element的datepicker日期选择器选择周一到周日并实现上一周和下一周

实现效果

页面初始化效果

点击上一周

点击下一周

实现选择周一和周日过程

1、采用el-date-picker组件，类型使用week

<el-date-picker
    v-model="weeklyDate"
    type="week"
    @change="newDateWeekHandle"
    placeholder="选择周" style="width: 230px">
</el-date-picker>

但是范围是从周日开始，从周一开始需要将firstDayOfWeek设置为 1

<el-date-picker
    v-model="weeklyDate"
    type="week"
    :picker-options="{'firstDayOfWeek': 1}"
    @change="newDateWeekHandle"
    placeholder="选择周" style="width: 230px">
</el-date-picker>

2、框里还需要展示周一和周日的范围，设置两个新的属性startDate和endDate

<el-date-picker
    :format="startDate + ' 至 ' + endDate"
    v-model="weeklyDate"
    type="week"
    :picker-options="{'firstDayOfWeek': 1}"
    @change="newDateWeekHandle"
    placeholder="选择周" style="width: 230px">
</el-date-picker>

根据model属性（默认是星期二），来算出展示的星期一和周期日

newDateWeekHandle(){
      const now = new Date(this.weeklyDate);
      const nowTime = now.getTime();
      const day = now.getDay();
      const oneDayTime = 24*60*60*1000;
      const mondayTime = nowTime - (day-1)*oneDayTime;
      const sundayTime = nowTime + (7-day)*oneDayTime;
      this.startDate = this.$moment(mondayTime).format('YYYY-MM-DD');
      this.endDate = this.$moment(sundayTime).format('YYYY-MM-DD');
},

这里用到了moment.js，需要引入

3、下载moment

npm install moment --save

为了可以全局使用到，在main.js中全局方法挂载

import moment from 'moment'
Vue.prototype.$moment = moment

4、选择之后才能展示范围，需要在页面初始化时就给model属性赋值

• 在created中调用getDateWeek方法
• 同时进行计算周一和周日

    getDateWeek(){
      const now = new Date();
      const nowTime = now.getTime();
      const day = now.getDay();
      const oneDayTime = 24*60*60*1000;
      const mondayTime = nowTime - (day-2)*oneDayTime;//默认是周二
      this.weeklyDate = new Date(mondayTime);
      this.newDateWeekHandle();
    },

实现上一周和下一周的切换功能

实际上就是计算model属性值就可以了，通过Date的setDate方法实现日期的相加减，然后根据新得到的日期计算就可以了

[参考文章][https://blog.csdn.net/yangmy_Shy/article/details/91380206]

    handleLast(){
      const last = new Date(this.weeklyDate);
      last.setDate(last.getDate()-7);//日期相加减
      this.weeklyDate = last;
      this.newDateWeekHandle();
    },
    handleNext(){
      const next = new Date(this.weeklyDate);
      next.setDate(next.getDate()+7);
      this.weeklyDate = next;
      this.newDateWeekHandle();
    },