编程技术 - 军军小站|张军博客

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">3565</span></span>  </p> </article><article class="excerpt"> <header> <a title="redis" class="label label-important zj-del-target" href="/category/63">redis<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8201" title="redis持久化" target="_blank" onclick="return recordId('cid',30)">redis持久化 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8201" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8201';}else{window.open('/article/8201');}" style="cursor: pointer;">Redis是一种高级key-value数据库。它跟memcached类似，不过数据可以持久化，而且支持的数据类型很丰富。有字符串，链表，集合和有序集合。支持在服务器端计算集合的并，交和补集(difference)等，还支持多种排序功能。所以Redis也可以被看成是一个数据结构服务器。Redis的所有数据都是保存在内存中，然后不定期的通过异步方式保存到磁盘上(这称为“半持久化模式”)；也可以把每一次数据变化都写入到一个appendonlyfile(aof)里</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 01:54:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3565</span></span>  </p> </article><article class="excerpt"> <header> <a title="CSS" class="label label-important zj-del-target" href="/category/68">CSS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2512" title="图解div+css命名规则" target="_blank" onclick="return recordId('cid',30)">图解div+css命名规则 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2512" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/2512';}else{window.open('/article/2512');}" style="cursor: pointer;">一个好的命名习惯对一个网页制作人员来说可以提高代码修改的效率及代码的可读性，本图是彦磊根据自己的习惯整理而成，希望和大家交流，每个人的习惯不一样，不一下完全按照这样的规则来但一定要有自己的一套规则。图解div+css命名规则</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 01:32:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3565</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/13784" title="hibernate.properties及hibernate.cfg.xml" target="_blank" onclick="return recordId('cid',30)">hibernate.properties及hibernate.cfg.xml </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13784" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13784';}else{window.open('/article/13784');}" style="cursor: pointer;">hibernate.properties和hibernate.cfg.xml是hibernate的配置文件,对于初学者,可能存在一些配置疑难。本文给出了hibernate.properties及hibernate.cfg.xml内容配置样例,二者选其一即可hibernate.properties##----------thisistheconnectionandhibernate.dialectfomysql------------------------</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 22:08:01</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3564</span></span>  </p> </article><article class="excerpt"> <header> <a title="IOS" class="label label-important zj-del-target" href="/category/58">IOS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12823" title="【一步一步学IOS5 】定制UITableView表视图单" target="_blank" onclick="return recordId('cid',30)">【一步一步学IOS5 】定制UITableView表视图单 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12823" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12823';}else{window.open('/article/12823');}" style="cursor: pointer;">之前，我们已经创建了一个简单的表视图App，用来显示菜单列表和图片。下面，我们继续改进该App，是其效果更佳。1）实现不同的行显示不同的图片2)定制表视图单元格1.显示不同的缩略图：在修改代码之前，我们先回顾一下在数据行上显示缩略图的代码：-(UITableViewCell*)tableView:(UITableView*)tableViewcellForRowAtIndexPath:(NSIndexPath*)indexPath{staticNSStri</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 09:30:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3564</span></span>  </p> </article><article class="excerpt"> <header> <a title="redis" class="label label-important zj-del-target" href="/category/63">redis<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/1685" title="redis源码笔记-ae.c" target="_blank" onclick="return recordId('cid',30)">redis源码笔记-ae.c </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1685" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/2.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/1685';}else{window.open('/article/1685');}" style="cursor: pointer;">ae.c是redis事件框架的具体实现，这篇blog对这份源码进行简单说明。其中谈到了作者已经标记的一些未来可能做的改进。ae.c1#include<stdio.h>2#include<sys/time.h>3#include<sys/types.h>4#include<unistd.h>5#include<stdlib.h>67#include"ae.h"8#include"zmalloc.h"9#include"config.h"1011/*Inclu</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 01:32:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3564</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/18985" title="在ASP.NET中使用JSON" target="_blank" onclick="return recordId('cid',30)">在ASP.NET中使用JSON </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18985" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18985';}else{window.open('/article/18985');}" style="cursor: pointer;">本篇将简单的介绍一个在.NET中实现JSON的API，然后使用该API做个C/SASP.NET的小练习。Json.NET的简单介绍首先介绍一个为方便在.NET中使用JSON的API，Json.NET。它方便我们读取从浏览器流向服务器的JSON对象，也方便在响应流中写入JSON对象。这里下载：Json.NET。Json.NET只提供了服务器端的方法，主要有实现JSON文本与XML互相转换的类，有自定义读写JSON的JsonReader类和JsonWriter</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 23:13:37</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3563</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/13860" title="AChartEngine应用之LineChart（模拟动态生命特" target="_blank" onclick="return recordId('cid',30)">AChartEngine应用之LineChart（模拟动态生命特 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13860" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13860';}else{window.open('/article/13860');}" style="cursor: pointer;">AChartEngine应用之LineChart（模拟动态生命特征值图）接着上一次写的内容，构建动态曲线图，并产生与用户交互，考虑到数据都是活动的，不可能总是用静态数据，所以我下面的demo就是模拟。