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！
Продажа мини-погрузчиков Lonking
Продажа мини-погрузчиков Lonking на территории России от официального
дистрибьютора. Новая многофункциональная техника для любых задач.
Наши машины предназначены для того, чтобы упростить вашу работу:
от строительных площадок до складских операций.
Высокая эффективность, надежность и инновационные решения — все,
что вам нужно для успешных проектов. Погрузите свой бизнес в будущее
с мини-погрузчиками Lonking!
47% российских покупателей выбрали мини-погрузчики Lonking в 2023 году
продано более 1200 единиц.
Lonking
Another tidbit supplied in the final epilogue is that this former Hogwarts student is now teaching Herbology at his alma mater.
My buddy Ryan can be beginning a blog for his world trip, and now that I’ve basically ditched him to pursue my very own goals, the least I can do is assist him get his weblog up and operating!
Tier one solely, no purchase of the product is required.
Twelve thousand National Guards, from the 2 banks of the Rhône, promise “to stay for ever united, to insure the circulation of grain, and to take care of the laws passed by the Nationwide Meeting.” On the thirteenth of December, at Montélimart, six thousand men, the representatives of 27 000 different men, take an identical oath and confederate themselves with the foregoing.
Warehouse Chennai will be applied in cities like Chennai, all district capitals, Kodaikanal, Oddanchatram (which has the largest vegetable wholesale market in Tamil Nadu).
In 1876 he married an Ohio girl named Josephine Wright, and collectively they had raised a household of seven children, who have been, by 1906, ‘all living and all except one, the youngest, occupying positions of trust and profit’ – two of them as bookkeepers.
Brad for lending his experience to your challenge, and to assist help his ability to keep tempo with recent developments and functions of water harvesting.
We investigated extra within the lab and found that the midsole has a 30.Four HA hardness, which is 10 firmer than common.
All you have to are a few pieces of wood and slicing/drilling material to build such a desk.
Whereas the Allbirds Tree Runners proves to be an ideal companion for traveling for regular toes, we don’t suggest the shoe for many who want that additional underfoot support from the get-go.
Hike previous the most stunning waterfalls and glaciers of Torres del Paine National Park along with your information, and spot wildlife like guanacos and rhea birds along the best way.
On Nov. 1, Argentina reopened to vaccinated travelers after reporting a decrease in COVID-19 cases over 4 weeks, the government introduced.
Fastened reward window spell links not opening a spell window.
If you work at a giant firm, you might have two decisions.
Within the bathroom the addition of a mirror will give a shining look to the bathroom.
Long thought of top-of-the-line vegan eating places in town, the Sudra’s two places serve a cheerful hour featuring inventive takes on Chef Sanjay Chandrasekaran’s Indian-inspired vegan delicacies with a new Mexican twist.
These spells work because my life has been dedicated to spell casting and the pure blood programs by way of me.
Fashionable walking sneakers have arrived, and they’re getting better each day!
Great beat ! I would like to apprentice while you amend your site, how can i subscribe for a blog web site? The account helped me a acceptable deal. I had been tiny bit acquainted of this your broadcast provided bright clear idea
Throughout the chilly, the Adidas Jeremy Scott and Adidas Js Panda are particularly accepted in France and USA.
We must keep on the lookout for the sunshine, that’s waiting proper exterior the storm.
Provide and demand, folks.
If you probably did and they didn’t work, at the least you will know that your opinion is not only based on someone else’s opinion but your personal experience.
There are two kinds of GPU accessible out there.
Nonetheless, we would like to focus on ten distinct objects discovered within these book’s pages.
As we have seen, nevertheless, at the least one Breene was already a protestant by the 1640s, and held his land by to 1660.
I have not checked in here for some time as I thought it was getting boring, but the last few posts are great quality so I guess I will add you back to my daily bloglist. You deserve it my friend 🙂
The streets are also full of colorful murals painted by local artists who contribute to the brightness and wonder of Buenos Aires.
This is highly enlightening. I really valued reading it. The information is very well-organized and straightforward to understand.