# AngularJS XMLHttpRequest
**$http** 是 AngularJS 中的一个核心服务，用于读取远程服务器的数据。
## 读取 JSON 文件
以下是存储在web服务器上的 JSON 文件：
http://www.w3cschool.cc/try/angularjs/data/Customers_JSON.php
```
[
{
"Name" : "Alfreds Futterkiste",
"City" : "Berlin",
"Country" : "Germany"
},
{
"Name" : "Berglunds snabbk?p",
"City" : "Lule?",
"Country" : "Sweden"
},
{
"Name" : "Centro comercial Moctezuma",
"City" : "México D.F.",
"Country" : "Mexico"
},
{
"Name" : "Ernst Handel",
"City" : "Graz",
"Country" : "Austria"
},
{
"Name" : "FISSA Fabrica Inter. Salchichas S.A.",
"City" : "Madrid",
"Country" : "Spain"
},
{
"Name" : "Galería del gastrónomo",
"City" : "Barcelona",
"Country" : "Spain"
},
{
"Name" : "Island Trading",
"City" : "Cowes",
"Country" : "UK"
},
{
"Name" : "K?niglich Essen",
"City" : "Brandenburg",
"Country" : "Germany"
},
{
"Name" : "Laughing Bacchus Wine Cellars",
"City" : "Vancouver",
"Country" : "Canada"
},
{
"Name" : "Magazzini Alimentari Riuniti",
"City" : "Bergamo",
"Country" : "Italy"
},
{
"Name" : "North/South",
"City" : "London",
"Country" : "UK"
},
{
"Name" : "Paris spécialités",
"City" : "Paris",
"Country" : "France"
},
{
"Name" : "Rattlesnake Canyon Grocery",
"City" : "Albuquerque",
"Country" : "USA"
},
{
"Name" : "Simons bistro",
"City" : "K?benhavn",
"Country" : "Denmark"
},
{
"Name" : "The Big Cheese",
"City" : "Portland",
"Country" : "USA"
},
{
"Name" : "Vaffeljernet",
"City" : "?rhus",
"Country" : "Denmark"
},
{
"Name" : "Wolski Zajazd",
"City" : "Warszawa",
"Country" : "Poland"
}
]
```
## AngularJS $http
AngularJS $http 是一个用于读取web服务器上数据的服务。
$http.get(url) 是用于读取服务器数据的函数。
## AngularJS 实例
```
<div ng-app="" ng-controller="customersController">
<ul>
<li ng-repeat="x in names">
{{ x.Name + ', ' + x.Country }}
</li>
</ul>
</div>
<script>
function customersController($scope,$http) {
$http.get("http://www.w3cschool.cc/try/angularjs/data/Customers_JSON.php")
.success(function(response) {$scope.names = response;});
}
</script>
```
应用解析:
AngularJS 应用通过 **ng-app** 定义。应用在 <div> 中执行。
**ng-controller** 指令设置了 **controller 对象** 名。
函数 **customersController** 是一个标准的 JavaScript **对象构造器**。
控制器对象有一个属性: **$scope.names**。
**$http.get()** 从web服务器上读取静态 **JSON 数据**。
服务器数据文件为： [**http://www.w3cschool.cc/try/angularjs/data/Customers_JSON.php**](/try/angularjs/data/Customers_JSON.php)。
当从服务端载入 JSON 数据时，**$scope.names** 变为一个数组。
> 
> 以上代码也可以用于读取数据库数据。
