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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">3106</span></span>  </p> </article><article class="excerpt"> <header> <a title="操作系统" class="label label-important zj-del-target" href="/category/34">操作系统<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/682" title="无法解决 equal to 操作中 "SQL_Latin1_General" target="_blank" onclick="return recordId('',)">无法解决 equal to 操作中 "SQL_Latin1_General </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/682" 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/682';}else{window.open('/article/682');}" style="cursor: pointer;">无法解决equalto操作中"SQL_Latin1_General_CP1_CI_AS"和"Chinese_PRC_CI_AS"之间的排序规则冲突。CannotresolvethecollationconflictbetweenSQL_Latin1_General_CP1_CI_ASandFinnish_Swedish_CI_ASintheequaltooperation.工作中，从国外得到一个MSSQLServer2005的备份文件，打算把他还原到本地服</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 01:32:12</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3106</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/15949" title="C/C++使用命令参数介绍" target="_blank" onclick="return recordId('',)">C/C++使用命令参数介绍 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15949" 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/15949';}else{window.open('/article/15949');}" style="cursor: pointer;">我们从写第一个HelloWorld程序时，就开始使用main函数。后来学到Windows编程，又开始使用WinMain函数。我们都知道每个程序都得有个主函数入口。今天就简单介绍一下我们使用主函数时给它传入命令参数。很早以前就想写了，但是一直没有找到合适的地方。今天碰到项目中的一个问题，便想起了这块儿。。我们通常写控制台main都没有带参数，因为我们很少用到。这个命令参数的功能呢就会涉及到里面的参数。可以这样定义：intmain(intargc,char*a</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 22:34:59</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3105</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/15345" title="【iphone4 iOS4+升级到 iOS 5 beta7详细过程与i" target="_blank" onclick="return recordId('',)">【iphone4 iOS4+升级到 iOS 5 beta7详细过程与i </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15345" 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/15345';}else{window.open('/article/15345');}" style="cursor: pointer;">Himi原创，转载请注明出处，谢谢！原文地址：http://blog.csdn.net/xiaominghimi/article/details/6289625（警告：因为当前iOS5属于beta版，apple没有正式发布，所以一旦你升级到iOS5之后那么你的手机将无法真机测试程序，因为Xcode现在还不支持iOS5的设备，Himi也是后来才想到=。=真机调试果然不出所料=。=，不过幸好Touch比较多，手机可以暂时退出测试部分了，娃哈哈）今天刷iphon</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 22:27:11</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3105</span></span>  </p> </article><article class="excerpt"> <header> <a title="MySql" class="label label-important zj-del-target" href="/category/47">MySql<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/8039" title="visual studio 2012 链接Mysql 5.1" target="_blank" onclick="return recordId('',)">visual studio 2012 链接Mysql 5.1 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/8039" 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/8039';}else{window.open('/article/8039');}" style="cursor: pointer;">首先在nuGet下载MySql.Data.Entity安装mysqlforvisualstudiohttp://www.mysql.com/why-mysql/windows/visualstudio/安装mysqlconnector6.9.3http://dev.mysql.com/downloads/connector/net/6.9.html安装EntityFramework6ToolsforVisualStudio2012http://www.mi</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 01:54:44</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3105</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/jsp/1/p/1">首页</a></li> <li class="prev-page"><a 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