<template>
 <div>
  <el-date-picker v-model="month" type="month" @change="monthChange" placeholder="选择月" />
  <p>
   当月的每一天：
   <span v-for="item in everyDay" :key="item" style="margin-right:10px;">{{item}}</span>
  </p>
 </div>
</template>

<script>
export default {
 data() {
  return {
   month: "",
   everyDay: []
  };
 },
 mounted(){
  let date = new Date(), month = date.getMonth();
  this.getEveryDay(date, month);
 },
 methods: {
  monthChange(date) {
   this.getEveryDay(date, date.getMonth());
  },
  getEveryDay(date, month) {
   //设置月份
   date.setMonth(month + 1);
   //设置一个月的某一天-这里设置为零则取到的日期中的天就会是当月的最后一天（比如，二月份就是28或29，其他月份就是30或31），方便下边的循环
   date.setDate(0);
   let dayArry = [];
   //获取月份的某一天
   let day = date.getDate();

   for (let i = 1; i <= day; i++) {
    date.setDate(i);  //如果只获取当前选择月份的每一天，则不需要date.setDate(i)只需dayArry.push(i)即可，其中date.setDate(i)是设置当前月份的每一天
    dayArry.push(i + ' ' + this.getWeekday(date.getDay()));  //选中月份的每一天和当天是星期几
   }

   this.everyDay = dayArry;
  },
  getWeekday(day){
   return ["周日", "周一", "周二", "周三", "周四", "周五", "周六"][day];
  },
 }
};
</script>

<template>
 <div style="margin:50px;">
  <el-date-picker v-model="month" type="month" @change="monthChange" placeholder="选择月" />
  <p style="margin-top:10px;">
   当月的每一天：
   <span v-for="item in everyDay" :key="item" style="margin-right:10px;" v-html="item"></span>
  </p>
 </div>
</template>

<script>
export default {
 data() {
  return {
   month: "",
   everyDay: []
  };
 },
 mounted(){
  let date = new Date(), month = date.getMonth();
  this.getEveryDay(date, month);
 },
 methods: {
  monthChange(date) {
   this.getEveryDay(date, date.getMonth());
  },
  getEveryDay(date, month) {
   //设置月份
   date.setMonth(month + 1);
   //设置一个月的某一天-这里设置为零则取到的日期中的天就会是当月的最后一天（比如，二月份就是28或29，其他月份就是30或31），方便下边的循环
   date.setDate(0);
   let dayArry = [];
   //获取月份的某一天
   let day = date.getDate();

   for (let i = 1; i <= day; i++) {
    date.setDate(i);
    if(date.getDay() == 0 || date.getDay() == 6){
     dayArry.push('<i class="red">' + i + '</i>');
    }else{
     dayArry.push(i);
    }
   }

   this.everyDay = dayArry;
  },
 }
};
</script>
<style>
.red{color:red;font-style:normal;}
</style>