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JavaScript 的性能優(yōu)化：加載和執(zhí)行

概覽無論當(dāng)前JavaScript代碼是內(nèi)嵌還是在外鏈文件中，頁面的下載和渲染都必須停下來等待腳本執(zhí)行完成。JavaScript執(zhí)行過程耗時越久，瀏覽器等待響應(yīng)用戶輸入的時間就越長。瀏覽器在下載和執(zhí)行腳本時出現(xiàn)阻塞的原因在于，腳本可能會改變頁面或JavaScript的命名空間，它們對后面頁面內(nèi)容造成影響。一個典型的例子就是在頁面中使用document.write()。例如清單1清單1JavaScript代碼內(nèi)嵌示例Sou</span> <p class="auth-span"> <span id="br5n5555bvll" class="muted"><i class="fa fa-user"></i><span id="br5n5555bvll" class="zj-icon-text">系統(tǒng)</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-29 22:50:45</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3319</span></span>  </p> </article><article class="excerpt"> <header> <a title="編程技術(shù)" class="label label-important zj-del-target" href="/category/30">編程技術(shù)<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/806" title="通過擴展Django數(shù)據(jù)庫API支持全文搜索" target="_blank" onclick="return recordId('',)">通過擴展Django數(shù)據(jù)庫API支持全文搜索 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/806" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/19.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/806';}else{window.open('/article/806');}" style="cursor: pointer;">通過擴展Django數(shù)據(jù)庫API支持全文搜索本文為翻譯內(nèi)容，原文請查看http://www.mercurytide.com/介紹DjangoDjango是一個開源的Web應(yīng)用程序框架，引用創(chuàng)作者的話來說就是：“鼓勵快速開發(fā)和干凈、實效的設(shè)計”。它由Python編寫，并提供各種組件以創(chuàng)建高質(zhì)量的Web應(yīng)用程序，包括一個ORM（object-relationalmapper）框架、一個支持全部特性的模板系統(tǒng)、URL分發(fā)器、會話管理、安全認證和其他更多的東西。一</span> <p class="auth-span"> <span id="br5n5555bvll" class="muted"><i class="fa fa-user"></i><span id="br5n5555bvll" class="zj-icon-text">系統(tǒng)</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:32:16</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3319</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/20294" title="淺析C++中虛函數(shù)的調(diào)用及對象的內(nèi)部布局" target="_blank" onclick="return recordId('',)">淺析C++中虛函數(shù)的調(diào)用及對象的內(nèi)部布局 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/20294" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/20294';}else{window.open('/article/20294');}" style="cursor: pointer;">在我那篇《淺析C++中的this指針》中，我通過分析C++代碼編譯后生成的匯編代碼來分析this指針的實現(xiàn)方法。這次我依然用分析C++代碼編譯后生成的匯編代碼來說明C++中虛函數(shù)調(diào)用的實現(xiàn)方法，順便也說明一下C++中的對象內(nèi)部布局。下面所有的匯編代碼都是用VC2005編譯出來的。雖然，不同的編譯器可能會編譯出不同的結(jié)果，對象的內(nèi)部布局也不盡相同；但是，只要是符合C++標(biāo)準(zhǔn)的編譯器，編譯結(jié)果和對象的內(nèi)部布局應(yīng)該是大同小異。首先，是一個有著簡單繼承關(guān)系的兩個類</span> <p class="auth-span"> <span id="br5n5555bvll" class="muted"><i class="fa fa-user"></i><span id="br5n5555bvll" class="zj-icon-text">系統(tǒng)</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-29 23:30:45</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3318</span></span>  </p> </article><article class="excerpt"> <header> <a title="編程技術(shù)" class="label label-important zj-del-target" href="/category/30">編程技術(shù)<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/18145" title="使用工具安裝，運行，停止，卸載Window服務(wù)" target="_blank" onclick="return recordId('',)">使用工具安裝，運行，停止，卸載Window服務(wù) </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/18145" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/8.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18145';}else{window.open('/article/18145');}" style="cursor: pointer;">WSWinForm.exe介紹WSWinForm.exe是我自己開發(fā)的一個實用的小工具，用于將任何EXE程序作為Windows服務(wù)運行。也就是說WSWinForm只是其注冊程序的服務(wù)外殼，這個特性對于我們來說非常實用，我們可以通過它來安裝，運行，停止，卸載Windows服務(wù)，而不再是通過命令行InstallUtil的方式來安裝。資源下載你可以通過本文下載。應(yīng)用程序源代碼如何使用下載完軟件以后，我們能干些什么呢？看看這個截圖吧：。這里可以看到的操作：1.安裝</span> <p class="auth-span"> <span id="br5n5555bvll" class="muted"><i class="fa fa-user"></i><span id="br5n5555bvll" class="zj-icon-text">系統(tǒng)</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-29 23:02:36</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3318</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/6032" title="php示例代碼之使用list函數(shù)和mysql_fetch_row函" target="_blank" onclick="return recordId('',)">php示例代碼之使用list函數(shù)和mysql_fetch_row函 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/6032" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/13.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/6032';}else{window.open('/article/6032');}" style="cursor: pointer;"><?php//連接參數(shù)$host="localhost";$user="root";$pwd="111111";$db="test";$linkID=mysql_connect($host,$user,$pwd);//創(chuàng)建一個mysql連接if(!$linkID){echo"<fontcolor='red'>unabletoconnect!</font>";}mysql_select_db($db)ordie("unabletoselectdatabase</span> <p class="auth-span"> <span id="br5n5555bvll" class="muted"><i class="fa fa-user"></i><span id="br5n5555bvll" class="zj-icon-text">系統(tǒng)</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:52:40</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3318</span></span>  </p> </article><div id="br5n5555bvll" class="pagination" style="display:;"> <ul><li><a href="/search/date/1/p/1">首頁</a></li> <li id="br5n5555bvll" class="prev-page"><a href="/search/date/1/p/191">上一頁</a></li> <li><a href="/search/date/1/p/190">190</a></li><li><a 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