- 军军小站|张军博客

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">3521</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/13860" title="AChartEngine应用之LineChart（模拟动态生命特" target="_blank" onclick="return recordId('',)">AChartEngine应用之LineChart（模拟动态生命特 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13860" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/20.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13860';}else{window.open('/article/13860');}" style="cursor: pointer;">AChartEngine应用之LineChart（模拟动态生命特征值图）接着上一次写的内容，构建动态曲线图，并产生与用户交互，考虑到数据都是活动的，不可能总是用静态数据，所以我下面的demo就是模拟。项目作用：模拟生命特征值图，动态显示分钟脉搏生命特征值走向每隔1000ms产生50组数据，并填充到表格中，主要使用的到是Handler+Task，因为我是用Activity显示这个表格每次产生的数据都需要快速的填充到主线程UI中，所以我就用Handler，这里</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 22:08:56</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3521</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/2512" title="图解div+css命名规则" target="_blank" onclick="return recordId('',)">图解div+css命名规则 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2512" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/7.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/2512';}else{window.open('/article/2512');}" style="cursor: pointer;">一个好的命名习惯对一个网页制作人员来说可以提高代码修改的效率及代码的可读性，本图是彦磊根据自己的习惯整理而成，希望和大家交流，每个人的习惯不一样，不一下完全按照这样的规则来但一定要有自己的一套规则。图解div+css命名规则</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 01:32:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3521</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('',)">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/12.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">3520</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/19800" title="UML" target="_blank" onclick="return recordId('',)">UML </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/19800" 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/19800';}else{window.open('/article/19800');}" style="cursor: pointer;">爱因斯坦曾说过，我们生活在四维空间（xyz在加一条时间t，就是四维了）内。也就是说我们所看到的事物是一个个立体状的模型。抽象地说我们的生活是由一幅幅图组成的，每一时刻对应着一幅图。形象的说我们的眼睛所看到的是生活中的一个个场景，一个个场景组成了一幅图，一幅幅图成为了世界的投影。这些场景是如何组成的呢？其实很简单，场景是由事物和关系组成，如：人、手机、书、电脑等，把这些事物连接到一起记录下来不就组成图了吗。在生活中我们常常用相机或摄影机将图记录下来，这就是我</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 23:24:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3520</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/email/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/email/1/p/185">上一页</a></li> <li><a href="/search/email/1/p/184">184</a></li><li><a href="/search/email/1/p/185">185</a></li><li class="active"><span>186</span></li><li><a href="/search/email/1/p/187">187</a></li><li><a href="/search/email/1/p/188">188</a></li> <li class="next-page"><a href="/search/email/1/p/187">下一页</a></li> <li><a href="/search/email/1/p/2924">末页</a></li> <li><span>共 2924页,共29234条</span></li> </ul> </div> </div> </div>   <style type="text/css"> .d_postlist .text { /* height: 30px; */ display: block; /* height: 100%; */ font-size:14px !important; width:85%; } .zj-dynamic-info li{ margin: 10px 3px; } .zj-dynamic-info .zj-a{ color: blue; cursor: pointer; } </style> <aside class="sidebar"> <div class="widget d_postlist"> <div class="title"> <h2>站内搜索</h2> </div> <ul> <li><div class="zj-search-box zj-pc-search-box"> <form class="searchform themeform" role="form" action="/search" method="get"> <input style="font-size: 120%; margin-top: 10px;" type="ext" class="search" name="search_word" placeholder="搜索从这里开始..." value=""> <i class="fa fa-search"></i> <button class="btn btn-primary" type="button" style="margin-left: -4px;height: 36px !important;"> <span class="zj-icon-text">搜索</span> </button> </form> </div></li> </ul> </div>    <div class="widget d_postlist"> <div class="title"> <h2>加入交流</h2> </div> <ul> <li class="zj-no-wx-app"><a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=f6d1df60dbb7ebc94c2c8a67b1e094e1e90677df1e943d9547d425b81bb218a5"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qq-qun.png" alt=""></span><span class="text">1. 