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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">3085</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/26538" title="python rtree使用" target="_blank" onclick="return recordId('cid',30)">python rtree使用 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/26538" 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/26538';}else{window.open('/article/26538');}" style="cursor: pointer;">安装pipinstallRtree在使用中，可以对点线面元素进行索引，对于点用一个阈值做外包，对于线面可以求外包，有外包以后就可以把数据插入索引，然后就可以求相交和临近。使用例子：fromrtreeimportindexclassMyIndex(object):def__init__(self,pose,distance):self.localPos=poseself.distance=distanceif__name__=='__main__':idx=</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 17:50:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3084</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/20018" title="ASP.NET1.1下TreeView海量数据绑定" target="_blank" onclick="return recordId('cid',30)">ASP.NET1.1下TreeView海量数据绑定 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20018" 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/20018';}else{window.open('/article/20018');}" style="cursor: pointer;">如何实现将上万条数据绑定到微软的TreeView控件上.？下面给出一个解决方法。很简单以便大家参考。效果图关于TreeView的基本用法详见我前面的几篇文章。部分实现代码如下：privatevoidPage_Load(objectsender,System.EventArgse){evaluateRemotObj=(IEvaluate)Activator.GetObject(typeof(IEvaluate),System.Configuration.Co</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 23:27:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3084</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/16809" title="(第Ⅲ部分结构型模式篇) 第12章享元模式（Fly" target="_blank" onclick="return recordId('cid',30)">(第Ⅲ部分结构型模式篇) 第12章享元模式（Fly </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16809" 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/16809';}else{window.open('/article/16809');}" style="cursor: pointer;">——.NET设计模式系列之十三Terrylee，2006年3月摘要：面向对象的思想很好地解决了抽象性的问题，一般也不会出现性能上的问题。但是在某些情况下，对象的数量可能会太多，从而导致了运行时的代价。那么我们如何去避免大量细粒度的对象，同时又不影响客户程序使用面向对象的方式进行操作？本文试图通过一个简单的字符处理的例子，运用重构的手段，一步步带你走进Flyweight模式，在这个过程中我们一同思考、探索、权衡，通过比较而得出好的实现方式，而不是给你最终的一</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 22:45:56</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3084</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/10.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">3084</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/14012" title="eclipse Errors running builder 'JavaScript V" target="_blank" onclick="return recordId('cid',30)">eclipse Errors running builder 'JavaScript V </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14012" 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/14012';}else{window.open('/article/14012');}" style="cursor: pointer;">跑java程序时提示错误：Errorsoccurredduringthebuild.Errorsrunningbuilder'JavaScriptValidator'onproject'......'.java.lang.NullPointerException导致计算机运行速度很慢，因此想取消关于js校验的工作。提高eclipse运行的速度。解决方法：项目—-右键Properties—-Builders—-取消“JavaScriptValidator”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 22:10:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3084</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/5767" title="c#一次数据库查询，JS实现内容分页" target="_blank" onclick="return recordId('cid',30)">c#一次数据库查询，JS实现内容分页 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/5767" 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/5767';}else{window.open('/article/5767');}" style="cursor: pointer;">一次数据库操作---JS实现内容分页，避免无谓的数据库查询往返操作，仅提供思维供大家参考，缩短大家的学习时间。（当然对于内容过于庞大的数据，呵呵，对于一个内容对象应该不至于很大）内容分页aspx文件js代码如下：JS代码1<scriptlanguage="javascript"type="text/javascript">2 </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/22124" title="NPOI根据Excel模板生成原生的Excel文件实例" target="_blank" onclick="return recordId('cid',30)">NPOI根据Excel模板生成原生的Excel文件实例 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/22124" 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/22124';}else{window.open('/article/22124');}" style="cursor: pointer;">上周完成了一个报表小项目，使用开源组件NPOI作为主要组件。之所以采用第三方的开源组件而不使用COM或微软提供的API，原因就不多说了，大家懂的。在此分享NPOI的一个应用，利用Excel模板生成excel文件。这正是NPOI强于Myxls之处。具体步骤如下：一、准备数据USE[MonthReportDemo]GO/******Object:Table[dbo].[TradeReport]ScriptDate:04/15/201119:10:37*****</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 23:53:33</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3083</span></span>  </p> </article><article class="excerpt"> <header> <a title="C++" class="label label-important zj-del-target" href="/category/42">C++<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/19735" title="C++学习笔记(五)--虚函数表解析" target="_blank" onclick="return recordId('cid',30)">C++学习笔记(五)--虚函数表解析 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19735" 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/19735';}else{window.open('/article/19735');}" style="cursor: pointer;">前言C++中的虚函数的作用主要是实现了多态的机制。关于多态，简而言之就是用父类型别的指针指向其子类的实例，然后通过父类的指针调用实际子类的成员函数。这种技术可以让父类的指针有“多种形态”，这是一种泛型技术。所谓泛型技术，说白了就是试图使用不变的代码来实现可变的算法。比如：模板技术，RTTI技术，虚函数技术，要么是试图做到在编译时决议，要么试图做到运行时决议。关于虚函数的使用方法，我在这里不做过多的阐述。大家可以看看相关的C++的书籍。在这篇文章中，我只想从</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 23:23:28</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3083</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/category/30/p/1">首页</a></li> <li class="prev-page"><a 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