js 获取指定日期

if($("input[name=‘startTime‘]").val()==""){
            $("input[name=‘startTime‘]").val(FormatDate(0));
        }

if($("input[name=‘startTime‘]").val()==""){
            $("input[name=‘startTime‘]").val(FormatDate(-1));
        }

//获取AddDayCount后的日期
    function FormatDate(AddDayCount) {
        var date = new Date();
        date.setDate(date.getDate() + AddDayCount); //获取AddDayCount天后的日期
        return date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + (date.getDate());
    }