(SystemJS) Can't resolve all parameters for

angular4中添加service的DI注入后，编译后在tomcat下运行，一直提示

(SystemJS) Can't resolve all parameters for TestComponent: (?).
	syntaxError@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:1513:34 []
	CompileMetadataResolver.prototype._getDependenciesMetadata@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:14790:35 []
	CompileMetadataResolver.prototype._getTypeMetadata@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:14658:21 []
	CompileMetadataResolver.prototype.getNonNormalizedDirectiveMetadata@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:14267:19 []
	CompileMetadataResolver.prototype._getEntryComponentMetadata@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:14911:40 []
	CompileMetadataResolver.prototype.getNgModuleMetadata/<@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:14494:102 []
	CompileMetadataResolver.prototype.getNgModuleMetadata@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:14494:53 []
	JitCompiler.prototype._loadModules@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:25571:41 []
	JitCompiler.prototype._compileModuleAndComponents@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:25530:47 []
	JitCompiler.prototype.compileModuleAsync@http://localhost:8080/web/node_modules/@angular/compiler/bundles/compiler.umd.js:25492:16 []
	PlatformRef_.prototype._bootstrapModuleWithZone@http://localhost:8080/web/node_modules/@angular/core/bundles/core.umd.js:4793:16 []
	PlatformRef_.prototype.bootstrapModule@http://localhost:8080/web/node_modules/@angular/core/bundles/core.umd.js:4779:16 []
	@http://localhost:8080/web/main.js:4:1 []
	@http://localhost:8080/web/main.js:1:31 []
	@http://localhost:8080/web/main.js:1:2 []
	scheduleResolveOrReject/<@http://localhost:8080/web/node_modules/zone.js/dist/zone.js:758:52 []
	drainMicroTaskQueue@http://localhost:8080/web/node_modules/zone.js/dist/zone.js:591:25 []
	ZoneTask/this.invoke@http://localhost:8080/web/node_modules/zone.js/dist/zone.js:464:25 []
	
	Evaluating http://localhost:8080/web/main.js
	Error loading http://localhost:8080/web/main.js  index

但在源码环境下运行正常，于是奇怪了。后来想到编译打包使用的grunt-ts，而编译是angular4提供的样例工程自动编译的，这2者会不会有差异。用对比工具对比后发现，还真有差异。

//danielinbiti

首先少了

var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};

又少了

__metadata("design:paramtypes", [TestService_1.TestService])

于是就出现了参数无法识别的错误。

看来编译方式还得再调整

在grunt-ts可以增加编译项：

emitDecoratorMetadata:true  danielinbiti