手机QQ扫左侧二维码</span><span class="text">2. 搜Q群：542395358</span> <span class="text">3. 点击<img style="cursor: pointer;" onclick="window.open('//shang.qq.com/wpa/qunwpa?idkey=f6d1df60dbb7ebc94c2c8a67b1e094e1e90677df1e943d9547d425b81bb218a5');" border="0" src="//pub.idqqimg.com/wpa/images/group.png" alt="张军网站共享资料群" title="张军网站共享资料群"> </span></a></li> <li class="zj-no-wx-app"><a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=29dfc8d27e6e13276b9ea9848e3a211c076e130376a7b6ef380ffcc967e8a1fc"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qq-qun.png" alt=""></span><span class="text">1. 手机QQ扫左侧二维码</span><span class="text">2. 搜Q群：922215567</span> <span class="text">3. 点击<img style="cursor: pointer;" onclick="window.open('//shang.qq.com/wpa/qunwpa?idkey=29dfc8d27e6e13276b9ea9848e3a211c076e130376a7b6ef380ffcc967e8a1fc');" border="0" src="//pub.idqqimg.com/wpa/images/group.png" alt="java技术沟通群" title="java技术沟通群"> </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx-gzh.jpg" alt="关注企业微信公众号"></span><span class="text">1.手机微信扫左侧二维码 </span><span class="text">2. 微信中搜索：上海加盾信息科技有限公司</span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx-app-zhangjunbk.jpg" alt="关注军军小站|张军博客小程序"></span><span class="text">1.手机微信扫左侧二维码 </span><span class="text">2. 微信搜索小程序：张军博客 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx-app-shanghaijiadun.jpg" alt="关注企业微信小程序"></span><span class="text">1.手机微信扫左侧二维码 </span><span class="text">2. 微信搜索小程序：上海加盾信息科技有限公司</span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/dingding.jpg" alt="关注企业钉钉"></span><span class="text">关注企业钉钉 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qywx-my.png" alt="关注企业微信"></span><span class="text">关注企业微信 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx.zhangjunbk.com.png" alt="微信扫一扫添加张军网站微信群"></span><span class="text">微信扫一扫添加张军网站微信群 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/my-wx.png" alt="添加我为微信好友"></span><span class="text">微信扫一扫加我为好友 </span></a></li> </ul> </div>  <div class="widget d_tag"> <div class="title"> <h2>标签云</h2> </div> <div class="d_tags"> <a title="金融业务" href="/tag/37" onclick="return recordId('tid',37)">金融业务 (4)</a><a title="教育资料" href="/tag/39" onclick="return recordId('tid',39)">教育资料 (10)</a><a title="Java" href="/tag/41" onclick="return recordId('tid',41)">Java (901)</a><a title="C++" href="/tag/42" onclick="return recordId('tid',42)">C++ (86)</a><a title="C#" href="/tag/43" onclick="return recordId('tid',43)">C# (215)</a><a title="Python" href="/tag/44" onclick="return recordId('tid',44)">Python (9022)</a><a title="Oracle" href="/tag/45" onclick="return recordId('tid',45)">Oracle (911)</a><a title="SqlServer" href="/tag/46" onclick="return recordId('tid',46)">SqlServer (681)</a><a title="MySql" href="/tag/47" onclick="return recordId('tid',47)">MySql (600)</a><a title="DB2" href="/tag/48" onclick="return recordId('tid',48)">DB2 (33)</a><a title="PostgreSql" href="/tag/49" onclick="return recordId('tid',49)">PostgreSql (23)</a><a title="Tomcat" href="/tag/50" onclick="return recordId('tid',50)">Tomcat (825)</a><a title="Weblogic" href="/tag/51" onclick="return recordId('tid',51)">Weblogic (12)</a><a title="Windows" href="/tag/52" onclick="return recordId('tid',52)">Windows (214)</a><a title="Linux" href="/tag/53" onclick="return recordId('tid',53)">Linux (647)</a><a