMonth(month) {
      var m = month;
      if (month.toString().length == 1) {
        m = "0" + month;
      }
      return m
    },
    // tools
    isOkArray(val) {
      return val && Array.isArray(val) && val.length != 0
    },
    /**
     * @function【common function】
     * 添加多项的加、减按钮操作
     * @param {*} item 要删除的项
     * @param {Number} index 要删除的项的索引
     */
    removeDomain(item, index, target) {
      console.log(index)
      this.form[target].splice(index, 1)
    },
    addDomain(item, target, keys) {
      // this.obj = Object.assign({},this.obj,{a:1,b:2});
      this.form[target].push({
        key: Date.now(),
        ...keys
      })
    },

    isUndef(v) {
      return v === undefined || v === null
    },
    isDef(v) {
      return v !== undefined && v !== null
    },
    isTrue(v) {
      return v === true
    },
    isFalse(v) {
      return v === false
    },
  }
}

使用：

getDay(0) //今天
getDay(-1) //近一天
getDay(-7) //近一周
getDay(-30) //近一个月