【企业微信多选的星期数据生成如“周一、周三至周六“】

目标效果如下图在这里插入图片描述
实现这个过程首先是要找到逻辑，这个看似简单的操作却属实让我想了很久。

首先要了解需求

根据拿到的数据得到生成符合要求的字符串。中间有连续的星期大于三天的，开始和结束星期中间要有"至"。

分析逻辑

一、判断开始日期和结束日期之间连续不连续，有多少天连续。数据不连续了，开始和最后星期赋值相同，继续判断。拼接字符串

以下是我的代码，敬请拜读。

<el-form-item prop="timeArray" label="打卡时间:">
            <div v-for="item in form.timeArray" style="margin-top: 5px">
              <span style="margin-left: 10px">上班</span>
              <el-time-picker
                style="width: 150px;margin-left: 10px"
                value-format="HH:mm"
                format="HH:mm"
                v-model="item.startTime"
                placeholder="任意时间点">
              </el-time-picker>
              <span style="margin-left: 10px">—下班</span>
              <el-time-picker
                style="width: 150px;margin-left: 10px"
                value-format="HH:mm"
                format="HH:mm"
                v-model="item.endTime"
                placeholder="任意时间点">
              </el-time-picker>
              <i class="el-icon-remove" @click="deleteTimeArray(item)" v-if="form.timeArray.length!=1" style="font-size: 25px; margin-left: 10px; margin-bottom: 5px;"></i>
              <i class="el-icon-circle-plus" @click="addTimeArray" v-if="form.timeArray.indexOf(item)==form.timeArray.length-1&&form.timeArray.length!=4" style="font-size: 25px; margin-left: 10px; margin-bottom: 5px;"></i>
            </div>
</el-form-item>
weekdays: [
        {
        label: "星期一",
        value: 1
      }, {
        label: "星期二",
        value: 2
      }, {
        label: "星期三",
        value: 3
      }, {
        label: "星期四",
        value: 4
      }, {
        label: "星期五",
        value: 5
      }, {
        label: "星期六",
        value: 6
      }, {
        label: "星期日",
        value: 7
      }
],
      
getWeekString(arr) {
      const weekArray = ["周一", "周二", "周三", "周四", "周五", "周六", "周日"];
      arr.sort(function(a, b) {
        return a - b;
      });
      let result = "";
      let start = -1;
      let end = -1;
      for (let i = 0; i < arr.length; i++) {
        if (start === -1) {
          start = arr[i];
          end = arr[i];
        } else if (arr[i] === end + 1) {
          end = arr[i];
        } else {
          if (start === end) {
            result += weekArray[start - 1] + "、";
          } else if (end - start === 1) {
            result += weekArray[start - 1] + "、" + weekArray[end - 1] + "、";
          } else {
            result += weekArray[start - 1] + "至" + weekArray[end - 1] + "、";
          }
          start = arr[i];
          end = arr[i];
        }
      }

      if (start !== -1) {
        if (start === end) {
          result += weekArray[start - 1];
        } else if (end - start === 1) {
          result += weekArray[start - 1] + "、" + weekArray[end - 1];
        } else {
          result += weekArray[start - 1] + "至" + weekArray[end - 1];
        }
      }
      this.form.result=result;
    },