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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">3607</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/13005" title="C#里巧用DateTime预设一些可选的日期范围(如本" target="_blank" onclick="return recordId('',)">C#里巧用DateTime预设一些可选的日期范围(如本 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/13005" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13005';}else{window.open('/article/13005');}" style="cursor: pointer;">C#里巧用DateTime预设一些可选的日期范围(如本年度、本季度、本月等)//大家在做报表或查询的时候都会有给用户预设一些可选的日期范围(如上图)//如本年度销售额、本季度利润、本月新增客户//C#里内置的DateTime基本上都可以实现这些功能，巧用DateTime会使你处理这些事来变轻松多了//今天DateTime.Now.Date.ToShortDateString();//昨天，就是今天的日期减一DateTime.Now.AddDays(-1).</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 21:57:54</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3607</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/11630" title="SWT窗口禁用最大化" target="_blank" onclick="return recordId('',)">SWT窗口禁用最大化 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11630" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11630';}else{window.open('/article/11630');}" style="cursor: pointer;">SWT中的窗口窗口样式Shellshell=newShell(newDisplay(),SWT.MIN);Shell类的不同样式SWT.TITLE:只显示标题栏SWT.CLOSE:只显示关闭SWT.MIN:只显示最小化和关闭SWT.MAX:只显示最大化和关闭SWT.BORDER:只显示边框SWT.RESIZE:窗口的大小可以通过鼠标手动来设定SWT.NO_TRIM:既无边框也无标题SWT.SHELL_TRIM:相当于CLOSETITLEMINMAXRESI</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 09:29:52</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3607</span></span>  </p> </article><article class="excerpt"> <header> <a title="Ubuntu" class="label label-important zj-del-target" href="/category/55">Ubuntu<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2524" title="Ubuntu10.10环境变量设置" target="_blank" onclick="return recordId('',)">Ubuntu10.10环境变量设置 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/2524" 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/2524';}else{window.open('/article/2524');}" style="cursor: pointer;">a.下载jdk安装文件，这里下载bin格式，复制安装文件至/home/java下b.使用"chmod777"或"chomd+x"向文件添加可执行权限sudochomd+xjdk-6u23-linux-i586.binc.运行该文件sudo./jdk-6u23-linux-i586.bin运行后，程序会自动解压缩，并生成相应目录。到此，jdk安装已经完成.d.环境变量的添加：打开/etc/profile,在umask022”前添加如下内容：exportJAV</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">3607</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/22160" title="轻量级B/S应用开发引擎：NoahWeb" target="_blank" onclick="return recordId('',)">轻量级B/S应用开发引擎：NoahWeb </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/22160" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/16.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/22160';}else{window.open('/article/22160');}" style="cursor: pointer;">同事介绍，说一款BS开发引擎比较强大，处理表单之类的比较不错，今天找来看看。网址：http://www.noahweb.net/帮助：http://docs.noahweb.net/看看他们网站上怎么介绍的：//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////</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 23:54:03</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3606</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/0/1/p/1">首页</a></li> <li class="prev-page"><a 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