for the problems encountered in the development process of the company, we adopted iview"s Vue framework. 
 there is a requirement: after the initial page, the optional time range of DatePicker is not limited, and the user can choose any day. When the user selects a (planTime) for a certain day and makes a content query, the time range of the DatePicker is limited to the month in which the planTime is located. 
 my solution at first: set both DatePicker,v-model to planTime. When the user selects a certain day and makes a query, it determines that the planTime is not empty to display the DatePicker control that "the time range was limited in the first place". However, because I don"t know which day the user will choose at first, I can only restrict the user to choose the current month at this time. 
 paste code: 
<Form-item label="">
    <div v-if="planTime == """>
      <Date-picker type="date" placeholder="" v-model="planTime" :options="optionsOfTime" key="one"
                   format="yyyy-MM-dd"></Date-picker>
    </div>
    <div v-else>
      <Date-picker type="date" placeholder="" v-model="planTime" key="two"
                   format="yyyy-MM-dd"></Date-picker>
    </div>
</Form-item>data() {
      return {
        optionsOfTime: {  // 
          disabledDate(date) {
            const myDate = new Date(),
              day = myDate.getDate()
            // 
            return date && Date.now() + (getNumOfMouthDays() - day) * 86400000 < date.valueOf() || date.valueOf() < Date.now() - day * 86400000;
          }
        },
        planTime: ""
        }
   }/**
 * 
 * @returns {number}
 */
export const getNumOfMouthDays = () => {
  var curDate = new Date();
  /*  */
  var curMonth = curDate.getMonth();
  /* : curMonth1, 1 */
  curDate.setMonth(curMonth + 1);
  /* curMouth 1 curDate setDate(0) */
  // setDate()1~31
  // setDate()
  // setDate(0)setDate(-1)
  // 31setDate(32)
  curDate.setDate(0);
  /*  */
   return curDate.getDate();
}  
 
