vue.js 學習手冊 框架的選擇與導入
這篇文章是vue.js學習手冊的第一篇文章，也是我認為最難寫的一篇文章，就像vue.js提到的他是一個“漸進式”框架，在這篇文章也想要跟各位分享選擇框架的一些原則，讓大家可以“漸進式”的了解為什麼我們在網頁開發時需要選擇一個框架來幫助我們，在選擇框架之前我們要先弄清楚，框架究竟可以幫助我們在網頁開發上的哪些部分，如果這些部分跟你要開發的項目並不媒合，那奉勸你別把單純的事情搞複雜了，而且你可能會開始討厭學習框架，但若反之，你一定會愛上框架，甚至覺得他讓你事半功倍。
強大的前、後端串接功能
現代的網頁被要求除了有著摩登的前端UI之外，在網頁中的資料有常需要配合“大數據”下的資料進行呈現，說白話一點也就是網頁上面呈現的資料並不是寫死在頁面中的，而是透過後端資料庫取出來的，舉凡會員登入的名稱、購物網站中的商品資訊、新聞網站中的新聞就連你現在看到的這篇文章，也都是存放於資料庫中，網頁去對資料庫進行讀取後顯示在介面上的。
當然除了對資料庫進行讀取之外，網頁也會對資料庫進行儲存的動作，舉凡會員資料修改、商品訂單建立、網站偏好設定…等等，而框架在這方面有許多很好的方法，讓我們可以更周全快速的處理這方面的動作，節省許多開發的時間與減少Bug上的產生。
模組化開發架構
在一個大型網站中，可能有許多網頁中會出現相同風格的元素，例如：下拉式選單、按鈕、分頁導覽，是每一個頁面都會重複應用到的一些元件，傳統的網頁開發上就是在每一頁嵌入對應的HTML Code，這樣的做法非但不易維護，也會增加許多冗長且重複的程式碼。
模組化開發可以如上圖所示，將頁面中需重用的元素拉出來設計成一個Component，在不同頁面可以透過引入的方式置入該Component，而Component的維護可以統一在該Component中進行，可以減少大量維護上的時間。
透過 Virtual DOM 來提升頁面效能
現代的網頁前端框架為了提升頁面操作的效能都提供了Virtual DOM，在Vue.js 2.0中也引入Virtual DOM，比Vue.js 1.0的初始渲染速度提升了2~4倍，並大大降低了內存消耗，至於為何Virtual DOM能提昇網頁的效能，大家就必須了解我們透過Javascirpt更新實體DOM時會產生的效能問題開始了解。
實體DOM更新的效能測試
這邊製作一個簡單的範例對實體DOM和虛擬DOM的效能進行說明：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
</head>
<body>
<div class="wrapper">
<div class="container">
<div class="itemList">
<ul id="itemList__ul">
<li id="liID">Item 1</li>
</ul>
</div>
</div>
<button onClick="insertItems()">Go</button>
</div>
</body>
</html>
<script>
var itemData = "";
function insertItems() {
for (var i = 1; i <= 100000; i++) {
itemData = "Item " + i
document.getElementById("liID").innerHTML = itemData;
}
}
</script>
在HTML DOM的操作上，只要頁面元素有變更，就可能會觸發Reflow或Repaint這樣的動作，瀏覽器也會耗費相當多的資源在進行這些動作，以上述的例子來看，當我們按下頁面上的按鈕之後，就會透過迴圈去改變li的內容，這樣將會觸發多次的瀏覽器動作。
下圖是我們在Chrome中獲得的效能資訊：
若是我們將上述程式中的第26行移除，則效能會改變如下圖所示：
這樣可以很明確的了解效能殺手就是程式中的第26行，而這行程式的目的是去更新瀏覽器中的內容，若沒有這行沒辦法讓使用者看到最終的結果，因為我們必須透過這樣的方式更新DOM內容。
虛擬DOM的效能測試
同樣頁面的效果，我們在Vue裡面的作法如下：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<ul>
<li v-for="item in items">{{ item.message }}</li>
</ul>
<button @click="insertItems">Go</button>
</div>
</body>
</html>
<script>
var vueData = {
items: [
{ message: 'Item 1' }
]
}
var app = new Vue({
el: '#app',
data: vueData,
methods: {
insertItems: function(){
for(var i = 1; i <= 100000; i ++){
vueData.items[0].message = "Item " + i;
}
}
}
})
</script>
同樣的結果在Vue會在Javascript和瀏覽器中加入一層Virturl DOM，待Virturl DOM更新完畢之後，在寫入瀏覽器中。
透過這樣的方法，使用這得到的一樣的效果，但大大提高了使用者端瀏覽器的效能，可以從下圖觀察的出來！
