无法从$ injector.get()获取服务实例 [英] can't get service instance from $injector.get()

问题描述

我定义了一个名为"greeting"的客户服务，但是无法从$ injector.get('greeting')获取实例.它将引发以下错误:未知提供者:greetingProvider<-Greeting .那么，哪种方法才是正确的呢?以下是代码:

I define a customer service named "greeting", but can't get the instance from $injector.get('greeting'). It will throw such error: Unknown provider: greetingProvider <- greeting. So which is the right way to get it? Following is the code:

var app = angular.module('myDI', []);
app.config(function($provide){
    $provide.provider('greeting', function(){
        this.$get = function(){
             return function(name) {
                 console.log("Hello, " + name);
            };
        };
    });
});

var injector = angular.injector();
var greeting = injector.get('greeting');
greeting('Ford Prefect');

推荐答案

您需要从模块创建注射器.

You need to create the injector from the module.

var app = angular.module('myDI', []);
app.config(function($provide){
    $provide.provider('greeting', function(){
        this.$get = function(){
             return function(name) {
                 console.log("Hello, " + name);
            };
        };
    });
});
var injector = angular.injector(['myDI', 'ng']); //Add this line
var greeting = injector.get('greeting');
greeting('Ford Prefect');
var injector = angular.injector();

在这里尝试. FIDDLE

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