显示当前日期以及另外30天的计算-JS

Question

我试图通过查找字符串并替换为当前日期来显示当前日期，但可以正常工作，但是我想显示另一个日期，如果字符串具有一些逗号分隔值，那么它将添加到当前日期并显示因此，可以说，如果我在字符串中添加（，30），它将在当前日期中增加30天并显示

var setCurrentDate = function() {
        var disclaimerStr = $(".dynamic-date").html(),
            currDateStr = "{currentdate}",
            date = new Date(),
            months = [
                "January",
                "February",
                "March",
                "April",
                "May",
                "June",
                "July",
                "August",
                "September",
                "October",
                "November",
                "December"
            ],
            currDate =
                months[date.getMonth()] +
                " " +
                date.getDate() +
                ", " +
                date.getFullYear(),
            newDisclaimerStr;

        if (disclaimerStr.indexOf(currDateStr) != -1) {
            newDisclaimerStr = disclaimerStr.replace(currDateStr, currDate);
            $(".dynamic-date").html(newDisclaimerStr);
        }
    };
    setCurrentDate();

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="dynamic-date">
  <b>Current Date</b> : {currentdate} <br><br>
  <b>Extended Date</b> : {currentdate,30} <br><br>
</div>

Answer 1

尝试此代码：

var setCurrentDate = function() {
        var disclaimerStr = $(".dynamic-date").html(),
            currDateStr = "{currentdate}",
            date = new Date(),
            months = [
                "January",
                "February",
                "March",
                "April",
                "May",
                "June",
                "July",
                "August",
                "September",
                "October",
                "November",
                "December"
            ],
            currDate =
                months[date.getMonth()] +
                " " +
                date.getDate() +
                ", " +
                date.getFullYear(),
            newDisclaimerStr;

        if (disclaimerStr.indexOf(currDateStr) != -1) {
            newDisclaimerStr = disclaimerStr.replace(currDateStr, currDate);
            $(".dynamic-date").html(newDisclaimerStr);
        }
        
        
        var reg = new RegExp(/\{currentdate(,(\d+))\}/);
        var currDateStr2 = '{currentdate,30}'; // you need to change here!
        var days = parseInt(reg.exec(currDateStr2)[2], 10);
        console.log(days) //30
        
        var date2 = new Date();
        date2.setDate(date2.getDate() + days);
        
        console.log(date2) // "2019-04-27T09:13:00.789Z"
        
        
        
    };
    setCurrentDate();

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="dynamic-date">
  <b>Current Date</b> : {currentdate} <br><br>
  <b>Extended Date</b> : {currentdate,30} <br><br>
</div>