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一、日期处理1. 检察日期是否有效该方法用于检测给出的日期是否有效：
1234const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());isDateValid("December 17, 1995 03:24:00"); // true复制代码
2. 计算两个日期之间的间隔该方法用于计算两个日期之间的间隔时间：
1234const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)dayDif(new Date("2021-11-3"), new Date("2022-2-1")) // 90复制代码
距离过年还有90天~
3. 查找日期位于一年中的第几天该方法用于检测给出的日期位于今年的第几天：
1234const dayOfYear = (date) => Math.floor ...
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ctfshow命令执行题目（ctfshow）1.web29(VIP)1234567891011<?phperror_reporting(0);if(isset($_GET['c'])){ $c = $_GET['c']; if(!preg_match("/flag/i", $c)){ eval($c); } }else{ highlight_file(__FILE__);}
过滤了 flag 关键字
知识点
eval函数可以理解为代码执行 动态执行php代码
system函数可以理解为命令执行 执行shell命令
php最后一个语句可以没有分号
eval(phpinfo()) 无输出结果
eval(phpinfo();)有输出结果
eval(phpinfo()?>) 有输出结果
file _get_contents() 获取文件内容 以字符串方式返回 这道题屏蔽了flag.php所以不能使用这个 ...
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