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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">3625</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/13.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">3625</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('',)">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/8.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">3625</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/22160" title="轻量级B/S应用开发引擎：NoahWeb" target="_blank" onclick="return recordId('',)">轻量级B/S应用开发引擎：NoahWeb </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/22160" 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/22160';}else{window.open('/article/22160');}" style="cursor: pointer;">同事介绍，说一款BS开发引擎比较强大，处理表单之类的比较不错，今天找来看看。网址：http://www.noahweb.net/帮助：http://docs.noahweb.net/看看他们网站上怎么介绍的：//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////</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">2019-08-29 23:54:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3624</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 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">3624</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/6.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 fa-eye"></i><span class="zj-icon-text">3624</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/15.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">3623</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/18505" title="XML文件DTD路径解析问题（in Eclipse）" target="_blank" onclick="return recordId('',)">XML文件DTD路径解析问题（in Eclipse） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/18505" 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/18505';}else{window.open('/article/18505');}" style="cursor: pointer;">原文出自：http://51dev.com/program/java/1/20070818/10971.html1、xml文件声明dtd文件路径如下：字串7"http://java.sun.com/dtd/ejb-jar_2_0.dtd"><ejb-jar><br>。。。。。。<br></ejb-jar>2、dtd声明解析原则：字串4DOCTYPE声明不仅包含常规关键字和根元素名称，而且包含指示外部DTD源关键字和DTD位置。XML规范定义了几种声明源方法</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 23:07:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3623</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/ztree/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/ztree/1/p/185">上一页</a></li> <li><a href="/search/ztree/1/p/184">184</a></li><li><a href="/search/ztree/1/p/185">185</a></li><li class="active"><span>186</span></li><li><a href="/search/ztree/1/p/187">187</a></li><li><a href="/search/ztree/1/p/188">188</a></li> <li class="next-page"><a 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