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# init | ||
*.xml |
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--在 Lua 5.1 语言中,元表 (metatable) 的表现行为类似于 C++ 语言中的操作符重载,例如我们可以重载 "__add" 元方法 (metamethod),来计算两个 Lua 数组的并集;或者重载 "__index" 方法,来定义我们自己的 Hash 函数。Lua 提供了两个十分重要的用来处理元表的方法,如下: | ||
--setmetatable(table, metatable):此方法用于为一个表设置元表。 | ||
--getmetatable(table):此方法用于获取表的元表对象 | ||
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------------------------------------------------------ 通过重载 "__add" 元方法来计算集合的并集实例: | ||
local set1 = {10,20,30} | ||
local set2 = {40,50,60} | ||
-- 将用于重载__add的函数,注意第一个参数是self | ||
local union = function (self, another) | ||
local set = {} | ||
local result = {} | ||
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-- 利用数组来确保集合的互异性 | ||
for i, j in pairs(self) do set[j] = true end | ||
for i, j in pairs(another) do set[j] = true end | ||
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-- 加入结果集合 | ||
for i, j in pairs(set) do table.insert(result, i) end | ||
return result | ||
end | ||
setmetatable(set1, {__add = union}) -- 重载 set1 表的 __add 元方法 | ||
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local set3 = set1 + set2 | ||
for _, j in pairs(set3) do | ||
io.write(j.." ") -->output:30 50 20 40 10 | ||
end |
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-- 类的继承 | ||
local Sharp = { _val = 1 } --① 父类 | ||
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function Sharp:new() | ||
local new_sharp = {} | ||
self.__index = self --②,self == Sharp Sharp.__index = Sharp 等价于 Sharp.__index = function(key) return Sharp[key] end | ||
setmetatable(new_sharp, self) | ||
return new_sharp | ||
end | ||
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-- define fun1 | ||
function Sharp:sharp_func() | ||
print("Sharp call sharp_func") | ||
end | ||
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-- define fun2 | ||
function Sharp:name() | ||
print("Sharp call name") | ||
end | ||
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-- define fun3 | ||
function Sharp:val() | ||
print(string.format("Sharp call val %d", self._val)) | ||
end | ||
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Circle = Sharp:new() --① 子类 | ||
function Circle:new() | ||
local new_circle = {} | ||
self.__index = self --②,self == Circle | ||
setmetatable(new_circle, self) --③ | ||
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return new_circle | ||
end | ||
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--新函数 | ||
function Circle:circle_func() | ||
print("Circle call circle_func") | ||
end | ||
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--覆盖函数name | ||
function Circle:name() | ||
print("Circle call name") | ||
end | ||
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--覆盖函数val | ||
function Circle:val() | ||
print(string.format("Circle call val %d", self._val)) | ||
end | ||
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local circle = Circle:new() | ||
circle._val = 2 --覆盖赋值 | ||
circle:sharp_func() --调用父类函数 | ||
circle:circle_func() --调用新函数 | ||
circle:name() --调用覆盖函数 | ||
circle:val() --调用覆盖函数 | ||
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--输出结果 | ||
--Sharp call sharp_func | ||
--Circle call circle_func | ||
--Circle call name | ||
--Circle call val 2 |
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#### [参考地址](https://mp.weixin.qq.com/s/Crj2Xo8-EJpbq40kXronug) | ||
#### Nginx 配置文件 nginx.conf 详解 | ||
```javascript | ||
#定义Nginx运行的用户和用户组 | ||
user www www; | ||
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#nginx进程数,建议设置为等于CPU总核心数。 | ||
worker_processes 8; | ||
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#全局错误日志定义类型,[ debug | info | notice | warn | error | crit ] | ||
error_log /var/log/nginx/error.log info; | ||
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#进程文件 | ||
pid /var/run/nginx.pid; | ||
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#一个nginx进程打开的最多文件描述符数目,理论值应该是最多打开文件数(系统的值ulimit -n)与nginx进程数相除,但是nginx分配请求并不均匀,所以建议与ulimit -n的值保持一致。 | ||
worker_rlimit_nofile 65535; | ||
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#工作模式与连接数上限 | ||
events | ||
{ | ||
#参考事件模型,use [ kqueue | rtsig | epoll | /dev/poll | select | poll ]; epoll模型是Linux 2.6以上版本内核中的高性能网络I/O模型,如果跑在FreeBSD上面,就用kqueue模型。 | ||
use epoll; | ||
#单个进程最大连接数(最大连接数=连接数*进程数) | ||
worker_connections 65535; | ||
} | ||