title="VMware" href="/tag/54" onclick="return recordId('tid',54)">VMware (32)</a><a title="Ubuntu" href="/tag/55" onclick="return recordId('tid',55)">Ubuntu (194)</a><a title="ASP.NET" href="/tag/56" onclick="return recordId('tid',56)">ASP.NET (198)</a><a title="Android" href="/tag/57" onclick="return recordId('tid',57)">Android (681)</a><a title="IOS" href="/tag/58" onclick="return recordId('tid',58)">IOS (75)</a><a title="Hive" href="/tag/59" onclick="return recordId('tid',59)">Hive (45)</a><a title="Hadoop" href="/tag/60" onclick="return recordId('tid',60)">Hadoop (50)</a><a title="Hbase" href="/tag/61" onclick="return recordId('tid',61)">Hbase (9)</a><a title="Spark" href="/tag/62" onclick="return recordId('tid',62)">Spark (4)</a><a title="redis" href="/tag/63" onclick="return recordId('tid',63)">redis (78)</a><a title="PHP" href="/tag/64" onclick="return recordId('tid',64)">PHP (145)</a><a title="Jquery" href="/tag/65" onclick="return recordId('tid',65)">Jquery (174)</a><a title="Javascript" href="/tag/66" onclick="return recordId('tid',66)">Javascript (168)</a><a title="NoSQL" href="/tag/67" onclick="return recordId('tid',67)">NoSQL (6)</a><a title="CSS" href="/tag/68" onclick="return recordId('tid',68)">CSS (127)</a><a title="资料下载" href="/tag/69" onclick="return recordId('tid',69)">资料下载 (25)</a><a title="交易系统" href="/tag/70" onclick="return recordId('tid',70)">交易系统 (9)</a><a title="java工具类" href="/tag/71" onclick="return recordId('tid',71)">java工具类 (32)</a><a title="其它" href="/tag/72" onclick="return recordId('tid',72)">其它 (7)</a><a title="秕处理" href="/tag/73" onclick="return recordId('tid',73)">秕处理 (6)</a><a title="AI技术" href="/tag/74" onclick="return recordId('tid',74)">AI技术 (3)</a> </div> </div>  <div class="zj-no-wx-app widget widget_links"> <div class="title"> <h2 style="float: left;">友情链接</h2><h2 style="float: right;"><a class="zj-titles" href="/link">申请友链</a></h2> </div> <ul class="xoxo blogroll">  <li> <a class="zj-titles" title="张军博客" href="https://www.zhangjunbk.com/" target="_blank">张军博客</a> </li>  <li><a class="zj-titles" title="上海加盾信息科技有限公司" href="https://www.shanghaijiadun.com" target="_blank">上海加盾信息科技有限公司</a></li><li><a class="zj-titles" title="股票002162悦心健康资金分析" href="/stock/my" target="_blank">股票002162悦心健康资金分析</a></li><li><a class="zj-titles" title="张军博客" href="https://www.zhangjunbk.com/" target="_blank">张军博客</a></li><li><a class="zj-titles" title="张军博客-网址导航" href="https://www.zhangjunbk.com/web-nav/index.htm" target="_blank">张军博客-网址导航</a></li><li><a class="zj-titles" title="张军java工具类" href="http://www.zhangjunbk.com/otherlink/javatooldoc/" target="_blank">张军java工具类</a></li><li><a class="zj-titles" title="快手号出售" href="https://www.weihaoyi.com" target="_blank">快手号出售</a></li><li><a class="zj-titles" title="张军博客-SpringBoot入门" href="https://zhangjunbk.com/Public/static/md/SpringBoot/index.html" target="_blank">张军博客-SpringBoot入门</a></li> </ul> </div>  <div class="zj-no-wx-app widget widget_links"> <div class="title"> <h2 style="float: left;">51链网站</h2> </div> <ul class="xoxo blogroll"> <li><a class="zj-titles" title="51链首页" href="https://www.51link.com?ruid=16279" target="_blank">51链首页</a></li> <li><a class="zj-titles" title="51链注册页" href="https://www.51link.com/mobileRegister?ruid=16279" target="_blank">51链注册页</a></li> <li><a class="zj-titles" title="广告出售页" href="https://www.51link.com/ad-sell?ruid=16279" target="_blank">广告出售页</a></li> <li><a class="zj-titles" title="友链出租页" href="https://www.51link.com/link-sell?ruid=16279" target="_blank">友链出租页</a></li> <li><a class="zj-titles" title="软文出售页" href="https://www.51link.com/article-sell?ruid=16279" target="_blank">软文出售页</a></li> <li><a