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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">3447</span></span>  </p> </article><article class="excerpt"> <header> <a title="Java" class="label label-important zj-del-target" href="/category/41">Java<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/11520" title="Java中运行时内存结构补充" target="_blank" onclick="return recordId('cid',30)">Java中运行时内存结构补充 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11520" 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/11520';}else{window.open('/article/11520');}" style="cursor: pointer;">Java中运行时内存结构<wbr><wbr></wbr></wbr>1.1方法区：<wbr></wbr>方法区是系统分配的一个内存逻辑区域，是JVM在装载类文件时，用于存储类型信息的(类的描述信息)。<wbr></wbr>方法区存放的信息包括：<wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr>1.1.1类的基本信息：每个类的全限定名每个类的直接超类的全限定名(可约束类型转换)</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 09:29:48</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3446</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/30347" title="python 将列表中的字符串转为数字" target="_blank" onclick="return recordId('cid',30)">python 将列表中的字符串转为数字 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30347" 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/30347';}else{window.open('/article/30347');}" style="cursor: pointer;">python将列表中的字符串转为数字转自：https://www.jb51.net/article/86561.htm本文实例讲述了Python中列表元素转为数字的方法。分享给大家供大家参考，具体如下：有一个数字字符的列表：1numbers=['1','5','10','8']想要把每个元素转换为数字：1numbers=[1,5,10,8]用一个循环来解决：1234new_numbers=[];forninnumbers:new_numbers.appen</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 17:56:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/20459" title="ASP.NET服务器控件开发（3）--事件和回传数据的" target="_blank" onclick="return recordId('cid',30)">ASP.NET服务器控件开发（3）--事件和回传数据的 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20459" 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/20459';}else{window.open('/article/20459');}" style="cursor: pointer;">前两篇介绍了服务器控件的基本显示，属性的设定，继承Webcontrol开发控件等内容，这篇介绍下定制服务器控件的事件的处理和回传数据的处理。当ASP.NET页面处理回传到服务器端的表单时，两种信息会传递给页面中的控件：回传事件，如Button一类控件触发的回传，会引发服务器端事件；回传数据：是Web表单中包含的数据，该数据是在Web表单提交到服务器端时传递给如TextBox一类的控件。处理回传数据PostBack（回传）：ASP.NET控件提交表单到服务器</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 23:32:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14933" title="【Android 开发教程】保存到外部存储设备（SD卡" target="_blank" onclick="return recordId('cid',30)">【Android 开发教程】保存到外部存储设备（SD卡 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14933" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14933';}else{window.open('/article/14933');}" style="cursor: pointer;">本章节翻译自《Beginning-Android-4-Application-Development》，如有翻译不当的地方，敬请指出。原书购买地址http://www.amazon.com/Beginning-Android-4-Application-Development/dp/1118199545/上一节介绍了如何把文件存储到内部设备。有的时候，需要把文件存储到外部存储设备，比如SD卡。因为SD卡具有更大的存储空间，同时也可以很容易的和其他用户分享这</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 22:22:02</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</span></span>  </p> </article><article class="excerpt"> <header> <a title="redis" class="label label-important zj-del-target" href="/category/63">redis<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/5111" title="[预告] [3月8日] 《Redis 设计与实现》" target="_blank" onclick="return recordId('cid',30)">[预告] [3月8日] 《Redis 设计与实现》 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5111" 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/5111';}else{window.open('/article/5111');}" style="cursor: pointer;">[预告][3月8日]《Redis设计与实现》[预告][3月8日]《Redis设计与实现》2013-02-2810:36:27自从开始在博客断断续续地写一些Redis的源码分析文章以来，我一直有这样一个打算：不是间隔地、分多次地写多篇Redis的源码分析文章，而是抽出一段时间，对Redis的源码做一次完整的分析，并将其中的关键点、以及有趣的部分记录下来，集结成一个文档（或者更通俗地说，一本书？）。我在2012年12月开始将“Redis源码书”的这个想法付诸实</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 01:51:33</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</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/1687" title="InnoSetup使用笔记" target="_blank" onclick="return recordId('cid',30)">InnoSetup使用笔记 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/1687" 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/1687';}else{window.open('/article/1687');}" style="cursor: pointer;">今天用InnoSetup做安装包时，因为要装的驱动区分32位、64位，64位系统中要安装32位+64位驱动。