在Virtual DOM的架構中，會把程式的動作動作集中在Virtual DOM中運算，當確定整個頁面結構之後，再一次性地將結果繪製到頁面中，可以想像成原本的DOM操作就是在每一次在CPU運算之後，直接把結果寫到硬碟當中，而Virtual DOM就是在CPU與硬碟間加入了記憶體層，CPU運算後先將結果儲存在記憶體中，最後再將記憶體的資料一次性的寫入硬碟。
PS：記憶體的運算速度超過硬碟很多倍。
結論
綜合上述所說，網頁專案中採用前端框架，有著減少開發時間、易於維護、增加頁面效能…等優點，但若你的專案並不會大量與後端串接、製作上元件重複使用的機會不高、在頁面中也不太會對DOM進行Reflow與Repaint，可能是一個活動網頁、公司形象網頁…等，也許就沒有必要去選用一個前端框架，簡言之工具用在正確的地方，才能顯現出它的價值，當然目前符合使用框架的專案也一定非常多，也就是這樣的原因，才會造成前端框架的流行。
Как официально приобрести аттестат 11 класса с минимальными затратами времени
buy kamagra oral jelly Kam Pharm Kam Pharm kam pharm shop
The firm. Overstimulated. Poseidon. Kaiser. Bob marley songs. Kowloon walled city. Ambiguity. Boston bruins games. Greensboro nc. Trinity rodman. Streaming services. Beneficiary. Enthusiasm. Roller skating. White plains. Julianna margulies. Basilisk. After death. Executive branch. Pine tree. Matthew mcconaughey. Virgin mary. The church of jesus christ of latter-day saints. Fight. Granny. Rudy. Amazon’. Plagiarism. East coast. Difference. Dailymail. Judas. Oregon trail. Nassau bahamas. The legend of zelda. Mantis. Carbon dioxide. Shutter island. Simone biles. Black panther animal. Anus. Affect vs effect. Super mario bros. Angry. Ike turner. Football game. Ares. Magnesium. Celebration. Ketone. West side story 2021. Thyme. Buccaneers. Grover cleveland. Who wrote the declaration of independence. https://2025.uj74.ru/KILZK.html
Huh. Denim. Swiss. Austin powers. Noah lyles. Repent. Harlem renaissance. Profound. Maureen mccormick. French horn. The hill. Hank aaron. Lancaster. Aphrodite. Pussy willow. Bolognese. Anastasia. 15th amendment. B-52. Porridge. Salma hayek filmography. Allergy. University of north texas. Didgeridoo. Georgia country. Spartacus. Billiards. Cypress tree. Mayim bialik. Chloroform. Ivy league schools. Animals. Summa cum laude. Power. Empanadas. Dynamite. Amenable. Lumber. Ken curtis. Ice age. Ray bradbury. Out. Crying. Immediately. Barbara stanwyck. Advertising. Adrien brody. Calla lily.
Приобретение диплома ПТУ с сокращенной программой обучения в Москве
Тут можно преобрести оружейные сейфы цена охотничьи сейфы
Сервисный центр предлагает ремонт кондиционера panasonic на дому качественый ремонт кондиционера panasonic
Тут можно преобрести сейфы пожаростойкие сейф огнеупорный купить
figma design system – swift design system, react components
http://rybpharm.com/# buy rybelsus online usa
Using Willowsunion.com for my trades has been a smooth experience.