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#设定http服务器 | ||
http | ||
{ | ||
include mime.types; #文件扩展名与文件类型映射表 | ||
default_type application/octet-stream; #默认文件类型 | ||
#charset utf-8; #默认编码 | ||
server_names_hash_bucket_size 128; #服务器名字的hash表大小 | ||
client_header_buffer_size 32k; #上传文件大小限制 | ||
large_client_header_buffers 4 64k; #设定请求缓 | ||
client_max_body_size 8m; #设定请求缓 | ||
sendfile on; #开启高效文件传输模式,sendfile指令指定nginx是否调用sendfile函数来输出文件,对于普通应用设为 on,如果用来进行下载等应用磁盘IO重负载应用,可设置为off,以平衡磁盘与网络I/O处理速度,降低系统的负载。注意:如果图片显示不正常把这个改成off。 | ||
autoindex on; #开启目录列表访问,合适下载服务器,默认关闭。 | ||
tcp_nopush on; #防止网络阻塞 | ||
tcp_nodelay on; #防止网络阻塞 | ||
keepalive_timeout 120; #长连接超时时间,单位是秒 | ||
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#FastCGI相关参数是为了改善网站的性能:减少资源占用,提高访问速度。下面参数看字面意思都能理解。 | ||
fastcgi_connect_timeout 300; | ||
fastcgi_send_timeout 300; | ||
fastcgi_read_timeout 300; | ||
fastcgi_buffer_size 64k; | ||
fastcgi_buffers 4 64k; | ||
fastcgi_busy_buffers_size 128k; | ||
fastcgi_temp_file_write_size 128k; | ||
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#gzip模块设置 | ||
gzip on; #开启gzip压缩输出 | ||
gzip_min_length 1k; #最小压缩文件大小 | ||
gzip_buffers 4 16k; #压缩缓冲区 | ||
gzip_http_version 1.0; #压缩版本(默认1.1,前端如果是squid2.5请使用1.0) | ||
gzip_comp_level 2; #压缩等级 | ||
gzip_types text/plain application/x-javascript text/css application/xml; | ||
#压缩类型,默认就已经包含text/html,所以下面就不用再写了,写上去也不会有问题,但是会有一个warn。 | ||
gzip_vary on; | ||
#limit_zone crawler $binary_remote_addr 10m; #开启限制IP连接数的时候需要使用 | ||
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upstream blog.ha97.com { | ||
#upstream的负载均衡,weight是权重,可以根据机器配置定义权重。weigth参数表示权值,权值越高被分配到的几率越大。 | ||
server 192.168.80.121:80 weight=3; | ||
server 192.168.80.122:80 weight=2; | ||
server 192.168.80.123:80 weight=3; | ||
} | ||
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#虚拟主机的配置 | ||
server | ||
{ | ||
#监听端口 | ||
listen 80; | ||
#域名可以有多个,用空格隔开 | ||
server_name www.ha97.com ha97.com; | ||
index index.html index.htm index.php; | ||
root /data/www/ha97; | ||
location ~ .*\.(php|php5)?$ | ||
{ | ||
fastcgi_pass 127.0.0.1:9000; | ||
fastcgi_index index.php; | ||
include fastcgi.conf; | ||
} | ||
#图片缓存时间设置 | ||
location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$ | ||
{ | ||
expires 10d; | ||
} | ||
#JS和CSS缓存时间设置 | ||
location ~ .*\.(js|css)?$ | ||
{ | ||
expires 1h; | ||
} | ||
#日志格式设定 | ||
log_format access '$remote_addr - $remote_user [$time_local] "$request" ' | ||
'$status $body_bytes_sent "$http_referer" ' | ||
'"$http_user_agent" $http_x_forwarded_for'; | ||
#定义本虚拟主机的访问日志 | ||
access_log /var/log/nginx/ha97access.log access; | ||
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#对 "/" 启用反向代理 | ||
location / { | ||
proxy_pass http://127.0.0.1:88; | ||
proxy_redirect off; | ||
proxy_set_header X-Real-IP $remote_addr; | ||
#后端的Web服务器可以通过X-Forwarded-For获取用户真实IP | ||
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; | ||
#以下是一些反向代理的配置,可选。 | ||
proxy_set_header Host $host; | ||
client_max_body_size 10m; #允许客户端请求的最大单文件字节数 | ||
client_body_buffer_size 128k; #缓冲区代理缓冲用户端请求的最大字节数, | ||
proxy_connect_timeout 90; #nginx跟后端服务器连接超时时间(代理连接超时) | ||
proxy_send_timeout 90; #后端服务器数据回传时间(代理发送超时) | ||
proxy_read_timeout 90; #连接成功后,后端服务器响应时间(代理接收超时) | ||
proxy_buffer_size 4k; #设置代理服务器(nginx)保存用户头信息的缓冲区大小 | ||
proxy_buffers 4 32k; #proxy_buffers缓冲区,网页平均在32k以下的设置 | ||
proxy_busy_buffers_size 64k; #高负荷下缓冲大小(proxy_buffers*2) | ||
proxy_temp_file_write_size 64k; | ||
#设定缓存文件夹大小,大于这个值,将从upstream服务器传 | ||
} | ||
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#设定查看Nginx状态的地址 | ||
location /NginxStatus { | ||
stub_status on; | ||
access_log on; | ||
auth_basic "NginxStatus"; | ||
auth_basic_user_file conf/htpasswd; | ||
#htpasswd文件的内容可以用apache提供的htpasswd工具来产生。 | ||
} | ||
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#本地动静分离反向代理配置 | ||
#所有jsp的页面均交由tomcat或resin处理 | ||
location ~ .(jsp|jspx|do)?$ { | ||
proxy_set_header Host $host; | ||
proxy_set_header X-Real-IP $remote_addr; | ||
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; | ||
proxy_pass http://127.0.0.1:8080; | ||
} | ||
#所有静态文件由nginx直接读取不经过tomcat或resin | ||
location ~ .*.(htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma)$ | ||
{ expires 15d; } | ||
location ~ .*.(js|css)?$ | ||
{ expires 1h; } | ||
} | ||
} | ||
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``` |
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