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">3650</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/11150" title="扩展 HTMLParser 对自定义标签的处理能力" target="_blank" onclick="return recordId('cid',30)">扩展 HTMLParser 对自定义标签的处理能力 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11150" 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/11150';}else{window.open('/article/11150');}" style="cursor: pointer;">文档选项<scripttype="text/javascript"></script>打印本页<noscript></noscript><scripttype="text/javascript"></script>将此页作为电子邮件发送<noscript></noscript> </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/6725" title="在.NET平台下使用C#通过Thrift访问Cassandra" target="_blank" onclick="return recordId('cid',30)">在.NET平台下使用C#通过Thrift访问Cassandra </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6725" 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/6725';}else{window.open('/article/6725');}" style="cursor: pointer;">几家做seo无耻公司名单http://www.byywee.comhttp://www.cosdiv.com通过在自已网站加入别人网站连接，这种网站专门对新开通的网站做连接,从而达到宣传他们目的，http://www.renrenaj.com/about/copyright.html1、下载Thrift两个文件:thrift-0.7.0.tar.gzThriftcompilerforWindows2、获取Thrift.dll解压后，找到源代码：thrift</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 01:53:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3650</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/2013" title="CodeSmith学习笔记(二)：操作数据库" target="_blank" onclick="return recordId('cid',30)">CodeSmith学习笔记(二)：操作数据库 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2013" 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/2013';}else{window.open('/article/2013');}" style="cursor: pointer;">1.打开SchemaExploer配置数据库连接，定义表属性的Type为SchemaExplorer.TableSchema,数据库属性Type为SchemaExplorer.DatabaseSchema.2.定义内部的方法，下面调用用到的3.循环表的非主键4.定义输出到文件，枚举类型（头部定义属性时用到），常量。5.选择属性6.运行，结果如下CodeSmith学习笔记(二)：操作数据库</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 01:32:44</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3650</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/18.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">3650</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/19800" title="UML" target="_blank" onclick="return recordId('cid',30)">UML </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19800" 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/19800';}else{window.open('/article/19800');}" style="cursor: pointer;">爱因斯坦曾说过，我们生活在四维空间（xyz在加一条时间t，就是四维了）内。也就是说我们所看到的事物是一个个立体状的模型。抽象地说我们的生活是由一幅幅图组成的，每一时刻对应着一幅图。形象的说我们的眼睛所看到的是生活中的一个个场景，一个个场景组成了一幅图，一幅幅图成为了世界的投影。这些场景是如何组成的呢？其实很简单，场景是由事物和关系组成，如：人、手机、书、电脑等，把这些事物连接到一起记录下来不就组成图了吗。在生活中我们常常用相机或摄影机将图记录下来，这就是我</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 23:24:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3649</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/18145" title="使用工具安装，运行，停止，卸载Window服务" target="_blank" onclick="return recordId('cid',30)">使用工具安装，运行，停止，卸载Window服务 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18145" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18145';}else{window.open('/article/18145');}" style="cursor: pointer;">WSWinForm.exe介绍WSWinForm.exe是我自己开发的一个实用的小工具，用于将任何EXE程序作为Windows服务运行。也就是说WSWinForm只是其注册程序的服务外壳，这个特性对于我们来说非常实用，我们可以通过它来安装，运行，停止，卸载Windows服务，而不再是通过命令行InstallUtil的方式来安装。资源下载你可以通过本文下载。应用程序源代码如何使用下载完软件以后，我们能干些什么呢？看看这个截图吧：。这里可以看到的操作：1.安装</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 23:02:36</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3649</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/15.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">3649</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/12182" title="使用FFMPEG SDK解码流数据获得YUV数据及其大小" target="_blank" onclick="return recordId('cid',30)">使用FFMPEG SDK解码流数据获得YUV数据及其大小 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12182" 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/12182';}else{window.open('/article/12182');}" style="cursor: pointer;">本文以H264视频流为例，讲解解码流数据的步骤。