高效利用Angular中内置服务$http、$location等

$location服务用于返回当前页面的URL地址，示例代码如下：
var app = angular.module('myApp', []); 
app.controller('customersCtrl', function($scope, $location) { 
 $scope.myUrl = $location.absUrl(); 
}); 

var app = angular.module('myApp', []); 
app.controller('myCtrl', function($scope, $http) { 
 $http.get("welcome.htm").then(function (response) { 
  $scope.myWelcome = response.data; 
 }); 
}); 

app.controller('myCtrl', function($scope, $interval) { 
 $scope.theTime = new Date().toLocaleTimeString(); 
 $interval(function () { 
  $scope.theTime = new Date().toLocaleTimeString(); 
 }, 1000); 
}); 

app.service('hexafy', function() { 
 this.myFunc = function (x) { 
  return x.toString(16); 
 } 
}); 

app.controller('myCtrl', function($scope, hexafy) { 
 $scope.hex = hexafy.myFunc(255); 
});