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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">3642</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/30299" title="递推最小二乘法——python程序" target="_blank" onclick="return recordId('',)">递推最小二乘法——python程序 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/30299" 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/30299';}else{window.open('/article/30299');}" style="cursor: pointer;">算法引用的数据为python自带的波士顿房价数据。代码如下：#data第一列为标记值#data后几列为特征向量#initialTheta为需要求得的thetaimportnumpyasnpimportsklearn.datasetsfromsklearn.model_selectionimporttrain_test_splitfromsklearn.metricsimportmean_squared_errorimportmatplotlibasmpli</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 17:56:20</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3641</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/11691" title="Ext.ux.UploadDialog.Dialog Ext上传" target="_blank" onclick="return recordId('',)">Ext.ux.UploadDialog.Dialog Ext上传 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11691" 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/11691';}else{window.open('/article/11691');}" style="cursor: pointer;">今天做项目做了个上传的功能，不过遇到好多问题，先在这做个笔记。。。。先引入Java代码<linkrel="stylesheet"type="text/css"href="<%=path%>/css/ext-all.css"/><scripttype="text/javascript"src="<%=path%>/js/ext-base.js"></script><scripttype="t</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 09:29:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3641</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/2013" title="CodeSmith学习笔记(二)：操作数据库" target="_blank" onclick="return recordId('',)">CodeSmith学习笔记(二)：操作数据库 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2013" 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/2013';}else{window.open('/article/2013');}" style="cursor: pointer;">1.打开SchemaExploer配置数据库连接，定义表属性的Type为SchemaExplorer.TableSchema,数据库属性Type为SchemaExplorer.DatabaseSchema.2.定义内部的方法，下面调用用到的3.循环表的非主键4.定义输出到文件，枚举类型（头部定义属性时用到），常量。5.选择属性6.运行，结果如下CodeSmith学习笔记(二)：操作数据库</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 01:32:44</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3641</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('',)">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/14.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">3641</span></span>  </p> </article><article class="excerpt"> <header> <a title="SqlServer" class="label label-important zj-del-target" href="/category/46">SqlServer<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/7521" title="SQL SERVER 2012 第三章 T-SQL 基本语句 having" target="_blank" onclick="return recordId('',)">SQL SERVER 2012 第三章 T-SQL 基本语句 having </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/7521" 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/7521';}else{window.open('/article/7521');}" style="cursor: pointer;">SELECTManagerIDASManager,COUNT(*)ASReportsFROMHuman.Resources.Employee2WHEREEmployeeID!=5GROUPBYManagerIDHAVINGCOUNT(*)>3;having是聚合以后算的，很棒。where是聚合以前算的。用FORXML子句可以输出XML格式。ALLDISTINCT的用法。SQLSERVER2012第三章T-SQL基本语句having子句</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 01:54:14</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3640</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/6725" title="在.NET平台下使用C#通过Thrift访问Cassandra" target="_blank" onclick="return recordId('',)">在.NET平台下使用C#通过Thrift访问Cassandra </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/6725" 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/6725';}else{window.open('/article/6725');}" style="cursor: pointer;">几家做seo无耻公司名单http://www.byywee.comhttp://www.cosdiv.com通过在自已网站加入别人网站连接，这种网站专门对新开通的网站做连接,从而达到宣传他们目的，http://www.renrenaj.com/about/copyright.html1、下载Thrift两个文件:thrift-0.7.0.tar.gzThriftcompilerforWindows2、获取Thrift.dll解压后，找到源代码：thrift</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 01:53:24</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3640</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/12122" title="从C/C++语言到Objective-C语言" target="_blank" onclick="return recordId('',)">从C/C++语言到Objective-C语言 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12122" 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/12122';}else{window.open('/article/12122');}" style="cursor: pointer;">无标题文档原文链接:http://www.yifeiyang.net/iphone-development-introduction-7-from-the-c-c-language-to-objective-c-language/Objective-C，通常写作ObjC和较少用的ObjectiveC或Obj-C，是扩充C的面向对象编程语言。所以有一定C/C++语言基础理解和掌握Objective-C也会相应的快些。这回，我们将比较着学习Objective-</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 09:30:10</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3639</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/19.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">3639</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/myeclipse/1/p/1">首页</a></li> <li class="prev-page"><a 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