想在脚本中进行判断。折腾一阵，终于搞定：参考了：http://379910987.blog.163.com/blog/static/3352379720111164242382/InnoSetup使用笔记</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 01:32:38</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3445</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/12823" title="【一步一步学IOS5 】定制UITableView表视图单" target="_blank" onclick="return recordId('cid',30)">【一步一步学IOS5 】定制UITableView表视图单 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12823" 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/12823';}else{window.open('/article/12823');}" style="cursor: pointer;">之前，我们已经创建了一个简单的表视图App，用来显示菜单列表和图片。下面，我们继续改进该App，是其效果更佳。1）实现不同的行显示不同的图片2)定制表视图单元格1.显示不同的缩略图：在修改代码之前，我们先回顾一下在数据行上显示缩略图的代码：-(UITableViewCell*)tableView:(UITableView*)tableViewcellForRowAtIndexPath:(NSIndexPath*)indexPath{staticNSStri</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 09:30:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3444</span></span>  </p> </article><article class="excerpt"> <header> <a title="Hadoop" class="label label-important zj-del-target" href="/category/60">Hadoop<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/10721" title="《openstack 和hadoop的区别是什么？》" target="_blank" onclick="return recordId('cid',30)">《openstack 和hadoop的区别是什么？》 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/10721" 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/10721';}else{window.open('/article/10721');}" style="cursor: pointer;">openstack和hadoop的区别是什么？（一）openstack仿照的Amazon的云，hadoop仿照的是Google的云openstack注重的是虚拟化/虚拟机及其配套的服务，hadoop注重的是海量的数据分析和处理。（二）2OpenStack主要目的是做一整套的云计算基础构架。包括云计算(Compute),网络(Network)，对象存贮(ObjectStore)，镜像文件存储(Image)，身份认证(Authentication)，Block</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 09:27:35</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3444</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/15894" title="Python与C之间的相互调用（Python C API及Pytho" target="_blank" onclick="return recordId('cid',30)">Python与C之间的相互调用（Python C API及Pytho </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15894" 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/15894';}else{window.open('/article/15894');}" style="cursor: pointer;">writeby九天雁翎(JTianLing)--blog.csdn.net/vagrxie讨论新闻组及文件我实现“onekeycodehighlighter"中碰到的一些小问题，需要实现全局快捷键，但是是事实上Qt并没有对全局快捷键提供支持，那么用Qt的话就只能通过Win32Api来完成了，而我，用的是PyQt，还需要用Python来调用win32API，事实上，都没有什么难的。因为Python如此的流行，导致，开源社区按照自己的爱好，对于Python与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 22:34:19</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3443</span></span>  </p> </article><article class="excerpt"> <header> <a title="redis" class="label label-important zj-del-target" href="/category/63">redis<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6731" title="Redis 查询" target="_blank" onclick="return recordId('cid',30)">Redis 查询 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6731" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/2.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6731';}else{window.open('/article/6731');}" style="cursor: pointer;">字符串类型是Redis中最为基础的数据存储类型，它在Redis中是二进制安全的，这便意味着该类型可以接受任何格式的数据，如JPEG图像数据或Json对象描述信息等。在Redis中字符串类型的Value最多可以容纳的数据长度是512M。1.SET/GET/APPEND/STRLEN:/>redis-cli#执行Redis客户端工具。redis127.0.0.1:6379>existsmykey#判断该键是否存在，存在返回1，否则返回0。(integer)0r</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 01:53:25</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3443</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/17585" title="详解css中用clip剪切图片的原理和方法" target="_blank" onclick="return recordId('cid',30)">详解css中用clip剪切图片的原理和方法 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17585" 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/17585';}else{window.open('/article/17585');}" style="cursor: pointer;">clip剪切图片示意图假设原图片的宽度高度500×375（px）<html><head><styletype="text/css"></style></head><body><imgsrc="http://photo7.yupoo.com/20070428/081241_1280937036.jpg"width="500"height=</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 22:55:34</span></span> <span class="muted"><i class="fa 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