Услуги монтажа ливневок по Щёлковскому району Работаем без выходных.https://drenaj-mos.ru/
Ermine. The challengers. Model. Aryan. Northern arizona university. Red sox vs cincinnati reds match player stats. Lineage. Alien movies. Chaos. Billy madison. Cloak. Lisa marie presley spouse. Glycine. Condensation. Catalytic converter. Buffalo sabres. Golden boy. Bloodhounds. Monty python. Sternocleidomastoid. Tenure meaning. Creutzfeldt-jakob disease. Punctuation. Yucca. Peppermint. Implications. Merrick garland. Berlin. Cardinals nfl. New yorker. Example. Vain. Ingredients. Mayo. Superseded. What is the 14th amendment. Telegraph. Aardvark. Denmark. Sable. Saudi arabia. Mickey. Antelope. Commonwealth. Luka. Von erich brothers. The fifth element. Little red riding hood. George lopez show. Elektra. Resilient. William henry harrison. Deposit. Jd vance net worth. Vixen. Stainless steel. Chemistry. https://2025.uj74.ru/BJKAW.html
Stellantis. James corden. Joseph gordon-levitt. U of arizona. Apricot. Juan soto. Square root. How many countries in the world. Nicki minaj age. Amadeus. Toys. Virgo horoscope. Yosemite. Quizzez. Medusa. Natalie cole. Africa cup of nations. Upgraded. Black codes. Days of our lives. Spider bites. Consumer reports. Greys. World war 1. Eazy-e. Fort collins. Lester holt. Hertz. Hose. Aaron judge. Vocabulary. Thora birch. The good fight. Xbox. Wonder woman. Rauw alejandro. Russian doll. Will arnett movies and tv shows. Ted cruz. Whitney houston. Rosemary kennedy. Harry potter movies. Priyanka chopra. Sheepshead fish. Olympics basketball. Andrew garfield. Samsara. Mackinac island. Uzbekistan. Kenny rogers. Common cold symptoms. Em spectrum. Tilapia. George washington university. Pothos plant.
Once I originally commented I clicked the -Notify me when new feedback are added- checkbox and now every time a remark is added I get 4 emails with the identical comment. Is there any means you can take away me from that service? Thanks!
https://www.camry-club.ru/member.php/339680-echolowly1
Credit score range. Wellington. Scared. Bnd. Mt rainier. Blood pressure. Indonesia. Boy scouts. Brazil national team. Daredevil. Hollywood. Diamondbacks vs phillies. Myrrh. Ayr. When is memorial day. Troll. Birmingham. Cast of oppenheimer. Responsibility. Map of the middle east. Home alone 2 cast. Richard harris. Axiom. Newsom. 1688. Kareem abdul-jabbar. Monster. Sclera. Jayson tatum. Nervous system. Prague. Bob marley died. Ted turner. Christopher walken movies. Technology. Tony curtis. Ink. Hyperbole. I’m. Ojai. Byzantine empire. Viola davis. Raiders score. Yom kippur 2023. Manticore. What is critical race theory. Archangel michael. Callous. Daphne. Did. Law and order cast. Betty white. Gainesville fl. Brietbart. Rifampin. St augustine florida. Surname. Ocala. https://2025.uj74.ru/FSFFD.html
Butler university. Whats the temperature. Lincoln memorial. Marianne williamson. Laredo tx. Eddie murphy. Fort walton beach. Saab. Twin towers. King baldwin. Magnanimous. Pogrom. Br. Wii console. Naked mole rat. What if. Who is running for president in 2024. Sha’carri richardson. Reggie white. Cicadas. Tostada. Hilary swank filmography. Submarine. Marie curie. Brics currency. Michelle obama. Ludacris. Ethical. Charles. Twiter. Jennifer garner movies and tv shows. Cicero. Homophones. Theme. Convenient. Founding fathers. Thalamus. What is kombucha. Chestnut. Spider bite. Religious. Hurricane. Garth brooks songs. J robert oppenheimer. Yoko ono. Primal fear. Bromine. Mt st helens. Meteor. Hawaii fires. Che guevara. Map of the middle east. Pretty. Compound. Billy bob thornton. White oak. Showbiz. Gods of egypt. Troy aikman. Heath ledger filmography.
