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CSS

详解css中用clip剪切图片的原理和方法

clip剪切图片示意图假设原图片的宽度高度500×375（px）

系统 2019-08-29 22:55:34 3387

C++

前言C++中的虚函数的作用主要是实现了多态的机制。关于多态，简而言之就是用父类型别的指针指向其子类的实例，然后通过父类的指针调用实际子类的成员函数。这种技术可以让父类的指针有“多种形态”，这是一种泛型技术。所谓泛型技术，说白了就是试图使用不变的代码来实现可变的算法。比如：模板技术，RTTI技术，虚函数技术，要么是试图做到在编译时决议，要么试图做到运行时决议。关于虚函数的使用方法，我在这里不做过多的阐述。大家可以看看相关的C++的书籍。在这篇文章中，我只想从

系统 2019-08-29 23:23:28 3386

ASP.NET

ASP.NET会话（Session）保存模式

出处：http://blog.csdn.net/cityhunter172/article/details/727743今日抽空就说一下Session在.Netv1.0/v1.1中的存储模式。大家可在MSDN2003中搜索一下即可看到关于Web.config中的节点元素的描述，共有Off、InProc、StateServer、SQLServer四种模式。Off、InProc分别指“不启用”、“进程内保

系统 2019-08-29 23:19:55 3386

Hive

hive实战 - qiang.xu - 博客园

hive实战-qiang.xu-博客园hive实战1.安装hive2.hive实战3.hive存储模型4.深入hql查询语言5.参考资料及代码下载<1>.安装hive下载hive，下载地址http://mirror.bjtu.edu.cn/apache//hive/，解压该文件：xuqiang@ubuntu:~/hadoop/src/hive$tarzxvfhive-0.7.0-bin.tar.gz设置环境变量：xuqiang@ubuntu:~/hadoo

系统 2019-08-12 01:32:58 3386

数据库相关

binlog的几种复制形式

binlog的几种复制形式MySQL5.5中对于二进制日志(binlog)有3种不同的格式可选：Mixed,Statement,Row，默认格式是Statement。总结一下这三种格式日志的优缺点。MySQLReplication复制可以是基于一条语句(StatementLevel)，也可以是基于一条记录(RowLevel)，可以在MySQL的配置参数中设定这个复制级别，不同复制级别的设置会影响到Master端的bin-log日志格式。1.Row日志中会记

系统 2019-08-12 01:54:32 3385

编程技术

VMnet桥接本地地址上网设置方法

VMnet桥接本地地址上网设置方法上次我们看了在禁用vmnet1和vmnet8的情况下,使用桥接方式上网的方法,这次我们看下使用真实主机中的网卡和vmnet1桥接上网的方式1.首先我们的真实主机可以用本地连接正常接入网络2.选中真实主机中的本地网卡和vmnet1,右键,然后选择桥接3.桥接成功以后,我们可以看到现在多了一个网络桥4.在这,桥接的时候一定要注意,确保在真实主机中的本地连接属性窗口中,vmwarebridgeprotocol协议属性中的数字为1

系统 2019-08-29 23:25:40 3384

Javascript

JavaScript 的性能优化：加载和执行

概览无论当前JavaScript代码是内嵌还是在外链文件中，页面的下载和渲染都必须停下来等待脚本执行完成。JavaScript执行过程耗时越久，浏览器等待响应用户输入的时间就越长。浏览器在下载和执行脚本时出现阻塞的原因在于，脚本可能会改变页面或JavaScript的命名空间，它们对后面页面内容造成影响。一个典型的例子就是在页面中使用document.write()。例如清单1清单1JavaScript代码内嵌示例Sou</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:50:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3384</span></span>  </p> </article><article class="excerpt"> <header> <a title="Hadoop" class="label label-important zj-del-target" href="/category/60">Hadoop<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11775" title="Hadoop 的 TotalOrderPartitioner" target="_blank" onclick="return recordId('',)">Hadoop 的 TotalOrderPartitioner </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11775" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11775';}else{window.open('/article/11775');}" style="cursor: pointer;">http://blog.oddfoo.net/2011/04/17/mapreduce-partition%E5%88%86%E6%9E%90-2/Partition所处的位置Partition位置Partition主要作用就是将map的结果发送到相应的reduce。这就对partition有两个要求：1）均衡负载，尽量的将工作均匀的分配给不同的reduce。2）效率，分配速度一定要快。Mapreduce提供的PartitionerMapreduce默认的</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3384</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11644" title="Openmeetings安装详细步骤" target="_blank" onclick="return recordId('',)">Openmeetings安装详细步骤 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11644" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/7.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11644';}else{window.open('/article/11644');}" style="cursor: pointer;">Openmeetings安装Openmeetings安装Openmeetings官方主页http://code.google.com/p/openmeetings/。安装过程参照http://code.google.com/p/openmeetings/wiki/InstallationOfRelease05http://code.google.com/p/openmeetings/wiki/BuildSourcesOpenmeetings是一个网络视频会</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:29:52</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3384</span></span>  </p> </article><article class="excerpt"> <header> <a title="PHP" class="label label-important zj-del-target" href="/category/64">PHP<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2388" title="PHP环境出现时区问题" target="_blank" onclick="return recordId('',)">PHP环境出现时区问题 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2388" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/3.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/2388';}else{window.open('/article/2388');}" style="cursor: pointer;">如下图所示，php执行的时候出现如下提示：解决办法：重新设置php编译的时区。具体方法如下：1.找到php.ini文件；2.修改php.ini文件中的date.timezone的值，将其设置为"Asia/Chongqing"或者"Asia/Shanghai"；3.重新启动web服务器；PHP环境出现时区问题</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 01:32:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3384</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/cluster/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/cluster/1/p/190">上一页</a></li> <li><a href="/search/cluster/1/p/189">189</a></li><li><a href="/search/cluster/1/p/190">190</a></li><li class="active"><span>191</span></li><li><a href="/search/cluster/1/p/192">192</a></li><li><a href="/search/cluster/1/p/193">193</a></li> <li class="next-page"><a href="/search/cluster/1/p/192">下一页</a></li> <li><a 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