js实现依赖注入

function a(){
   console.log("a");
}

function b () {
   console.log("b");
}

function c () {
   console.log("c");
}

var injector = {
   dependencies: {},
   register: function(key, value) {
      this.dependencies[key] = value;
   },
   resolve: function(deps, func, scope) {
      var func, deps, scope, args = [], self = this;

      func = arguments[0];
      deps = func.toString().match(/^function\s*[^\(]*\(\s*([^\)]*)\)/m)[1].replace(/\s/g, '').split(',');
      scope = arguments[1] || {};

      return function() {
         var a = Array.prototype.slice.call(arguments, 0);

         for(var i=0; i<deps.length; i++) {
            var d = deps[i];
            args.push(self.dependencies[d] && d != '' ? self.dependencies[d] : a.shift());
         }

         func.apply(scope || {}, args);
      }
   }
}

injector.register("a", a);
injector.register("b", b);

injector.resolve(function (b, a, c) {
   a();
   b();
   c();
})(c);