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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">3299</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/737" title="vim——vim配置步骤" target="_blank" onclick="return recordId('',)">vim——vim配置步骤 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/737" 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/737';}else{window.open('/article/737');}" style="cursor: pointer;">1.直接到githubhttps://github.com/lucasysfeng/k-vim依照README.md步骤配置。2.注意gitclone的地址为https://github.com/lucasysfeng/k-vim.git配置步骤clone到本地,配置到linux个人目录（如果是从linux_config过来的，不需要clone）gitclonehttps://github.com/lucasysfeng/k-vim.git安装依赖包#ub</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 01:32:13</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3298</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/31143" title="Python：实现计划任务和打包程序" target="_blank" onclick="return recordId('',)">Python：实现计划任务和打包程序 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/31143" 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/31143';}else{window.open('/article/31143');}" style="cursor: pointer;">Python==3.7.x有两种方式实现计划任务:scheduleAPscheduler打包python程序定时器:scheduleimportscheduleimporttime,datetimedeftask(name):print("{0}".format(name))#每隔2秒执行一次任务schedule.every(2).seconds.do(task,name)#每隔一小时执行一次任务schedule.every().hour.do(task,</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 17:57:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3297</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/29566" title="[Python知识图谱] 三.Jieba工具中文分词、添加自定义词典及词性标注" target="_blank" onclick="return recordId('',)">[Python知识图谱] 三.Jieba工具中文分词、添加自定义词典及词性标注 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/29566" 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/29566';}else{window.open('/article/29566');}" style="cursor: pointer;">本系列文章主要结合Python语言实现知识图谱构建相关工程，具有一定创新性和实用性，非常希望各位博友交流讨论，相互促进成长。前面两篇文章详细讲解了哈工大Pyltp工具，包括中文分词、词性标注、实体识别、依存句法分析和语义角色标注等。但是其中文分词效果不是很理想，如“贵州财经大学”总是切分成“贵州”、“财经”和“大学”，这是因为词典中这些词的权重较高。这篇文章主要介绍最经典的自然语言处理工具之一——Jieba，包括中文分词、添加自定义词典及词性标注等内容。知</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 17:55:18</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3297</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/11068" title="(IBM)最大限度利用 JavaScript 和 Ajax 性能" target="_blank" onclick="return recordId('',)">(IBM)最大限度利用 JavaScript 和 Ajax 性能 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11068" 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/11068';}else{window.open('/article/11068');}" style="cursor: pointer;">简介在web早期，优化web页面的性能通常意味着避免了使用不必要的HTML标记，将JavaScript代码量控制到最小，并尽量减小所有图片文件大小，否则上网冲浪者会走开去泡杯咖啡来等待页面加载。web各个方面的改进也意味着我们现在面临新的性能考虑。尽管DSL和宽带为很多人提供了对Internet上更多内容的高速访问，我们对加载时间和响应的期望也在发展，希望在页面上执行操作后能立刻得到结果。AsynchronousJavaScriptandXML(Ajax)</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 09:29:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3297</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/9677" title="[RK_2014_0920]ubuntu下，使用ldconfig解决：er" target="_blank" onclick="return recordId('',)">[RK_2014_0920]ubuntu下，使用ldconfig解决：er </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9677" 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/9677';}else{window.open('/article/9677');}" style="cursor: pointer;">一、问题描述编写一个与libpcap有关的程序：test_libpcap.cpp，编译test_libpcap.o成功。注：之前已经成功安装libpcap，libpcap.so.1.5.3的路径是：/home/test/work/lib；test_libpcap.cpp的路径是/home/test/work/test_libpcap。运行test_libpcap.o出现以下提示：test_libpcap.o:errorwhileloadingsharedl</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 09:27:01</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3297</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/10.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">3297</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/30065" title="python高斯分布概率密度函数的使用详解" target="_blank" onclick="return recordId('',)">python高斯分布概率密度函数的使用详解 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30065" 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/30065';}else{window.open('/article/30065');}" style="cursor: pointer;">如下所示：importmatplotlib.pyplotaspltimportnumpyasnpfromscipyimportstatsfrommatplotlibimportstylestyle.use('fivethirtyeight')mu_params=[-1,0,1]sd_params=[0.5,1,1.5]x=np.linspace(-7,7,100)f,ax=plt.subplots(len(mu_params),len(sd_params)</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 17:56:00</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3296</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/nginx/1/p/1">首页</a></li> <li class="prev-page"><a 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