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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">3533</span></span>  </p> </article><article class="excerpt"> <header> <a title="PHP" class="label label-important zj-del-target" href="/category/64">PHP<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9297" title="PHP memcache" target="_blank" onclick="return recordId('',)">PHP memcache </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9297" 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/9297';}else{window.open('/article/9297');}" style="cursor: pointer;">windows环境：添加服务.sccreateMemcachedserver11212binpath="C:\memcache\memcached.exe-drunservice-m500-p11212"start=autodisplayname="Memcachedserver(11212)"要是一台机有多个,那就改下端口再搞一次撒~php使用Memcache函数库是在PECL(PHPExtensionCommunityLibrary)中，主要作用是搭建</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 09:26:49</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3533</span></span>  </p> </article><article class="excerpt"> <header> <a title="数据库相关" class="label label-important zj-del-target" href="/category/32">数据库相关<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/6174" title="ON、WHERE、HAVING的区别" target="_blank" onclick="return recordId('',)">ON、WHERE、HAVING的区别 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6174" 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/6174';}else{window.open('/article/6174');}" style="cursor: pointer;">ON、WHERE、HAVING都能通过限制条件筛选数据，但他们的使用及其不同。下面我们来分析三者之间的区别。1.ON和WHERE所有的查询都回产生一个中间临时报表，查询结果就是从返回临时报表中得到。ON和WHERE后面所跟限制条件的区别，主要与限制条件起作用的时机有关，ON根据限制条件对数据库记录进行过滤，然后生产临时表；而WHERE是在临时表生产之后，根据限制条件从临时表中筛选结果。因为以上原因，ON和WHERE的区别主要有下：1）返回结果：在左外（右外</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 01:52:47</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3533</span></span>  </p> </article><article class="excerpt"> <header> <a title="各行各业" class="label label-important zj-del-target" href="/category/38">各行各业<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/9868" title="selenium2（WebDriver）环境搭建" target="_blank" onclick="return recordId('',)">selenium2（WebDriver）环境搭建 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/9868" 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/9868';}else{window.open('/article/9868');}" style="cursor: pointer;">1、安装jdk并配置环境变量：jdk安装jdk下载地址：http://www.oracle.com/technetwork/java/javase/downloads/index.html环境变量配置，如：CLASSPATH=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jarJAVA_HOME=D:\ProgramFiles\Java\jdk1.6.0_10PATH=%JAVA_HOME%\bin2、安装F</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 09:27:08</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3532</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/995" title="跟我学系列教程——《13天让你学会Redis》火热" target="_blank" onclick="return recordId('',)">跟我学系列教程——《13天让你学会Redis》火热 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/995" 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/995';}else{window.open('/article/995');}" style="cursor: pointer;">学习目标每天2小时，13天让你学会Redis。本课程针对Redis新手，甚至连Redis是什么都没有听说过的同学。课程会具体介绍Redis是什么以及为什么要使用Redis，结合项目实践旨在让学生从零開始逐步晋升为一个Redis的优秀开发人员。适合人群1.在校学生：掌握多门存储技术，丰富毕业设计，贴近企业新技术2.在职开发：技术储备，提高晋升空间。报名链接点击报名跟我学系列教程——《13天让你学会Redis》火热报名中</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 01:32:21</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3532</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/11358" title="股票API之---新浪财经频道" target="_blank" onclick="return recordId('',)">股票API之---新浪财经频道 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11358" 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/11358';}else{window.open('/article/11358');}" style="cursor: pointer;">实时股票数据接口大全股票数据的获取目前有如下两种方法可以获取:1.http/javascript接口取数据2.web-service接口1.http/javascript接口取数据1.1Sina股票数据接口以大秦铁路（股票代码：601006）为例，如果要获取它的最新行情，只需访问新浪的股票数据接口：http://hq.sinajs.cn/list=sh601006这个url会返回一串文本，例如：varhq_str_sh601006="大秦铁路,27.55,</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 09:29:42</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3531</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/12.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">3531</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/web/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/web/1/p/185">上一页</a></li> <li><a href="/search/web/1/p/184">184</a></li><li><a href="/search/web/1/p/185">185</a></li><li class="active"><span>186</span></li><li><a href="/search/web/1/p/187">187</a></li><li><a href="/search/web/1/p/188">188</a></li> <li class="next-page"><a href="/search/web/1/p/187">下一页</a></li> <li><a href="/search/web/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{ 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