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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">3607</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/18.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">3607</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('',)">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/6.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="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/10496" title="Libevent（1）— 简介、编译、配置" target="_blank" onclick="return recordId('',)">Libevent（1）— 简介、编译、配置 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10496" 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/10496';}else{window.open('/article/10496');}" style="cursor: pointer;">转自：http://name5566.com/4190.html参考文献列表：http://www.wangafu.net/~nickm/libevent-book/此文编写的时候，使用到的Libevent为2.0.21Libevent之跨平台在处理大量SOCKET连接时，使用select并不高效。各个系统都提供了处理大量SOCKET连接时的解决方案：Linux下的epoll()BSD下的kqueue()Solaris下的evportsWindows下的I</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 09:27:28</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3607</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('',)">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/12.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">3606</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('',)">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/20.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">3606</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9868" title="selenium2（WebDriver）环境搭建" target="_blank" onclick="return recordId('',)">selenium2（WebDriver）环境搭建 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9868" 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/9868';}else{window.open('/article/9868');}" style="cursor: pointer;">1、安装jdk并配置环境变量：jdk安装jdk下载地址：http://www.oracle.com/technetwork/java/javase/downloads/index.html环境变量配置，如：CLASSPATH=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jarJAVA_HOME=D:\ProgramFiles\Java\jdk1.6.0_10PATH=%JAVA_HOME%\bin2、安装F</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 09:27:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3606</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6635" title="export.py" target="_blank" onclick="return recordId('',)">export.py </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6635" 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/6635';}else{window.open('/article/6635');}" style="cursor: pointer;">#!/usr/bin/envpython#encoding=utf-8importredis,codecs,sys,time,datetime,doctest,rereload(sys)sys.setdefaultencoding('utf8')classUnbuffered:def__init__(self,stream):self.stream=streamdefwrite(self,data):self.stream.write(data)self.</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 01:53:20</span></span> <span class="muted"><i class="fa 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