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！
http://farmatadalitaly.com/# comprare farmaci online all’estero
comprare farmaci online con ricetta
http://farmasilditaly.com/# viagra originale recensioni
farmacia online piГ№ conveniente
http://farmatadalitaly.com/# п»їFarmacia online migliore
acquistare farmaci senza ricetta
It’s awesome designed for me to have a web site, which is useful in support of my knowledge.
thanks admin
Also visit my site … geekshealth.com/fitspresso-reviews
https://farmatadalitaly.com/# Farmacia online miglior prezzo
comprare farmaci online all’estero
https://cytpharm.shop/# buy cytotec in usa
how to get prednisone tablets
I’m truly enjoying the design and layout of your site.
It’s a very easy on the eyes which makes it much more enjoyable for me to come here and visit more often. Did you hire out a designer to create your theme?
Excellent work!
my page – nitric boost ultra official website
http://dappharm.com/# buy priligy
buy prednisone mexico
When someone writes an paragraph he/she keeps the idea of a user in his/her brain that how a user can know it.
So that’s why this paragraph is outstdanding.
Thanks!
Feel free to surf to my homepage :: sight care fast
https://kamapharm.shop/# Kama Pharm
prednisone online for sale
Microsoft says that the hype surrounding the video was completely unexpected.
This allows it to be much less messy and for the option to be uniformly applied when you
attack down.
azithromycin drug – zithromax pill bystolic 5mg us
http://kamapharm.com/# Kama Pharm
prednisone rx coupon
http://kamapharm.com/# Kama Pharm
buy prednisone 50 mg
It is a privately-owned franchiser of residence-primarily based journey agencies with over 2500 franchises.
Creating temper boards can even assist visualize and refine your own gothic looks.
Duration is a linear measure of how the price of a bond changes in response to interest rate changes.
Most analysis chefs are educated in culinary arts, however may need one other degree in chemistry or basic science.
As per the standard: “An equal month is presumed to have 30.41666 days (i.e. 365/12) no matter whether or not it’s a leap 12 months.” The result is to be expressed to at least one decimal place.
We’re a great distance from being able to create a recreation by which gamers are truly free to do no matter they need – believe me, there’s plenty of illusion in Deus Ex – but we knew we wished to start taking a minimum of some steps on the street to player management.
When the unemployment fee is above 5.5, these who’re out of labor cut back on expenditures, reducing demand for items and providers.
https://kamapharm.shop/# sildenafil oral jelly 100mg kamagra
prednisone 20mg tab price
This is my first time pay a quick visit at here and i am truly impressed to read
everthing at alone place.
My web blog … p1957171
Undeniably believe that which you said. Your favourite reason seemed to be at the net
the easiest factor to understand of. I say to you, I certainly get irked even as folks consider issues that they just don’t realize about.
You controlled to hit the nail upon the highest and
also outlined out the whole thing without having side effect , other people could take a signal.
Will likely be again to get more. Thanks
Here is my page: prodentim hoax
Hi, yes this paragraph is actually nice and
I have learned lot of things from it about blogging. thanks.
my webpage: p1956752
Hello colleagues, how is the whole thing, and what you desire to say on the topic of this article, in my view its
truly remarkable designed for me.
my homepage :: get fitspresso coffee loophole
https://predpharm.com/# 10mg prednisone daily
prednisone oral
Introducing to you the most prestigious online entertainment address today. Visit now to experience now!
A main goal of risk communication is to improve collective and individual decision making.