请帮忙写个日期相关的JS程序

            <div id="day1" activeIndex="0" class="swiper-slide swiper-slide-active current"  style="">今天</div>
            <div id="day2" activeIndex="1" class="swiper-slide swiper-slide-next">明天</div>
            <div id="day3" activeIndex="2" class="swiper-slide">后天</div>
            <div class="swiper-slide" activeIndex="3">06月25日</div>
            <div class="swiper-slide" activeIndex="4">06月26日</div>
            <div class="swiper-slide" activeIndex="5">06月27日</div>
            <div class="swiper-slide" activeIndex="6">06月28日</div>
            <div class="swiper-slide" activeIndex="7">06月29日</div>
            <div class="swiper-slide" activeIndex="8">06月30日</div>
            <div class="swiper-slide" activeIndex="9">06月31日</div>

从06月25日至06月31日这几个DIV的文本要动态获得，JS能够获取当天的数据，剩下7天是几号要动态获取。

 <script>
    function getDateStr() {
        var d = new Date(), s = '',i=0;
        do {
            i++;
            s += '<div class="swiper-slide" activeindex="' + i + '">' + (d.getMonth() + 1) + '月' + d.getDate() + '日</div>';
            d.setDate(d.getDate() + 1);
        } while (i < 7);
        return s;
    }
    document.write(getDateStr())
</script>