angularJs学习笔记－入门_html/css_WEB-ITnose
1.angularJs简介
angularJs是一个MV*的javascript框架（Model-View-Whatever,不管是MVVM还是MVC，统归MDV（model drive view））,其实是由google推出的SPA(single-page-application)应用框架。它的用于 数据在后端和前端之间的双向绑定。这就意味着你在后台改变数据，这些变动立刻就会出现在view上。
在加载的时候，angular会将你的dom树和javascript转向一个angular app 。包含着angular指令和过滤器的html会被编译成一个树图，响应的范围和控制器会被附加在这个树上，内部的应用循环确保了视图和模型之间的数据绑定。每次模型被更新（可以通过ajax请求，也可以直接操作控制器），angular会重新运行它的 $digest循环，跟新数据绑定确保所有东西是同步的。
js代码是用一种命令的方式操作dom。而在angular中，直接操作dom是不被提倡的。dom由视图管理，data在scope中，方法在控制器里。
3. ng-app
(1)代码预览，引入angular文件
（2）游览器里效果
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <body> <div class="" ng-app> hello{{'world'}} </div> </body></html>
4. ng-model
(1)代码预览
（2）游览器里效果
(3)源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <body> <div class="" ng-app> your name : <input type="text" name="name" value="" ng-model="yourname" placeholder="angular"> <hr> hello {{yourname || 'angular'}} </div> </body></html>
5.ng-controller
(1)代码预览
（2）游览器效果
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>hello cynthia</title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <script type="text/javascript"> var app = angular.module('app',[]); app.controller('helloCynthia',function($scope){ $scope.eleName = "cynthia" }) </script> <body> <div class="" ng-app='app' ng-controller='helloCynthia'> hello,{{eleName}} </div> </body></html>
6.ng-repeat
(1)代码预览
（2）游览器效果
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <script type="text/javascript"> var app = angular.module('ngrepeat',[]) app.controller('ngrepeatCtr',function($scope){ $scope.developers=[ {name:'wuqian',country:'china'}, {name:'cynthia',country:'usa'}, {name:'wupore',country:'canada'}, {name:'selene',country:'english'} ] }) </script> <body> <div class="" ng-app='ngrepeat' ng-controller='ngrepeatCtr'> <ul> <li ng-repeat='person in developers'> {{person.name}} from {{person.country}} </li> </ul> </div> </body></html>
7.example
(1)代码预览
（2）游览器效果 （用户在input里输入后，点击button，在下方显示输入,但是目前显示undefined。。。）
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <script type="text/javascript"> var app = angular.module('appName',[]); app.controller('controllerName',function($scope){ $scope.clickName = function(){ $scope.message = 'Name : ' + $scope.userInput; } }) </script> <body> <div class="" ng-app='appName' ng-controller='controllerName'> <p> what's your name ? </p> <br> <input type="text" name="name" placeholer="input your name here" ng-model＝‘userInput’> <button type="button" name="button" ng-click='clickName()'>click here</button> <h3 id="message">{{message}}</h3> </div> </body></html>
8.filters 过滤器
angular提供的过滤器和unix中的管道pipeline相似。比如我们要在网页中显示价格$可以这样写
（1）源码预览
（2）游览器中效果
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <body> <div class="" ng-app> <span>iphone : {{63573 | currency}}</span> </div> </body></html>
9.利用filters做删选
（1）代码预览
（2）游览器效果
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <script type="text/javascript"> var app = angular.module('ngrepeat',[]) app.controller('ngrepeatCtr',function($scope){ $scope.developers=[ {name:'wuqian',country:'china'}, {name:'cynthia',country:'usa'}, {name:'wupore',country:'canada'}, {name:'selene',country:'english'} ] }) </script> <body> <div class="" ng-app='ngrepeat' ng-controller='ngrepeatCtr'> <input type="text" name="name" value="" ng-model='search'> <ul> <li ng-repeat='person in developers | filter:search'> {{person.name}} from {{person.country}} </li> </ul> </div> </body></html>
10.自定义filter
(1)代码预览
（2）游览器效果（首字母变大写）
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>hello cynthia</title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <script type="text/javascript"> var app = angular.module('app',[]); // 自定义filter app.filter('capt',function(){ return function(input,param){ return input.substring(0,1).toUpperCase()+input.substring(1); } }) </script> <body> <div class="" ng-app='app'> <span>{{'this is some text' | capt}}</span> </div> </body></html>
11.services
在controller之间共享数据对我们是很有用的，但是每个controller都有自己的scope，所以我们不能将其绑定到其他的controller上。为此angular提供了的解决方案是services。
angular内置了很多services，比如http请求、异步promises编程模式。这也是angular的核心（依赖注入）的关键。
services都是单例的，也就是说在一个应用里，每个service对象只会被实例化一次。它主要负责提供一个接口把特定的函数需要的方法放在一起。最常见的方法是angular.module API的factory方式：
例子：通过services实现oneCtrl和twoCtrl之间共享一个数据 user
（1）源码预览
（2）游览器里面效果
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>hello cynthia</title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <script type="text/javascript"> var app = angular.module('app',[]); // 通过services实现oneCtrl和twoCtrl之间共享一个数据 user app.factory('userInfor',function(){ var user={ name : 'Angular.js' } return user; }) app.controller('oneCtrl',function($scope,userInfor){ $scope.user = userInfor; }) app.controller('twoCtrl',function($scope,userInfor){ $scope.user = userInfor; }) </script> <body> <div class="" ng-app='app'> <div class="" ng-controller='oneCtrl'> oneCtrl : <input type="text" name="name" value="" ng-model='user.name'> </div> <div class="" ng-controller='twoCtrl'> twoCtrl : <input type="text" name="name" value="" ng-model='user.name'> </div> </div> </body></html>
12.ng-show 和 ng-hide
(1) 源码预览
（2）游览器里效果：点击按钮下面的内容出现／隐藏
（3）源码
<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title></title> <script src="../build/angular.min.js" charset="utf-8"></script> </head> <body> <div class="" ng-app> <button type="button" name="button" ng-init='shouldShow=true' ng-click='shouldShow = !shouldShow'>Flip the shouldShow variable</button> <div class="" ng-show='shouldShow'> <h3 id="showing-shouldShow">showing {{shouldShow}}</h3> </div> <div class="" ng-hide='shouldShow'> <h3 id="hiding-shouldShow">hiding {{shouldShow}}</h3> </div> </div> </body></html>
13.
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