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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">3577</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('',)">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/8.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">3577</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('',)">【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/13.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">3575</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('',)">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/6.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">3574</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/20459" title="ASP.NET服务器控件开发（3）--事件和回传数据的" target="_blank" onclick="return recordId('',)">ASP.NET服务器控件开发（3）--事件和回传数据的 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20459" 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/20459';}else{window.open('/article/20459');}" style="cursor: pointer;">前两篇介绍了服务器控件的基本显示，属性的设定，继承Webcontrol开发控件等内容，这篇介绍下定制服务器控件的事件的处理和回传数据的处理。当ASP.NET页面处理回传到服务器端的表单时，两种信息会传递给页面中的控件：回传事件，如Button一类控件触发的回传，会引发服务器端事件；回传数据：是Web表单中包含的数据，该数据是在Web表单提交到服务器端时传递给如TextBox一类的控件。处理回传数据PostBack（回传）：ASP.NET控件提交表单到服务器</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 23:32:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3574</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('',)">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/20.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 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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">3574</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/11630" title="SWT窗口禁用最大化" target="_blank" onclick="return recordId('',)">SWT窗口禁用最大化 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11630" 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/11630';}else{window.open('/article/11630');}" style="cursor: pointer;">SWT中的窗口窗口样式Shellshell=newShell(newDisplay(),SWT.MIN);Shell类的不同样式SWT.TITLE:只显示标题栏SWT.CLOSE:只显示关闭SWT.MIN:只显示最小化和关闭SWT.MAX:只显示最大化和关闭SWT.BORDER:只显示边框SWT.RESIZE:窗口的大小可以通过鼠标手动来设定SWT.NO_TRIM:既无边框也无标题SWT.SHELL_TRIM:相当于CLOSETITLEMINMAXRESI</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">3574</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/apple/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/apple/1/p/185">上一页</a></li> <li><a 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