第一种，模块注入需要两次，两次的顺序要固定，模块名能在调用时改名
var injector = {
dependencies: {},
register: function(key, value) {
this.dependencies[key] = value;
},
resolve: function(deps, func, scope) {
var args = [];
for(var i=0; i<deps.length, d=deps[i]; i++) {
if(this.dependencies[d]) {
args.push(this.dependencies[d]);
} else {
throw new Error('Can\'t resolve ' + d);
}
}
return function() {
func.apply(scope || {}, args.concat(Array.prototype.slice.call(arguments, 0)));
}
}
}
第二种，模块注入只需一次，不需要固定顺序，但是模块名不能修改
var injector = {
dependencies: {},
register: function(key, value) {
this.dependencies[key] = value;
},
resolve: function() {
var func, deps, scope, args = [], self = this;
if(typeof arguments[0] === 'string') {
func = arguments[1];
deps = arguments[0].replace(/ /g, '').split(',');
scope = arguments[2] || {};
} else {
func = arguments[0];
deps = func.toString().match(/^function\s*[^\(]*\(\s*([^\)]*)\)/m)[1].replace(/ /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);
}
}
}