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JavaScript 的性能優化：加載和執行

概覽無論當前JavaScript代碼是內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行完成。JavaScript執行過程耗時越久，瀏覽器等待響應用戶輸入的時間就越長。瀏覽器在下載和執行腳本時出現阻塞的原因在于，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</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">3258</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/26538" title="python rtree使用" target="_blank" onclick="return recordId('cid',30)">python rtree使用 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/26538" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/26538';}else{window.open('/article/26538');}" style="cursor: pointer;">安裝pipinstallRtree在使用中，可以對點線面元素進行索引，對于點用一個閾值做外包，對于線面可以求外包，有外包以后就可以把數據插入索引，然后就可以求相交和臨近。使用例子：fromrtreeimportindexclassMyIndex(object):def__init__(self,pose,distance):self.localPos=poseself.distance=distanceif__name__=='__main__':idx=</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-09-27 17:50:42</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3257</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12199" title="微軟新推TypeScript取代JavaScript" target="_blank" onclick="return recordId('cid',30)">微軟新推TypeScript取代JavaScript </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/12199" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12199';}else{window.open('/article/12199');}" style="cursor: pointer;">微軟新推TypeScript取代JavaScriptTypeScript是一個應用程序級的JavaScript開發語言。TypeScript是JavaScript的超集，可以編譯成純JavaScript。TypeScript跨瀏覽器、跨操作系統、跨主機，開源。主頁：http://www.typescriptlang.org/StartsfromJavaScript,EndswithJavaScriptTypeScript遵循JavaScript的語法和語義</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 09:30:13</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3257</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3235" title="騰訊的一道JavaScript面試題" target="_blank" onclick="return recordId('cid',30)">騰訊的一道JavaScript面試題 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/3235" 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/3235';}else{window.open('/article/3235');}" style="cursor: pointer;">//題目：分別彈出什么內容？從CSDN看到的，分享一下騰訊的一道JavaScript面試題</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:33:14</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3257</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++使用命令參數介紹" target="_blank" onclick="return recordId('cid',30)">C/C++使用命令參數介紹 </a> </h2> </header> <div id="br5n5555bvll" 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/13.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15949';}else{window.open('/article/15949');}" style="cursor: pointer;">我們從寫第一個HelloWorld程序時，就開始使用main函數。后來學到Windows編程，又開始使用WinMain函數。我們都知道每個程序都得有個主函數入口。今天就簡單介紹一下我們使用主函數時給它傳入命令參數。很早以前就想寫了，但是一直沒有找到合適的地方。今天碰到項目中的一個問題，便想起了這塊兒。。我們通常寫控制臺main都沒有帶參數，因為我們很少用到。這個命令參數的功能呢就會涉及到里面的參數?？梢赃@樣定義：intmain(intargc,char*a</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-29 22:34:59</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3256</span></span>  </p> </article><article class="excerpt"> <header> <a title="編程技術" class="label label-important zj-del-target" href="/category/30">編程技術<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12284" title="20個HTML5視頻播放器及代碼" target="_blank" onclick="return recordId('cid',30)">20個HTML5視頻播放器及代碼 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/12284" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12284';}else{window.open('/article/12284');}" style="cursor: pointer;">太給力了，20個100%Html5播放器來了。瀏覽器不需要加載flash和ActiveX，就可以渲染視頻，可以很簡單的播放視頻和控制視頻。這些播放器代碼同樣支持flash，當用戶瀏覽器不支持html5或是其他情況時，視頻可以保證正常播放。1.HTML5VideoPlayer:MediaElement.js2.JavascriptDrivenHTML5VideoPlayer:Dplayer3.HTML5Audio,VideoandImageGallery:M</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 09:30:16</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3256</span></span>  </p> </article><article class="excerpt"> <header> <a title="ASP.NET" class="label label-important zj-del-target" href="/category/56">ASP.NET<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/3988" title="今天開始學習ASP.net,ConfigurationManager提示" target="_blank" onclick="return recordId('cid',30)">今天開始學習ASP.net,ConfigurationManager提示 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/3988" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/3988';}else{window.open('/article/3988');}" style="cursor: pointer;">在web.config中配置了數據庫的連接串，但是在程中用ConfigurationManager提示找不到，無法使用，網上查了半天原來是要在程序中引用System.Configuration空間.呵呵，問題解決.