项目作用：模拟生命特征值图，动态显示分钟脉搏生命特征值走向每隔1000ms产生50组数据，并填充到表格中，主要使用的到是Handler+Task，因为我是用Activity显示这个表格每次产生的数据都需要快速的填充到主线程UI中，所以我就用Handler，这里</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 22:08:56</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3562</span></span>  </p> </article><article class="excerpt"> <header> <a title="IOS" class="label label-important zj-del-target" href="/category/58">IOS<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/15538" title="君正4750开发板使用日记6-uCOS(minios)的开发配" target="_blank" onclick="return recordId('cid',30)">君正4750开发板使用日记6-uCOS(minios)的开发配 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15538" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/14.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15538';}else{window.open('/article/15538');}" style="cursor: pointer;">大半年没有搞君正的开发板了，最近总算有机会再试试JZ4750的uc/osII配置。也在此做个记录，供参阅。ucos要在linux环境下编译，我仍是在windows下用VMWareUbuntuServer910虚拟机，用Putty连接登录后执行命令。我一开始并没有拿到了JZ4750的ucos的SDK（随机光盘上只有一个可烧录的DEMO），于是从君正官网的FTP里下载了Jz-uCOS-Development-guide.pdf、mipsel-4.1.2-nop</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 22:29:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3561</span></span>  </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/10367" title="C#调用WORD处理的小项目转" target="_blank" onclick="return recordId('cid',30)">C#调用WORD处理的小项目转 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10367" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/10367';}else{window.open('/article/10367');}" style="cursor: pointer;">转http://www.cnblogs.com/happygrass/archive/2009/02/13/1388224.html最近一个朋友让我帮他做一个小功能，其实就是把WORD文档里的内容存到数据库里去，可以实现搜索并转EXCEL的功能，需求很简单，想不到加上部署折腾了我一个星期，我先把需求详细描述一下：提供一个WORD文档的样板，这个WORD文档里大部分是文本，其中插入了一个EXCEL表格，WORD的内容如下：房地产价值监证确认书编号：（2009</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 09:27:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3561</span></span>  </p> </article><article class="excerpt"> <header> <a title="Python" class="label label-important zj-del-target" href="/category/44">Python<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/26239" title="Python math库 ln(x)运算的实现及原理" target="_blank" onclick="return recordId('cid',30)">Python math库 ln(x)运算的实现及原理 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/26239" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/26239';}else{window.open('/article/26239');}" style="cursor: pointer;">这个是很有用的一个运算，除了本身可以求自然对数，还是求指数函数需要用到的基础函数。实现原理就是泰勒展开，最简单是在x=1处进行泰勒展开：但该函数离1越远越难收敛，同时大于2时无法收敛，所以需要进行换元，然后重新展开：但是该换元在接近0时或者接近无穷大时收敛困难，处在1到10范围内收敛快且精度高，所以对大于10或小于1的值进行分解如下：ln(55000)=ln(5.5)+4ln10ln(0.0015)=ln(1.5)-4ln10ln10为算好的值，可直接由l</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">2019-09-27 17:50:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3560</span></span>  </p> </article><article class="excerpt"> <header> <a title="C#" class="label label-important zj-del-target" href="/category/43">C#<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20529" title="一致性Hash算法(KetamaHash)的c#实现" target="_blank" onclick="return recordId('cid',30)">一致性Hash算法(KetamaHash)的c#实现 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20529" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20529';}else{window.open('/article/20529');}" style="cursor: pointer;">最近在研究"一致性HASH算法"（ConsistentHashing），用于解决memcached集群中当服务器出现增减变动时对散列值的影响。后来在JAVAEYE上的一篇文章中，找到了其中的KetamaHash算法的JAVA实现（一种基于虚拟结点的HASH算法），于是为了加深理解，对照JAVA版本，用C#重写了一个。放到这里，如果大家感兴趣的话，可以下载测试一下，如果发现写法有问题请及时告之我，以便我及时修正。下面是对Ketama的介绍：Ketamaisa</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 23:33:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3560</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/18108" title="WebBrowser 控件概述" target="_blank" onclick="return recordId('cid',30)">WebBrowser 控件概述 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18108" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18108';}else{window.open('/article/18108');}" style="cursor: pointer;">出处:http://msdn2.microsoft.com/zh-cn/library/w290k23d(VS.80).aspx全部折叠<styletype="text/css">.vb,.cs,.cpp,.nu{display:none;}</style><styleid="LanguageSpecificTextStyle"type="text/css">.nu{display:inline;}</style>ThispageisspecifictoM</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 23:02:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3560</span></span>  </p> </article><article class="excerpt"> <header> <a title="C++" class="label label-important zj-del-target" href="/category/42">C++<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/18043" title="【译】C++ 内存池 -- C++ Memory Pool ." target="_blank" onclick="return recordId('cid',30)">【译】C++ 内存池 -- C++ Memory Pool . </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18043" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18043';}else{window.open('/article/18043');}" style="cursor: pointer;">转自：http://blog.csdn.net/060/article/details/1326025这是我翻译的文章，来自CodeProject，原文作者:DanDanger2000.原文链接:http://www.codeproject.com/cpp/MemoryPool.aspC++内存池l下载示例工程–105Kbl下载源代码–17.3Kb目录l引言l它怎样工作l示例l使用这些代码l好处l关于代码lToDol历史引言C/C++的内存分配(通过mal</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 23:01:17</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3560</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('cid',30)">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/2.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">3560</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/category/30/p/1">首页</a></li> <li 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