输入类型周真的存在于HTML5中吗？
是的，存在输入类型=“week”，并允许您添加由根据ISO8601编码的年份和星期数组成的日期。您可以将其添加到以下内容：
<!DOCTYPE HTML>
<html>
<body>
<form action = "/cgi-bin/html5.cgi" method = "get">
Week : <input type = "week" name = "newinput" />
<input type = "submit" value = "submit" />
</form>
</body>
</html>