JS获取当前时间到30天之后的日期区间

<!doctype html>
<html>
 
    <head>
        <meta charset="utf-8">
        <title>获取当前时间到30天之后的日期区间</title>
    </head>
 
    <body>
        <script>
            var startDate = new Date();
            var endDate = new Date();
            endDate.setDate(startDate.getDate() + 30);
            var dataArr = [];
            var weeks = ['日', '一', '二', '三', '四', '五', '六'];
            while((endDate.getTime() - startDate.getTime()) >= 0) {
                var month = (startDate.getMonth() + 1).toString().length == 1 ? "0" + (startDate.getMonth() + 1).toString() : (startDate.getMonth() + 1);
                var day = startDate.getDate().toString().length == 1 ? "0" + startDate.getDate() : startDate.getDate();
                var week = weeks[startDate.getDay()];
                dataArr.push(month + "月" + day + '日（周' + week + '）');
                startDate.setDate(startDate.getDate() + 1);
 
            }
            dataArr[0] = '今天' + dataArr[0].slice(6, 10);
            dataArr[1] = '明天' + dataArr[1].slice(6, 10);
            dataArr[2] = '后天' + dataArr[2].slice(6, 10);
            console.log(dataArr);
        </script>
    </body>
 
</html>