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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">3007</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/4.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">3007</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/13.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">3007</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/4126" title="Javascript图像处理——图像金字塔" target="_blank" onclick="return recordId('',)">Javascript图像处理——图像金字塔 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/4126" 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/4126';}else{window.open('/article/4126');}" style="cursor: pointer;">前言上一篇文章，我们讲解了边缘梯度计算函数，这篇文章我们来了解图像金字塔。图像金字塔？图像金字塔被广泛用于计算机视觉应用中。图像金字塔是一个图像集合，集合中所有的图像都源于同一个原始图像，而且是通过对原始图像连续降采样获得的。——《学习OpenCV》常见的图像金字塔有下面两种：高斯金字塔(Gaussianpyramid):用来向下采样拉普拉斯金字塔(Laplacianpyramid):用来从金字塔低层图像重建上层未采样图像高斯金字塔类似金字塔一样，高斯金字</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 01:33:37</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3007</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/31158" title="Python3之paramiko模块" target="_blank" onclick="return recordId('',)">Python3之paramiko模块 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/31158" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/17.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/31158';}else{window.open('/article/31158');}" style="cursor: pointer;">原文链接：https://www.cnblogs.com/wang-yc/p/5628114.htmlPython3之paramiko模块一.简介paramiko是一个基于SSH用于连接远程服务器并执行相关操作（SSHClient和SFTPClinet,即一个是远程连接，一个是上传下载服务），使用该模块可以对远程服务器进行命令或文件操作，值得一说的是，fabric和ansible内部的远程管理就是使用的paramiko来现实。二.使用1.下载安装pycry</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 17:57:41</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3006</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/18.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">3006</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/16957" title="使用纯javascript通过className来获取元素（ge" target="_blank" onclick="return recordId('',)">使用纯javascript通过className来获取元素（ge </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16957" 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/16957';}else{window.open('/article/16957');}" style="cursor: pointer;">MarkFinklesuggestedthatIdosomespeedtesting,nowthatanativeimplementationofgetElementsByClassNamehaslandedintheMozillatrunk(destinedforFirefox3).SoIwentaroundanddugupallofthedifferent,existing,implementationsthatIcouldfind.Currently</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 22:47:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3006</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/14139" title="Mac OS X:远程执行osascript命令" target="_blank" onclick="return recordId('',)">Mac OS X:远程执行osascript命令 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14139" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14139';}else{window.open('/article/14139');}" style="cursor: pointer;">MacOSX:远程执行osascript命令及问题解决对于系统管理/电脑维护人员，在ApplrRemoteDesktop的管理机上可以通过图形方式远程控制网络上的每台Mac电脑,而很多时候需要发送Unix命令来完成工作。比如有时需要使用管理员帐户远程登录到每台电脑，大家普遍知道的命令是：osascript-e'tellapplication"SystemEvents"'-e'keystroke"LOGIN_NAME"'-e'keystroketab'-e'</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 22:12:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3006</span></span>  </p> </article><article class="excerpt"> <header> <a title="PHP" class="label label-important zj-del-target" href="/category/64">PHP<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11562" title="Zend Framework中文化团队新站点开通--PHPEye.c" target="_blank" onclick="return recordId('',)">Zend Framework中文化团队新站点开通--PHPEye.c </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11562" 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/11562';}else{window.open('/article/11562');}" style="cursor: pointer;"><iframealign="top"marginwidth="0"marginheight="0"src="http://www.zealware.com/46860.html"frameborder="0"width="468"scrolling="no"height="60"></iframe>开通了一个新站点http://www.phpeye.com。现在正考虑用什么方式来组织，wiki还是CMS？最好要有一定互动性。前期主要用来推广ZendFram</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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