依赖注入的实现像角

Question

我最近有一个采访和面试官只是问我一个问题，他说我把你的时间问题是“你可以实现像角度良好的程序的依赖注入？”我尝试尽我所能，但它似乎面试不喜欢我的程序，所以任何人都可以给我一个简单的建议，我怎么能实现它像角？ 谢谢

Answer 1

var WelcomeController = function (Greeter) { 
    document.write(Greeter.greet()); 
}; 

var Injector = { 

    dependencies: {}, 

    process: function(target) { 
     var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m; 
     var FN_ARG_SPLIT = /,/; 
     var FN_ARG = /^\s*(_?)(\S+?)\1\s*$/; 
     var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg; 
     var text = target.toString(); 
     var args = text.match(FN_ARGS)[1].split(','); 

     target.apply(target, this.getDependencies(args)); 
    }, 

    getDependencies: function(arr) { 
     var self = this; 
     return arr.map(function(value) { 

      return self.dependencies[value]; 
     });    
    }, 

    register: function(name, dependency) { 
     this.dependencies[name] = dependency; 
    } 

}; 

var RobotGreeter = { 
    greet: function() { 
    return 'Domo Arigato'; 
    } 
}; 

var OtherGreeter = { 
    greet: function() { 
     return 'That will do pig.'; 
    } 
}; 

// Randomly register a different greeter to show that WelcomeController is truly dynamic. 
Injector.register('Greeter', Math.random() > 0.5 ? RobotGreeter : OtherGreeter); 

Injector.process(WelcomeController);