例如：usingSystem;usingSystem.Collections;usingSystem.Collections.Specialized;usingSystem.Data;usingSystem.Data.SqlClient;usin</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:33:34</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3256</span></span>  </p> </article><article class="excerpt"> <header> <a title="Hive" class="label label-important zj-del-target" href="/category/59">Hive<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/2562" title="hive實戰 - qiang.xu - 博客園" target="_blank" onclick="return recordId('cid',30)">hive實戰 - qiang.xu - 博客園 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/2562" 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/2562';}else{window.open('/article/2562');}" style="cursor: pointer;">hive實戰-qiang.xu-博客園hive實戰1.安裝hive2.hive實戰3.hive存儲模型4.深入hql查詢語言5.參考資料及代碼下載<1>.安裝hive下載hive，下載地址http://mirror.bjtu.edu.cn/apache//hive/，解壓該文件：xuqiang@ubuntu:~/hadoop/src/hive$tarzxvfhive-0.7.0-bin.tar.gz設置環境變量：xuqiang@ubuntu:~/hadoo</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:32:58</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3256</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/420" title="Javascript圖像處理——閾值" target="_blank" onclick="return recordId('cid',30)">Javascript圖像處理——閾值 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/420" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/420';}else{window.open('/article/420');}" style="cursor: pointer;">前言上一篇文章，我們講解了圖像處理中的亮度和對比度的變化，這篇文章我們來做一個閾值函數。最簡單的圖像分割方法閾值是最簡單的圖像分割方法。比如為了從下圖中分割出蘋果，我們利用前景與背景的灰度差值，通過設定一個閾值，對于該像素大于這個閾值時就以黑色表示，小于便以灰色表示。五種閾值類型和OpenCV一樣，我們將提供五種閾值類型，方便使用。下面是原圖像的波形表示，縱坐標表示像素點的灰度值大小，藍線是閾值大小。二進制閾值化公式表示是：圖像表示是：可見超過該閾值的就變</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:32:03</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3256</span></span>  </p> </article><article class="excerpt"> <header> <a title="Javascript" class="label label-important zj-del-target" href="/category/66">Javascript<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/21785" title="40種網頁常用小技巧(javascript)" target="_blank" onclick="return recordId('cid',30)">40種網頁常用小技巧(javascript) </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/21785" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/21785';}else{window.open('/article/21785');}" style="cursor: pointer;">1.oncontextmenu=window.event.returnValue=false將徹底屏蔽鼠標右鍵<tableborderoncontextmenu=return(false)><td>no</table>可用于Table2.<bodyonselectstart=returnfalse>取消選取、防止復制3.onpaste=returnfalse不準粘貼4.oncopy=returnfalse;oncut=returnfalse;防止復制5.<</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-29 23:49:11</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3255</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/8511" title="mysql支持IOS的Emoji表情" target="_blank" onclick="return recordId('cid',30)">mysql支持IOS的Emoji表情 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/8511" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/12.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/8511';}else{window.open('/article/8511');}" style="cursor: pointer;">原因：UTF-8編碼有可能是兩個、三個、四個字節。Emoji表情是4個字節，而Mysql的utf8編碼最多3個字節，所以數據插不進去。解決辦法：將Mysql的編碼從utf8轉換成utf8mb4步驟：1.修改mysql配置文件my.inidefault-character-set=utf8mb4character-set-server=utf8mb42.加入[client]port=3306default-character-set=utf8mb4[mysq</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-12 01:55:14</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3255</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/18819" title="【Android 開發教程】Toast通知" target="_blank" onclick="return recordId('cid',30)">【Android 開發教程】Toast通知 </a> </h2> </header> <div id="br5n5555bvll" class="focus"> <a class="zj-del-target" href="/article/18819" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/17.jpg" alt="" title=""></a> </div> <span id="br5n5555bvll" class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/18819';}else{window.open('/article/18819');}" style="cursor: pointer;">本章節翻譯自《Beginning-Android-4-Application-Development》，如有翻譯不當的地方，敬請指出。原書購買地址http://www.amazon.com/Beginning-Android-4-Application-Development/dp/1118199545/Toast通知是Android中最簡單的消息通知。接下來展示如何使用吐司通知。1.新建一個工程，Toast。2.main.xml中的代碼。<Relativ</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</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-clock-o"></i><span id="br5n5555bvll" class="zj-icon-text">2019-08-29 23:11:24</span></span> <span id="br5n5555bvll" class="muted"><i class="fa fa-eye"></i><span id="br5n5555bvll" class="zj-icon-text">3254</span></span>  </p> </article><div id="br5n5555bvll" class="pagination" style="display:;"> <ul><li><a href="/category/30/p/1">首頁</a></li> <li id="br5n5555bvll" class="prev-page"><a href="/category/30/p/71">上一頁</a></li> <li><a href="/category/30/p/70">70</a></li><li><a href="/category/30/p/71">71</a></li><li id="br5n5555bvll" 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