Home Web Front-end HTML Tutorial 一次WEB前端优化尝试 - jerrylsxu

一次WEB前端优化尝试 - jerrylsxu

May 20, 2016 pm 01:48 PM

今天对自己做的项目中的一个设计器界面加载速度上进行了优化,因为页面在加载的时候,感觉有点慢。首先,我用firefox的yslow和chrome的pagespeed进行了测试,效果如下,分数有点不同,但是都是很低的。我其实主要在chrome下用pagespeed的提示进行优化的。

yslow优化前:

         

yslow优化后:

 

pagespeed优化前:

 

pagespeed优化后:

 

优化策略:

          1.tomcat配置启用gzip压缩  

          2.tomcat配置静态文件的过期时间

          3.css放页面上方

          4.javascript放页面下方

          5.css和js文件分别合并、压缩

 

tomcat启用gzip压缩

 

打开tomcat的conf目录下的server.xml文件,修改如下

 

  1. Connector port="80" protocol="HTTP/1.1"   
  2.            connectionTimeout="20000"   
  3.            redirectPort="8443" executor="tomcatThreadPool" URIEncoding="utf-8"   
  4.                        compression="on"   
  5.                        compressionMinSize="50" noCompressionUserAgents="gozilla, traviata"   
  6.                        compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain" />  

 参考链接:http://blog.csdn.net/hbcui1984/article/details/5666327

 

 

tomcat配置静态文件过期时间

 

打开tomcat的conf目录下的web.xml文件,增加如下:

  1. filter>  
  2.        filter-name>ExpiresFilterfilter-name>  
  3.        filter-class>org.apache.catalina.filters.ExpiresFilterfilter-class>  
  4.        init-param>  
  5.           param-name>ExpiresByType imageparam-name>  
  6.           param-value>access plus 10 minutesparam-value>  
  7.        init-param>  
  8.        init-param>  
  9.           param-name>ExpiresByType text/cssparam-name>  
  10.           param-value>access plus 10 minutesparam-value>  
  11.        init-param>  
  12.        init-param>  
  13.           param-name>ExpiresByType application/javascriptparam-name>  
  14.           param-value>access plus 10 minutesparam-value>  
  15.        init-param>  
  16.     filter>  
  17.     filter-mapping>  
  18.        filter-name>ExpiresFilterfilter-name>  
  19.        url-pattern>/*url-pattern>  
  20.        dispatcher>REQUESTdispatcher>  
  21.     filter-mapping>  

过期时间:每次请求增加十分钟 

参考链接:https://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/catalina/filters/ExpiresFilter.html

 

css文件合并压缩,js文件合并压缩

 

合并压缩使用grunt进行处理,简单方便

 

参考链接:http://www.cnblogs.com/snandy/archive/2013/03/11/2949177.html

http://www.cnblogs.com/snandy/archive/2013/05/20/3088613.html

 

总体来说,页面加载速度有所提升,因页面设计器中,各个组件的js和核心js加起来有30多个,我只针对这方面进行了压缩合并,其他引入的js插件都是使用的压缩后的;css方面我也只压缩合并的我自己增加的文件。图片方面没有把所有图片都合并到一个文件中,只有少部分icon整合了,这方面合并后应该还会有所提升。

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