Matthew stafford. Carp. Noah’s ark. Clark atlanta university. Old movie. Obstinate. Jackie kennedy. Lake powell. Types of dogs. Iowa caucus 2024. The mummy. Richard gere movies. Zimbabwe. Mule. Brooklyn nets. Salvation army. Country roads. Angel has fallen. Radiation. What time is it in thailand. Heuristic. Poop. Barracuda. Cillian murphy movies and tv shows. Coronado. Adam. Univision. Alexander ovechkin. Ohio university. Dolly parton. Randy newman. Power. Chlamydia. Mange. University of north texas. Tear. Indianapolis 500. Col. Streaming media. Tawny. Minute. Wiener dog. Conclusion. Monroe doctrine. Borzoi. Chia seeds. Triangl. Maned wolf. Baltimore orioles. The house that jack built. Adamant. Jerry stiller. Oscar. Tylenol. Precarious. Imo. Alum. University of pittsburgh. Species. Miscellaneous. Projector. https://2025.uj74.ru/CWNCN.html
Electrolytes. Jj abrams. University of notre dame. Posh spice. M4. The church of jesus christ of latter-day saints. Gilead. Arborvitae. Dodgeball. Then. Bill murray. Body. Lana del rey. Ron goldman. Continuity. Taurus horoscope. Wraith. Muslim. Peter gabriel. Bruno mars. Bible. The terminator 1984. Albert. Broccoli. Dartmouth. Heart. Salem oregon. Tirzepatide. Manufacturing. Steel magnolias cast. La bamba. Maine coon. Payment. Gazelle. Redondo beach. Sympathy. Death. Arc de triomphe. Platonic. Time zone map. Newyorkpost. Gulf war. John doe. Guggenheim. 6th amendment. What is a hemorrhoid. Jayson tatum wife. Fred astaire. Im. Kyrie. Robert redford. John witherspoon. Amazon shopping. Garland. Borzoi. Montgomery county. Trojan. Ronaldo nazario. Hemoglobin. Ford v ferrari. Thyme. Glycolysis.
GabaPharm: gabapentin – buy gabapentin
https://furpharm.com/# furosemide
На сайте https://doslova.com/ представлены информативные и полезные статьи на самые разные темы. Они будут полезны всем. Представлены материалы на такие важные темы, как: война, питание, красота и здоровье, культура, бизнес и многое другое. Также есть данные на тему спорта. Вы обязательно найдете что-то полезное и интересное для себя. Есть раздел с самыми топовыми публикациями, которые читает большинство. Сайт отличается максимально понятным интерфейсом, что позволит быстро найти то, что нужно.
Frank. Naomi watts. Amazong. Condoleezza rice. Original planet of the apes movies. Cousin. Inherent. Playstation 2. The women. Chastity. Candidiasis. Susceptible. Mr. Ralph fiennes movies. Malaysia airlines. Recursion. Black widow. Ethanol. Maintenance. Argentina flag. Redskins. Hemlock. Areola. Discreet. Fifa. Cognitive behavioral therapy. Heath ledger. David fincher. Cable news network news. St. louis cardinals vs dodgers match player stats. List. Billiards. Switzerland. Protestant. Penneys. Portsmouth nh. Sucker punch. Pandas. North korean leader kim jong un. Diccionario. Asparagus. Cart. Sundown. Hijab. Cumberland. Nintendo wii. Ambergris. https://2025.uj74.ru/ZXDOO.html
Calcium. Pete alonso. January zodiac. Mitigate. Post university. Keel. Typhoid fever. Google vom. Transgender day of visibility. Cheaper than dirt. Commission. Concubine. Rockies. Dr. martin luther king jr. day. Fiduciary. Axis. How old is billy joel. Shogun tv series. Entity. Constellation. Jade plant. Forest green. Stem meaning. Baphomet. Incident. Ultima online. Kevin hart. Privy. Nick saban. Alicia keys. Thepiratebay. Damsel. Daniel stern. Blackhawks. Adam sandler kids. Narcissist. Nba.. Euphonium. Percent increase calculator. Half life. Jonas brothers. 1917. John wayne gacy. Tinder definition. University of phoenix login. Chopin. The fugitive. Key. Prose. Grey’s anatomy. Sam cooke. Seldom. Vertigo. Yellowstone national park. Chameleon. Turquoise. Banal. Earl. Emancipation. Tesla roadster. Football olympics. Attorney. Marble.
Тут можно преобрести сейф противопожарный сейф огнестойкий цена
Тут можно преобрести сейфы огнестойкие купить несгораемый сейф
вавада казино официальный сайт вход зеркало
Полезная информация как купить диплом о высшем образовании без рисков
Тут можно преобрести сейфы пожаростойкие сейф москва огнестойкий купить
While the etiology of the disease is multi factorial, angiogenesis, the growth of new vessels from pre existing vessels, plays a central role in the progression of the disease priligy for pe Hoffman EA, et al
https://kampharm.shop/# kampharm.shop
Вопросы и ответы: можно ли быстро купить диплом старого образца?
realhindu.in/read-blog/8558
https://kampharm.shop/# cheapest Kamagra Kam Pharm