AngularJS – 跟著Google玩網頁！
今天馬老師要與大家分享的是一個前端開發的函式庫AngularJS，前面的文章中都有提到，因為近年來行動裝置的普及讓Javascript大為活躍，不過傳統的Javascript在相容性上、操作上都非常的不方便，所以才有了許許多多Javascript的函式庫與框架的誕生，例如：jQuery、KnockoutJS、GSAP、PaperJS…等，每個Javascript的函式庫和框架的大小、作用和目的都不盡相同，有的是為了特效；有的則是為了方便操作，那今天為何要跟大家分享AngularJS呢？因為…它是名牌！
為何說AngularJS是名牌呢？因為目前他是由Google來負責維護。初始版本是在2009年誕生的，比jQuery晚了三年，言下之意就會比jQuery好嗎？當然也不能這麼說，jQuery在目前還是一個非常火燙的前端開發函式庫，應該要說他們兩個在使用的架構和目的上會有所不同，這篇文章也來比較一下同樣的案例，在兩種語法上面撰寫的不同。
不過首先我們要知道基本的AngularJS開發方式，今天的案例我們利用JS Bin的線上開發網頁來說明，大家也可以到這個平台上來試著玩看看！如果需要利用AngularJS開發自己的網頁，也可以到AngularJS的官方網頁把JS下載到資料夾之後引用到網頁裡。
1. 首先點選Add library後選擇AngularJS Stable，這樣該平台就會加入AngularJS的函式庫進入頁面。
2. 在標籤中，加入ng-app的屬性，讓整份文件都可以使用AngularJS。
3. 接下來就可以在左手邊body標籤內開始輸入一些程式碼來測試，AngularJS在輸出方面有個基本的結構式「{{ }}」，大家輸入以下的程式碼來測試看看結果：
<!DOCTYPE html>
<html ng-app>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<p>{{ '馬老師雲端研究室' }}</p>
<p>35+62={{ 35+62 }}</p>
<p>NT{{ 62000 | currency }}</p>
</body>
</html>
可以看到輸出的結果應該是：（在JS Bin上面看AngularJS輸出結果）
馬老師雲端研究室 35+62=97 NT$62,000.00
同樣的如果我們要利用jQuery來完成這樣的頁面，程式碼就會變成：（在JS Bin上面看jQuery輸出結果）
<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<p></p>
<p></p>
<p></p>
</body>
</html>
<script>
$("p:eq(0)").text('馬老師雲端研究室')
$("p:eq(1)").text('35+62=' + (35 + 62))
$("p:eq(2)").text('NT' + (numeral(62000).format('$ 0,0.00')))
</script>
請注意，為了要完成第三項貨幣型式的呈現，我們還必須去引用這個網站的jQuery Plugin才有辦法比較輕鬆的實現。從上面的案例可以看的出來jQuery是由HTML DOM來抓到對象，再針對對象做操作，而AngularJS不管顯示的效果為何，就是在需要有程式運算的地方出現，所以AngularJS也被稱為符合MVC結構的Javascript函式庫（MVC是一種寫程式的結構，全名是Model View Controller，大家可以上網Google就可以查到很多與MVC相關的資料），但如果你有進入官網，可以看到官網上他的標題是「AngularJS – Superheroic JavaScript MVW Framework」，翻譯成中文大概是「AngularJS是一個符合MV…Whatever什麼什麼隨便啦！的超級函式庫」，可以看出Google的惡搞功夫。
再來示範第二個案例，本案例利用購物行為來製作相關的頁面讓大家參考，程式碼如下：
<!DOCTYPE html>
<html ng-app>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body ng-init="stock=120;price=325;quantity=1;total=0">
<p>馬老師雲端研究室 滑鼠墊</p>
<p>剩餘：<span ng-model="stock">{{ stock-quantity }}</span>個</p>
<p>單價：<span ng-model="price">{{ price | currency:"NT$":0 }}</span>元</p>
<p>數量：<input type="number" min="0" max="{{ stock }}" ng-model="quantity"></p>
<p>總金額：<span ng-model="total">{{ price*quantity | currency:"NT$":0 }}</span></p>
</body>
</html>
輸出結果：（在JS Bin上面看AngularJS輸出結果）
在這個案例裡面有四個項目，分別是商品剩餘數量、單價、數量、總金額，使用者唯一可以改變的只有數量，但頁面中會自動運算剩餘數量和總金額，其中在語法body標籤中，加上了ng-init屬性，代表設定這幾個項目的預設值，stock（剩餘數量）120個、price（單價）325元、quantity（數量）1個，total（總金額）325元。接下來在span內的ng-model就是去綁定該定義項目，{{ }}則是顯示該項目或運算結果，另外貨幣格式的部分，也是用了一些設定讓貨幣在這個案例裡面顯示得更為接近台幣格式，另外還是用HTML5 input標籤的min和max來限制欄位內的值。 而這個案例如果轉換為jQuery的寫法，大概會是下面這樣子：（在JS Bin上面看jQuery輸出結果）
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<p>馬老師雲端研究室 滑鼠墊</p>
<p>剩餘：<span id="stock"></span>個</p>
<p>單價：<span id="price"></span>元</p>
<p>數量：<input type="number" min="0" ng-model="quantity" id="quantity"></p>
<p>總金額：<span id="total"></span>元</p>
</body>
</html>
<script>
var stock = 120;
var price = 325;
var quantity = 1;
var total = 325;
$("#stock").text(stock) $("#price").text('NT' + (numeral(price).format('$ 0,0'))) $("#quantity").val(quantity).attr(
"max", stock) $("#total").text('NT' + (numeral(total).format('$ 0,0'))) $("#quantity").change(function () {
quantity = $(this).val() newstock = stock - $(this).val() total = price * $(this).val() $("#stock").text(
newstock) $("#price").text('NT' + (numeral(price).format('$ 0,0'))) $("#total").text('NT' + (
numeral(total).format('$ 0,0')))
})
</script>
後記：以上兩個案例示範的是jQuery和AngularJS在撰寫頁面的不同，不過因為這篇文章原本就是要以AngularJS為主，所以挑的案例當然會是AngularJS比較佔優勢的內容，還是跟我常說的一樣，做不同的東西就要用不同的工具，用錯了工具不是做不到，但可能是會事倍功半的！另外文章中的程式碼，都是嵌入遠端的JS檔，所以也可以把整個程式碼複製到你熟悉的網頁開發軟體內，一樣會看到同樣的結果喔！
https://naveridbuy.exblog.jp/37152083/
https://writeablog.net/37n5a9w9yv
This article is fantastic! Filled with valuable insights and extremely articulate. Thanks for offering this.
