假如 需求是 当前月往后不可选 且 可以往前选择近半年  例如可选范围是 2020-10 ～ 2021-05（结束时间以当前向前推半年），代码没有优化 里面很多方法可以合并 着急就先丢上来了 勿喷😉

 <el-date-picker
    v-model="value2"
    type="month"
    placeholder="选择月"
    :picker-options="pickerOptions"
 >
 </el-date-picker>

pickerOptions: {
    disabledDate: (time) => {
        const date = new Date();
        const year = date.getFullYear();
        let month = date.getMonth() + 1;
        if (month >= 1 && month <= 9) {
            month = '0' + month;
        }
        const currentdate = year.toString() + month.toString();  // 当前年月

        const page_year = time.getFullYear();
        let page_month = time.getMonth() + 1;
        if (page_month >= 1 && page_month <= 9) {
            page_month = '0' + page_month;
        }
        const pageDate = page_year.toString() + page_month.toString();  //页面中的年月


        let min_year = date.getFullYear();
        let min_month = date.getMonth() + 1 - 5;
        if(min_month <= 0) {
            min_year = min_year - 1;
            min_month = 12 + min_month;
        }
        if (min_month >= 1 && min_month <= 9) {
            min_month = '0' + min_month;
        }
        const minDate = min_year.toString() + min_month.toString(); // 最小年月

        return currentdate < pageDate || pageDate < minDate;
    },
},