#javascriptdom
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pulipuli · 5 years ago
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我會在網頁上使用SheetJS js-xlsx讀取ODS試算表檔案的內容,但最近發現檔案如果超過2.5MB,在載入檔案輸入到字串的時候,就會造成瀏覽器崩潰當機。 研究之後,我想到可以將字串建立成虛擬DOM上的節點,用來緩存過長的內容。在需要全部字串內容時,再一一從節點取得緩存即可。 以下我用兩個實際上的網頁作為例子,一個用來說明沒有緩存的過長字串導致瀏覽器當掉的情況,另一個是用虛擬DOM緩存,最後可以正常執行的情況。 系統環境 / Environment 這個實驗用的電腦環境是Windows 7的64位元版本,CPU是Intel Core i7 3770,記憶體是DDR3 16GB。瀏覽器是Google Chrome的版本 81.0.4044.122 (正式版本) (64 位元)。 如果你的硬體設備不一樣,而你瀏覽器不會當機的話,請在下面留言跟我說,感謝。 瀏覽器當掉:沒有緩存的過長字串 / Browser crashed: Long string variables with no cache 另開視窗 原始碼 這個網頁裡面的JavaScript會宣告一個out字串變數,然後加入347812747次「-」,那個「10%」就是現在加到幾次。為了避免整個畫面定住不能操作,我還加入了非同步的設計,但這跟這次的主題沒有直接關係。 我刪掉不相關的程式碼之後,主要程式碼如下: var main = async function () {  console.log('start')  var out = ''          var limit = 347812747  for (var i = 0; i 
http://blog.pulipuli.info/2020/04/javascriptdom-how-to-use-javascript-to.html
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phungthaihy · 5 years ago
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Javascript tutorial || How to access elements by ID || Web Development Classes http://ehelpdesk.tk/wp-content/uploads/2020/02/logo-header.png [ad_1] Complete Web Development Classes... #androiddevelopment #angular #c #css #dataanalysis #datascience #deeplearning #development #docker #documentobject #documentobjectmodel #documentobjectmodeldominhindi #dommodeljavascript #dommodeljs #getelementbyid #howtocreateawebsite #iosdevelopment #java #javascript #javascriptprogramminglanguage #javascriptdom #javascriptproject #javascriptselectors #javascripttutorial #javascripttutorialforbeginners #jsdocument #jsdom #jstutorial #machinelearning #node.js #python #react #technoguruamit #unity #webdesign #webdeveloper #webdevelopment #webdevelopmentcourse #websitedesign #websitedesigntutorial
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isotope32223 · 5 years ago
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2020/09/12土
週に20時間勉強したかったら6ポモ回せば一日3時間、週に21時間、一ヶ月で80時間になるのだなあ…。
午前 ・出勤時、DuolingoとDUOセクション5。 ・courseraをいじる。 ・10:20から25分、詳解JavaScriptオブジェクト編#3〜9。 ・11:05から25分、詳解JavaScriptオブジェクト編#10〜17。 ・11:35から25分、詳解JavaScriptオブジェクト編#18〜24。
午後 ・12:40から25分、詳解JavaScriptオブジェクト編#25〜31。 ・13:10から25分、DailyDectation29、詳解JavaScriptオブジェクト編#32〜35。完了。 ・13:40から25分、詳解JavaScriptDOM編(21回)、#1〜10。 ・いろいろ会社のこと。 ・16:30から25分、詳解JavaScriptDOM編(21回)、#10〜16。
帰宅 ・18:10から25分、詳解JavaScriptDOM編(21回)、#17〜21。完了。  JavaScriptでおみくじを作ろう(全9回)、#1〜2。 ・20:00から25分、JavaScriptでおみくじを作ろう(全9回)、#3〜9。完了。 ・通話しながらダラダラビンゴシート編やる。13回終了。
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rehman-coding · 4 years ago
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. . . Have anything to add? Feel free to leave your questions or ideas or just say hi in the comments :) Happy !🎉 💙🌬️❄️☃️ ———————————————————————— ⭐ CAREER CHANGE TIPS ———————————————————————— 📌 How to become a self-taught developer? ⚡ Useful links and roadmaps in my bio! ———————————————————————— 📌 Follow: @rehman_coding 💼 Portfolio: https://rehman-portfolio.netlify.app/ ⚙️ GitHub: https://github.com/MuhRehman 💎 LinkedIn: https://www.linkedin.com/in/abdul-rehman-%E2%9C%94-8611505b/ ———————————————————————— #Javascript #js#java#javascriptdeveloper #reactjs #reactdeveloper #100daysofcode #javascriptdevelopers #html5 #css3 #logicbuilding #javascriptdom #javascripttutorial #javascriptengineer #javascriptlearning #javascriptlovers #100daysofcode #100daysofcodechallenge #vscode #visualstudiocode #vscodetipsandtricks #vscodetips https://www.instagram.com/p/CQpedDWAe1W/?utm_medium=tumblr