https://candid-lion-dd3cm3.mystrikingly.com/blog/2024
https://sociable-corn-dd3cmt.mystrikingly.com/blog/632534d0cfc
indohoki77
dunia77
https://medium.com/@nsw5288/%EB%B9%84%EC%95%84%EA%B7%B8%EB%9D%BC-%EA%B5%AC%EB%A7%A4-%EC%82%AC%EC%9D%B4%ED%8A%B8-be7ed9932b6f
May I just say what a relief to uncover an individual who really knows what they are talking about online. You definitely realize how to bring a problem to light and make it important. More people should look at this and understand this side of the story. I was surprised that you aren’t more popular given that you definitely possess the gift.
https://naveridbuy.exblog.jp/35659159/
https://xn--w7-hs1izvv81cmb366re3s.mystrikingly.com/blog/vs
Hi to all, how is everything, I think every one is getting more from this site, and your views are fastidious for new viewers.
смотреть сериалы онлайн бесплатно без регистрации
Spot on with this write-up, I actually feel this site needs a great deal more attention. I’ll probably be returning to read through more, thanks for the information.
The window is in reminiscence of William McConnell who died in 1902 aged 93 and his wife Margaret Bradshaw McConnell who died in 1881 at the age of 57.
Franklin of William’s arrest and transferral to Connecticut.
Your sales workforce members and other workers should be supported with such incentive journeys.
For Halloween Horror Nights 14 in 2004 the resort experimented with a twin-park format, which related and utilized components of both parks.
On January 19, 2021, Xiaomi introduced Mi Talk would be discontinued in a message despatched to all customers, with the messaging performance of the app being disabled on February 1 the identical 12 months.
Greetings! This is my first visit to your blog! We are a collection of volunteers and starting a new project in a
community in the same niche. Your blog provided us useful information to work on. You have done a extraordinary job!
Also visit my blog post – site tonic greens
ICH WOLLTE FRÜHER WIE OLLI KAHN WERDEN”” (in German).
From the navy park, guests can get pleasure from panoramic views of Moccasin Bend and the Chattanooga skyline from the mountain’s famous “level” or from vantage points along the effectively-marked trail system.
I wanted to thank you for this very good read!! I certainly loved every bit of
it. I’ve got you book-marked to look at new stuff you post…
Also visit my page is fitspresso legit
CapCut представляет собой современным инструментом для монтажа, который изменил подход в сфере видеомонтажа. Представленный как в браузерной версии через capcut.com, так и в виде приложения для PC и мобильных устройств, он обеспечивает профессиональные возможности монтажа для авторов любого уровня. Больше информации о функционале можно найти тут https://aggam.xyz/ и в официальных соцсетях.
Главным достоинством CapCut является богатая коллекция встроенных заготовок, которые помогают даже неопытным пользователям монтировать эффектные видео в быстром темпе.
Платформа постоянно развивается – от стандартной версии до продвинутой CapCut Pro, предлагая пользователям новые инструменты и варианты монтажа.
Буду счастлив оказать помощь в любых вопросах по вопросам capcut на русском языке – пишите в Telegram ngq08
Hoi, dit is een reactie.
Om te beginnen met beheren, bewerken en verwijderen van reacties, ga je naar het Reacties scherm op het dashboard. https://pxman.net
Having read this I believed it was really enlightening. I appreciate you spending some time and effort to put this short article together. I once again find myself personally spending a significant amount of time both reading and leaving comments. But so what, it was still worthwhile.
Clients also can benefit from reductions once they bundle multiple policies and decide into the company’s further coverage options resembling identification theft safety.
What an enlightening post! I learned a lot from perusing it. The content is very well-organized and easy to comprehend.
Neva E. Lefler and grandson of William & Belle (Everingham) Stoner of Onaway.
In 1962, Dr. White accepted the place of supervisor of Vocational Agriculture in Area II.
George GRAHAM, pastor of the primary United Methodist Church, officiating.