class="zj-titles" title="友链交换页" href="https://www.51link.com/link-exchange?ruid=16279" target="_blank">友链交换页</a></li> </ul> </div>          </aside>  <script type="text/javascript"> $(function(){ }); </script> </section>   <footer class="footer"> <div class="footer-inner"> <div class="copyright pull-left"> <a href="/">军军小站|张军博客</a> 丨 <a target="_blank" href="https://www.shanghaijiadun.com/product#id-5">获取加密软件注册码</a>丨<a target="_blank" href="https://www.shanghaijiadun.com">上海加盾信息科技有限公司</a>丨<a href="/article/24">个人简介</a> 丨 © 2020-2030 版权所有丨<a target="_blank" href="https://beian.miit.gov.cn/">沪ICP备19026782号-2</a> | <a href="/link">申请友链</a> | 站长QQ：<a target="_blank" href="http://wpa.qq.com/msgrd?v=3&uin=360901061&site=qq&menu=yes">360901061</a> </div> </div> </footer> <div class="rollto zj-rollto"> <button class="btn btn-inverse zj-totop" data-type="totop" title="回顶部" zj-title-options="direction:'left'"> <i class="fa fa-arrow-up"></i> </button> <button class="btn btn-inverse zj-torespond" data-type="torespond" title="发评论" zj-title-options="direction:'left'"> <i class="fa fa-comment-o"></i> </button> </div> <div class="zj-mark"></div> <div class="zj-search-box zj-mini-search-box" style="position: fixed; top: 0px; background: #FFF; height: 100%; width: 100%; text-align: center; display: none; background:; z-index: 2000"> <span class="close zj-close" style="top: 3%; right: 8%; font-size: 220%; color: #000;"></span> <form class="searchform themeform" role="form" action="/search" method="get" style="margin: 20% auto;"> <input style="font-size: 120%; margin-top: 10px;" type="ext" class="search" name="search_word" placeholder="搜索从这里开始..." value=""> <button class="btn btn-primary" type="button" style="margin-left: -4px; height: 36px !important;"> <span class="zj-icon-text">搜索</span> </button> </form> </div>  <script src="/Public/static/js/wxLogin.js?v=1.1.1"></script> <script src="/Public/static/js/jweixin-1.3.2.js?v=1.0.1"></script> <script src="/Template/default/Home/Public/js/zj.basic.js?v=1.1.1"></script> <script src="/Template/default/Home/Public/js/zj.jq.ui.js?v=1.1.1"></script> <script src="/Template/default/Home/Public/js/zj.jq.js?v=1.1.1"></script> <script src="/Template/default/Home/Public/js/zj.jq.web.js?v=1.1.1"></script> <script src="/Template/default/Home/Public/js/zj.validate.js?v=1.1.1"></script> <script src="/Template/default/Home/Public/js/qrcode.min.js?v=1.1.1"></script> <script src="/Public/static/ueditor1_4_3/third-party/SyntaxHighlighter/shCore.js?v=1.0.1"></script> <script src="/Public/static/js/stomp.js?v=1.0.1"></script> <script type="text/javascript"> $(document).ready(function(){ SyntaxHighlighter.all(); }); </script>  <script src="/Template/default/Home/Public/js/zj.app.js?v=1.1.1"></script> <script src="/Template/default/Home/Public/js/zj.login.reg.js?v=1.1.1"></script> <script type="text/javascript"> $(function() { setTimeout(function(){ // 方式1：默认点击自身（推荐） // $('.return-top').returnTop(); // 方式2：自定义点击对象（比如点击"顶部"文字触发） $(".zj-rollto").returnTop($(".zj-totop")); // 方式3：需要时解绑事件（如页面切换时） // $('.return-top').offReturnTop(); },100); if ($('.v-comment').length == 0) { $('.zj-torespond').remove(); } else { $('.zj-torespond').click(function() { $('.v-comment').focus(); }); } }); </script>    <script> (function() { var script = document.createElement('script'); script.src = "https://jspassport.ssl.qhimg.com/11.0.1.js?d182b3f28525f2db83acfaaf6e696dba"; script.id = "sozz"; script.async = true; script.defer = true; document.head.appendChild(script); })(); </script> </body> </html>

热门排行

Redis内存使用优化与存储

28个PHP常用类，加开你的开发速度

PHP memcache

跟我学系列教程——《13天让你学会Redis》火热

selenium2（WebDriver）环境搭建

JavaScript 的性能优化：加载和执行