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rehman-coding · 4 years ago
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. . . . Have anything to add? Feel free to leave your questions or ideas or just say hi in the comments :) Happy !🎉 💙🌬️❄️☃️ ———————————————————————— ⭐ CAREER CHANGE TIPS ———————————————————————— 📌 How to become a self-taught developer? ⚡ Useful links and roadmaps in my bio! ———————————————————————— 📌 Follow: @rehman_coding 💼 Portfolio: https://rehman-portfolio.netlify.app/ ⚙️ GitHub: https://github.com/MuhRehman 💎 LinkedIn: https://www.linkedin.com/in/abdul-rehman-%E2%9C%94-8611505b/ ———————————————————————— . .#Javascript #js#java#javascriptdeveloper #reactjs #reactdeveloper #100daysofcode #javascriptdevelopers #html5 #css3 #logicbuilding #javascriptdom #javascripttutorial #javascriptengineer #javascriptlearning #javascriptlover https://www.instagram.com/p/CT9eKF4g_SJ/?utm_medium=tumblr
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rehman-coding · 4 years ago
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. . . Have anything to add? Feel free to leave your questions or ideas or just say hi in the comments :) Happy !🎉 💙🌬️❄️☃️ ———————————————————————— ⭐ CAREER CHANGE TIPS ———————————————————————— 📌 How to become a self-taught developer? ⚡ Useful links and roadmaps in my bio! ———————————————————————— 📌 Follow: @rehman_coding 💼 Portfolio: https://rehman-portfolio.netlify.app/ ⚙️ GitHub: https://github.com/MuhRehman 💎 LinkedIn: https://www.linkedin.com/in/abdul-rehman-%E2%9C%94-8611505b/ ———————————————————————— #Javascript #js#java#javascriptdeveloper #reactjs #reactdeveloper #100daysofcode #javascriptdevelopers #html5 #css3 #logicbuilding #javascriptdom #javascripttutorial #javascriptengineer #javascriptlearning #javascriptlovers #100daysofcode #100daysofcodechallenge #bootstrap #objectorientedprogramming #fivver#upwork #freelance #freelancingfemales https://www.instagram.com/p/CQkQIPJASnN/?utm_medium=tumblr
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rehman-coding · 4 years ago
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#Javascript #js#java#javascriptdeveloper #reactjs #reactdeveloper #100daysofcode #javascriptdevelopers #html5 #css3 #logicbuilding #javascriptdom #javascripttutorial #javascriptengineer #javascriptlearning #javascriptlover https://www.instagram.com/p/CQe7rmGj3QZ/?utm_medium=tumblr
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simplywebstuff · 3 years ago
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JavaScript Window Object. Everything You Need To Know
JavaScript Window Object. Everything You Need To Know #javascript #javascripttutorial #javascriptdeveloper #frontenddeveloper #frontendbeginner #frontenddev #jsdev #jstutorial #learnfrontend #learnjs #learnjavascript #javascriptwindow
The window object basically represents a window containing a DOM document. A window can be the main window, a frame set or individual frame, or even a new window created using JavaScript. For example alert() method that we used in some previous tutorials to show popup messages is a method of the window object. How To Calculate Width And Height Of The Window Using JavaScript The window object…
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