el-date-picker 只能选择后三个工作日并且遇到周末要顺延

您可以使用 moment.js 库来计算日期并过滤掉周末，然后将结果传递给 el-date-picker 组件。以下是一个示例代码片段：

<template>
  <el-date-picker
    v-model="selectedDate"
    :disabled-date="disabledDate"
    :picker-options="pickerOptions"
  ></el-date-picker>
</template>

<script>
import moment from 'moment';

export default {
  data() {
    return {
      selectedDate: null,
      pickerOptions: {
        disabledDate: (time) => {
          const currentDate = moment();
          const selectedDate = moment(time);
          const diff = selectedDate.diff(currentDate, 'days');
          const isWeekend = selectedDate.day() === 6 || selectedDate.day() === 0;
          return diff < 1 || diff > 3 || isWeekend;
        },
      },
    };
  },
  methods: {
    disabledDate(time) {
      const currentDate = moment();
      const selectedDate = moment(time);
      const diff = selectedDate.diff(currentDate, 'days');
      const isWeekend = selectedDate.day() === 6 || selectedDate.day() === 0;
      return diff < 1 || diff > 3 || isWeekend;
    },
  },
};
</script>

在这个示例中，我们使用 moment.js 库来计算当前日期和所选日期之间的天数差异，并检查所选日期是否是周末。如果日期不在后三个工作日范围内或者是周末，我们就将其禁用。我们还将 `disabledDate` 方法传递给 `picker-options` 属性，以便在日期选择器中禁用无效日期。