Angular Provider中的依賴注入

Question

我想知道是否有更清潔的方式注入提供者。 正如我現在所做的那樣，我必須擁有http = null，然后在$ get中設置http = $ http，以便我能夠在我的函數中使用它。 以下是我的提供商代碼

CoffeeScript的：

do ->
  githubProvider =() ->
    http = null
    getUser =(username) ->
      return  http.get("https://api.github.com/users/" + username)
                  .then (response)->
                    return response.data

    getRepos =(user) ->
      return http.get(user.repos_url)
                  .then (response)->
                    return response.data

    getRepoDetails =(username, repoName) ->
      return http.get("https://api.github.com/repos/" + username + "/" + repoName)
                  .then (response)->
                    return response.data

    getRepoCollaborators =(repo) ->
      return http.get(repo.contributors_url)
            .then (response)->
              return response.data

    this.$get =["$http", ($http) ->
      http = $http
      return {
      getUser: getUser, 
      getRepos: getRepos, 
      getRepoDetails: getRepoDetails,
      getRepoCollaborators: getRepoCollaborators
      }]
    return 
  app = angular.module("githubViewer")
  app.provider("githubProvider", [githubProvider])
  return

JavaScript的：

  (function() {
    var app, githubProvider;
    githubProvider = function() {
      var getRepoCollaborators, getRepoDetails, getRepos, getUser, http;
      http = null;
      getUser = function(username) {
        return http.get("https://api.github.com/users/" + username).then(function(response) {
          return response.data;
        });
      };
      getRepos = function(user) {
        return http.get(user.repos_url).then(function(response) {
          return response.data;
        });
      };
      getRepoDetails = function(username, repoName) {
        return http.get("https://api.github.com/repos/" + username + "/" + repoName).then(function(response) {
          return response.data;
        });
      };
      getRepoCollaborators = function(repo) {
        return http.get(repo.contributors_url).then(function(response) {
          return response.data;
        });
      };
      this.$get = [
        "$http", function($http) {
          http = $http;
          return {
            getUser: getUser,
            getRepos: getRepos,
            getRepoDetails: getRepoDetails,
            getRepoCollaborators: getRepoCollaborators
          };
        }
      ];
    };
    app = angular.module("githubViewer");
    app.provider("githubProvider", [githubProvider]);
  })();

Answer 1

正如AngularJS Developer's Guide所提到的：

僅當您要為應用程序范圍的配置公開API時才應使用Provider配方，該API必須在應用程序啟動之前進行

從我在代碼中看到的情況來看，大多數功能只能在配置階段之后使用。 您有兩種選擇可供考慮。

[ 1 ]如果您在配置階段沒有需要設置的任何配置，那么考慮如何創建服務而不是提供者。

.service('github', ['$http', function($http) {
      this.getUser = function(username) {
        return $http.get("https://api.github.com/users/" + username).then(function(response) {
          return response.data;
        });
      };
      this.getRepos = function(user) {
        return $http.get(user.repos_url).then(function(response) {
          return response.data;
        });
      };
      this.getRepoDetails = function(username, repoName) {
        return $http.get("https://api.github.com/repos/" + username + "/" + repoName).then(function(response) {
          return response.data;
        });
      };
      this.getRepoCollaborators = function(repo) {
        return $http.get(repo.contributors_url).then(function(response) {
          return response.data;
        });
      };
}]);

[ 2 ]如果你有任何配置，那么只需復制上面的服務，並在提供者的$get定義它。

.provider('github', function() {
      var configuration = {};

      this.setConfiguration = function(configurationParams) {
         configuration = configurationParams;
      };

      this.$get = ['$http', function($http) {
        // you can choose to use your configuration here..

        this.getUser = function(username) {
          return $http.get("https://api.github.com/users/" + username).then(function(response) {
            return response.data;
          });
        };
        this.getRepos = function(user) {
          return $http.get(user.repos_url).then(function(response) {
            return response.data;
          });
        };
        this.getRepoDetails = function(username, repoName) {
          return $http.get("https://api.github.com/repos/" + username + "/" + repoName).then(function(response) {
            return response.data;
          });
        };
        this.getRepoCollaborators = function(repo) {
          return $http.get(repo.contributors_url).then(function(response) {
            return response.data;
          });
        };
      }];
});

然后可以在配置階段使用此提供程序，如下所示：

.config(function(githubProvider) {
  githubProvider.setConfiguration({
    dummyData: 'Dummy Data'
  });
});

在運行階段或控制器中：

.run(function(github) {
  github.getUser('ryebalar').then(function(data) {
    console.log(data);
  });
});

以下是幫助您提供者， 開發人員指南的指南 ，請注意我上面提供的報價來自該指南。