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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">3003</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/11.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">3003</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/8.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">3003</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/13772" title="javascript 身份证及电话号码验证" target="_blank" onclick="return recordId('',)">javascript 身份证及电话号码验证 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13772" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13772';}else{window.open('/article/13772');}" style="cursor: pointer;">//这个可以验证15位和18位的身份证，并且包含生日和校验位的验证。//如果有兴趣，还可以加上身份证所在地的验证，就是前6位有些数字合法有些数字不合法。functionisIdCardNo(num){num=num.toUpperCase();//身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X。if(!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(num))){al</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 22:07:53</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3003</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/7375" title="db2 快照 SNAPSHOT" target="_blank" onclick="return recordId('',)">db2 快照 SNAPSHOT </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7375" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/1.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/7375';}else{window.open('/article/7375');}" style="cursor: pointer;">打开和关闭快照缺省情况不打开DB2监控，必须在连接或实例级别上进行设置。有一系列监视器开关来决定是否监控某种数据元素。还预留了一个内存堆，用于包含为监控而存储的信息。1：在instance级别上设置监视器开关在实例级别上设置监视器开关会影响连接到该实例中任何数据库的所有用户。下面是监视器开关DFT_MON_STMT：语句监视器（用于动态SQL）DFT_MON_TABLE：表监视器DFT_MON_LOCK：锁监视器DFT_MON_BUFPOOL：缓冲池监视器</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">2019-08-12 01:54:05</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3003</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/19.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">3003</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/420" title="Javascript图像处理——阈值" target="_blank" onclick="return recordId('',)">Javascript图像处理——阈值 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/420" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/6.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/420';}else{window.open('/article/420');}" style="cursor: pointer;">前言上一篇文章，我们讲解了图像处理中的亮度和对比度的变化，这篇文章我们来做一个阈值函数。最简单的图像分割方法阈值是最简单的图像分割方法。比如为了从下图中分割出苹果，我们利用前景与背景的灰度差值，通过设定一个阈值，对于该像素大于这个阈值时就以黑色表示，小于便以灰色表示。五种阈值类型和OpenCV一样，我们将提供五种阈值类型，方便使用。下面是原图像的波形表示，纵坐标表示像素点的灰度值大小，蓝线是阈值大小。二进制阈值化公式表示是：图像表示是：可见超过该阈值的就变</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 01:32:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3003</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/20435" title="用JavaScript获取页面上被选中的文字的技巧" target="_blank" onclick="return recordId('',)">用JavaScript获取页面上被选中的文字的技巧 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/20435" 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/20435';}else{window.open('/article/20435');}" style="cursor: pointer;">这里介绍的一个小技巧是如何用JavaScript获取页面上被选中的文字的方法。最关键的JavaScriptAPI是：event.selection=window.getSelection();这里的selection实际上是个对象，但如果我们使用.toString()或强行转化成字符串，我们将得到被选中的文字。$(document).ready(function(){$(".contenttext").mouseup(function(e){vartxt;</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 23:32:32</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3002</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('',)">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/17.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">3002</span></span>  </p> </article><article class="excerpt"> <header> <a title="Jquery" class="label label-important zj-del-target" href="/category/65">Jquery<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3833" title="jQuery ajax —— Baidu ajax" target="_blank" onclick="return recordId('',)">jQuery ajax —— Baidu ajax </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/3833" 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/3833';}else{window.open('/article/3833');}" style="cursor: pointer;">你没有看错标题，本文的确是在讲Baiduajax，不过是很久很久以前的版本了。由于jQueryajax模块有800+行，而核心函数jQuery.ajax就有380+行，直接分析这段代码很容易被代码逻辑弄晕。所以我们先分析一段简单的ajax代码，来自早期的百度七巧板项目。通过这个来先复习一遍ajax的知识。baidu.ajax.request分离版/***发送一个ajax请求*@author:allstar,erik,berg*@nameajax.reque</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 01:33:30</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3002</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/thrift/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/thrift/1/p/193">上一页</a></li> <li><a href="/search/thrift/1/p/192">192</a></li><li><a href="/search/thrift/1/p/193">193</a></li><li class="active"><span>194</span></li><li><a href="/search/thrift/1/p/195">195</a></li><li><a href="/search/thrift/1/p/196">196</a></li> <li class="next-page"><a 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