为突出重点，本文只专注于讨论解码视频流数据，不涉及其它（如开发环境的配置等）。如果您需要这方面的信息，请和我联系。准备变量定义AVCodecContext。如果您使用类，可以定义成类成员。我这里定义成全局变量。staticAVCodecContext*g_pCodecCtx=NULL;定义一个AVFrame，AVFrame描述一个多媒体帧。解码后的数据将被放在其中。staticAVFrame*g_pavfFr</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 09:30:12</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3648</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/16140" title="C++转向C#的疑惑：难道C#中没有拷贝构造函数？" target="_blank" onclick="return recordId('cid',30)">C++转向C#的疑惑：难道C#中没有拷贝构造函数？ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16140" 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/16140';}else{window.open('/article/16140');}" style="cursor: pointer;">不可否认，C++在过去十年乃至现在一直都是windows平台上的主流开发语言，而来势凶猛的.NET势必开辟一个崭新的局面，从目前的种种迹象来看，.NET是大势所趋，而C#作为.NET平台上的第一开发语言自然备受关注，于是有很多程序员纷纷转向C#，这其中当然不乏C++程序员。情况往往是这样，从一种语言过渡到另一种语言，哪怕是比较相似的语言，程序员也经常无意识地陷入原开发语言的思维定势，这样的结果通常只有一个，那就是导致连程序员自己也始终想不通的错误。本文由某</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 22:37:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3647</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/11691" title="Ext.ux.UploadDialog.Dialog Ext上传" target="_blank" onclick="return recordId('cid',30)">Ext.ux.UploadDialog.Dialog Ext上传 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11691" 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/11691';}else{window.open('/article/11691');}" style="cursor: pointer;">今天做项目做了个上传的功能，不过遇到好多问题，先在这做个笔记。。。。先引入Java代码<linkrel="stylesheet"type="text/css"href="<%=path%>/css/ext-all.css"/><scripttype="text/javascript"src="<%=path%>/js/ext-base.js"></script><scripttype="t</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 09:29:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3647</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/995" title="跟我学系列教程——《13天让你学会Redis》火热" target="_blank" onclick="return recordId('cid',30)">跟我学系列教程——《13天让你学会Redis》火热 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/995" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/995';}else{window.open('/article/995');}" style="cursor: pointer;">学习目标每天2小时，13天让你学会Redis。本课程针对Redis新手，甚至连Redis是什么都没有听说过的同学。课程会具体介绍Redis是什么以及为什么要使用Redis，结合项目实践旨在让学生从零開始逐步晋升为一个Redis的优秀开发人员。适合人群1.在校学生：掌握多门存储技术，丰富毕业设计，贴近企业新技术2.在职开发：技术储备，提高晋升空间。报名链接点击报名跟我学系列教程——《13天让你学会Redis》火热报名中</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 01:32:21</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3647</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/30299" title="递推最小二乘法——python程序" target="_blank" onclick="return recordId('cid',30)">递推最小二乘法——python程序 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30299" 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/30299';}else{window.open('/article/30299');}" style="cursor: pointer;">算法引用的数据为python自带的波士顿房价数据。代码如下：#data第一列为标记值#data后几列为特征向量#initialTheta为需要求得的thetaimportnumpyasnpimportsklearn.datasetsfromsklearn.model_selectionimporttrain_test_splitfromsklearn.metricsimportmean_squared_errorimportmatplotlibasmpli</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 17:56:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3646</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/20294" title="浅析C++中虚函数的调用及对象的内部布局" target="_blank" onclick="return recordId('cid',30)">浅析C++中虚函数的调用及对象的内部布局 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20294" 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/20294';}else{window.open('/article/20294');}" style="cursor: pointer;">在我那篇《浅析C++中的this指针》中，我通过分析C++代码编译后生成的汇编代码来分析this指针的实现方法。这次我依然用分析C++代码编译后生成的汇编代码来说明C++中虚函数调用的实现方法，顺便也说明一下C++中的对象内部布局。下面所有的汇编代码都是用VC2005编译出来的。虽然，不同的编译器可能会编译出不同的结果，对象的内部布局也不尽相同；但是，只要是符合C++标准的编译器，编译结果和对象的内部布局应该是大同小异。首先，是一个有着简单继承关系的两个类</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 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