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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">3022</span></span>  </p> </article><article class="excerpt"> <header> <a title="DB2" class="label label-important zj-del-target" href="/category/48">DB2<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7349" title="DB2事务日志" target="_blank" onclick="return recordId('',)">DB2事务日志 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7349" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/3.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7349';}else{window.open('/article/7349');}" style="cursor: pointer;">1、DB2数据库的日志原理事务日志记录数据库中所有对象和数据的改变，在早前版本中最大可达256G，其大小为(logprimary+logsecond)*logfilsiz，其中logprimary+logsecond的值小于或等于256，logfilsiz的最大为262144，在9.5版本中，日志最大已经可以达到512G，其中logfilsz的大小更改为524286。DB2数据库的日志分为主日志和辅助日志，其中主日志在第一个连接到达数据库或者数据库被激活后</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 01:54:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3021</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/30436" title="C/C++/Qt与 Python 混合编程(3)：Qt 调用嵌入python" target="_blank" onclick="return recordId('',)">C/C++/Qt与 Python 混合编程(3)：Qt 调用嵌入python </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30436" 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/30436';}else{window.open('/article/30436');}" style="cursor: pointer;">1.参数传递参数传递的意思就是将C的值传递给py的函数，然后进行计算输出。将数据值从C转换为Python，使用转换后的值对Python接口例程执行函数调用将数据值从Python调用转换为C。2.例子第二个程序的目标是在Python脚本中执行一个函数，现在这里需要传递参数。与关于非常高级接口的部分一样，Python解释器并不直接与应用程序交互(但这将在下一节中进行更改)。运行Python脚本中定义的函数的代码是:#definePY_SSIZE_T_CLEAN</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 17:56:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3020</span></span>  </p> </article><article class="excerpt"> <header> <a title="Ubuntu" class="label label-important zj-del-target" href="/category/55">Ubuntu<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/21553" title="how to install jdk on ubuntu" target="_blank" onclick="return recordId('',)">how to install jdk on ubuntu </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/21553" 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/21553';}else{window.open('/article/21553');}" style="cursor: pointer;">apt-getinstallsun-java6-jdksun-java6-jre有点习惯于用命令行安装的方式了，省得去网上找页面下载，还要找迅雷下什么的，配上好的源挺省事的不过配置环境变量还是熟悉，费了些功夫，PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"LANG="zh_CN.UTF-8"LANGUAGE="zh_CN:zh:en_US:en"C</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 23:46:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3020</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/15531" title="iOS App的图标，启动画面及其它" target="_blank" onclick="return recordId('',)">iOS App的图标，启动画面及其它 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15531" 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/15531';}else{window.open('/article/15531');}" style="cursor: pointer;">注意：最新的图标尺寸和文件名规格以Apple的文档为准：TechnicalQ&AQA1686:AppIconsoniPadandiPhone。其中要注意，iTunesArtWork这项不用写入Info.plist的Iconfiles。这点Apple的文档加粗说明了。图标的圆角和光晕效果圆角效果。图标的圆角效果是系统自动加上的，我们不能控制。这也是为什么我们看到的每个图标，其圆角效果是完全相同的。光晕效果。光晕效果也是系统加上的，和“圆角”不同的是，光晕效果</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 22:29:50</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3020</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/9805" title="C#操作Word完全功略！" target="_blank" onclick="return recordId('',)">C#操作Word完全功略！ </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9805" 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/9805';}else{window.open('/article/9805');}" style="cursor: pointer;">【摘自】http://tmsoft.lsxy.com/trackback.php?tbID=334&extra=2aa67d周老师科研站前提：导入COM库：Microsoftword11.0ObjectLibrary.引用里面就增加了：创建新WordobjectoMissing=System.Reflection.Missing.Value;Word._ApplicationoWord;Word._DocumentoDoc;oWord=newWord.Ap</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 09:27:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3020</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/4580" title="JavaScript 语言基础知识点总结（思维导图）" target="_blank" onclick="return recordId('',)">JavaScript 语言基础知识点总结（思维导图） </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/4580" 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/4580';}else{window.open('/article/4580');}" style="cursor: pointer;">JavaScript数组JavaScript函数基础Javascript运算符JavaScript流程控制JavaScript正则表达式JavaScript字符串函数JavaScript数据类型JavaScript变量Window对象DOM基本操作JavaScript语言基础知识点总结（思维导图）</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 01:33:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3020</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/autocomplete/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/autocomplete/1/p/193">上一页</a></li> <li><a href="/search/autocomplete/1/p/192">192</a></li><li><a href="/search/autocomplete/1/p/193">193</a></li><li class="active"><span>194</span></li><li><a href="/search/autocomplete/1/p/195">195</a></li><li><a href="/search/autocomplete/1/p/196">196</a></li> <li class="next-page"><a href="/search/autocomplete/1/p/195">下一页</a></li> <li><a href="/search/autocomplete/1/p/2923">末页</a></li> <li><span>共 2923页,共29230条</span></li> </ul> </div> </div> </div>   <style type="text/css"> .d_postlist .text 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