在route.php中配置路由路径做html必须输入限定，例如：

'hellow/[:name]' => ['index/hellow', ['ext' => 'html']],

浏览器访问时
http://localhost/thinkphp5/hellow/1.h
http://localhost/thinkphp5/hellow/1.t
http://localhost/thinkphp5/hellow/1.m
http://localhost/thinkphp5/hellow/1.l
http://localhost/thinkphp5/hellow/1.ht
http://localhost/thinkphp5/hellow/1.htm
http://localhost/thinkphp5/hellow/1.html
均能正常访问，不懂为什么会这样，求解答