开发需求10-时间选择器组件封装（默认展示当前-往前一个月）

需求描述：

项目中多处使用到了时间范围选择器组件，并且有的需要默认选中当前日期-往前一个月?或者?展示最近7天等，所以最好是将其封装，通过props传递数据即可

代码实现：

// html
<template>
    <div class="disflex">
        <label style="margin-right:10px;">{{ datename }}</label>
        <el-date-picker
          v-model="dateRange"
          type="daterange"
          value-format="yyyy-MM-dd"
          clearable
          size="mini"
          @blur="getDate"
          range-separator="至"
          start-placeholder="开始日期"
          end-placeholder="结束日期">
        </el-date-picker>
    </div>
</template>

// js

<script>
  export default {
    props: ["dateName", "isNeedInitDate"]
    data() {
      return {
        dateRange: []
      };
    },
    create() {
        // 这里是控制初始化的时候是否需要显示默认时间
        if (this.isNeedInitDate == 'true') {
            this.getInitDate()
        }
        this.$emit("getDate", this.dateRange)
    },
    methods: {
        //默认展示当前日期-往前推一个月
        getInitDate() {
           //当前时间
           let nowdate = new Date()
           let year = nowdate.getFullYear().toString()
           let month = nowdate.getMonth()+1 < 10 ? "0" + (nowdate.getMonth()+1).toString() : (nowdate.getMonth()+1).toString()
           let day = nowdate.getDate()+1 < 10 ? "0" + (nowdate.getDate()+1).toString() : (nowdate.getDate()+1).toString()
           let nowdate = year + "-" + month + "-" + day

           //当天往前推一个月时间
           nowdate.setMonth(nowdate.getMonth()-1)
           let y = nowdate.getFullYear().toString()
           let m = nowdate.getMonth()+1 < 10 ? "0" + (nowdate.getMonth()+1).toString() : (nowdate.getMonth()+1).toString()
           let d = nowdate.getDate()+1 < 10 ? "0" + (nowdate.getDate()+1).toString() : (nowdate.getDate()+1).toString()
           let lastdate = y + "-" + m + "-" + d
           this.dateRange = [lastdate, nowdate]
        },
       getDate() {
         this.$emit('getDate', this.dateRange)
       },
       clearDate() {
          this.dateRange = []   
       },


        //默认展示月第一天-当天
        getInitDate() {
           //当前时间
           let date= new Date()
           let year = date.getFullYear().toString()
           let month = date.getMonth()+1 < 10 ? "0" + (nowdate.getMonth()+1).toString() : (nowdate.getMonth()+1).toString()
           let day = date.getDate()+1 < 10 ? "0" + (nowdate.getDate()+1).toString() : (nowdate.getDate()+1).toString()
           //当月第一天
           let start = year + "-" + month + "-01"
           //当天
           let end = year + "-" + month + "-" + day
           this.dateRange = [start, end]
        },
    }
  };
</script>

// 父组件引入：
<datePicker ref="datePicker" @getDate="getDate" isNeedInitDate="false">

getDate(val) {
    this.dateRange = val
}