path - 输出各种路径

• path(0) -> `/yskit/`
• path(1) -> `/yskit/index.php/`
• path() -> `/yskit/index.php/`
• path('r') -> `/yskit/index.php?r=`
• path('s') -> `/yskit/?r=`
• path('ui3nd') -> `/yskit/static/ui3nd`
• path('weys') -> `/yskit/static/weys`
• path('static') -> `/yskit/static`
• $_cbase['webRoot'] -> `/yskit`
• Demo: (显示地址已解析，请查看模板源码)
• src="/yskit/static/ui3nd/jsLibs/jquery-2.x.js"
• href="/yskit/static/weys/weys.css"
• /yskit/
• /yskit/index.php/demo-path
• /yskit/index.php?r=demo-path
• /yskit/?r=demo-path
• path('mod-key')=/yskit/index.php/mod-key
• path('demo.1234')=/yskit/index.php/demo.1234
• path('api:demo.1234')=/yskit/api.php/demo.1234
• path('nogroup:demo.1234')=/yskit/nogroup.php?r=demo.1234