我试图在我的组件中实现服务，但它给了我一个错误
EXCEPTION: TypeError: Cannot read property 'query' of null
platform-browser.umd.js:962 EXCEPTION: TypeError: Cannot read property 'query' of nullBrowserDomAdapter.logError @ platform-browser.umd.js:962BrowserDomAdapter.logGroup @ platform-browser.umd.js:972ExceptionHandler.call @ core.umd.js:3696(anonymous function) @ core.umd.js:8982ZoneDelegate.invoke @ zone.js:323onInvoke @ core.umd.js:6075ZoneDelegate.invoke @ zone.js:322Zone.run @ zone.js:216(anonymous function) @ zone.js:571ZoneDelegate.invokeTask @ zone.js:356onInvokeTask @ core.umd.js:6066ZoneDelegate.invokeTask @ zone.js:355Zone.runTask @ zone.js:256drainMicroTaskQueue @ zone.js:474ZoneTask.invoke @ zone.js:426
platform-browser.umd.js:971 EXCEPTION: Error: Uncaught (in promise): TypeError: Cannot read property 'query' of null
platform-browser.umd.js:962 EXCEPTION: Error: Uncaught (in promise): TypeError: Cannot read property 'query' of nullBrowserDomAdapter.logError @ platform-browser.umd.js:962BrowserDomAdapter.logGroup @ platform-browser.umd.js:972ExceptionHandler.call @ core.umd.js:3696(anonymous function) @ core.umd.js:8951schedulerFn @ core.umd.js:6007SafeSubscriber.__tryOrUnsub @ Subscriber.ts:240SafeSubscriber.next @ Subscriber.ts:192Subscriber._next @ Subscriber.ts:133Subscriber.next @ Subscriber.ts:93Subject._finalNext @ Subject.ts:154Subject._next @ Subject.ts:144Subject.next @ Subject.ts:90EventEmitter.emit @ core.umd.js:5996onError @ core.umd.js:6227onHandleError @ core.umd.js:6096ZoneDelegate.handleError @ zone.js:327Zone.runGuarded @ zone.js:233_loop_1 @ zone.js:487drainMicroTaskQueue @ zone.js:494ZoneTask.invoke @ zone.js:426
platform-browser.umd.js:962 STACKTRACE:BrowserDomAdapter.logError @ platform-browser.umd.js:962ExceptionHandler.call @ core.umd.js:3698(anonymous function) @ core.umd.js:8951schedulerFn @ core.umd.js:6007SafeSubscriber.__tryOrUnsub @ Subscriber.ts:240SafeSubscriber.next @ Subscriber.ts:192Subscriber._next @ Subscriber.ts:133Subscriber.next @ Subscriber.ts:93Subject._finalNext @ Subject.ts:154Subject._next @ Subject.ts:144Subject.next @ Subject.ts:90EventEmitter.emit @ core.umd.js:5996onError @ core.umd.js:6227onHandleError @ core.umd.js:6096ZoneDelegate.handleError @ zone.js:327Zone.runGuarded @ zone.js:233_loop_1 @ zone.js:487drainMicroTaskQueue @ zone.js:494ZoneTask.invoke @ zone.js:426
platform-browser.umd.js:962 Error: Uncaught (in promise): TypeError: Cannot read property 'query' of null
at resolvePromise (zone.js:538)
at PromiseCompleter.reject (zone.js:515)
at eval (core.umd.js:8981)
at ZoneDelegate.invoke (zone.js:323)
at Object.onInvoke (core.umd.js:6075)
at ZoneDelegate.invoke (zone.js:322)
at Zone.run (zone.js:216)
at zone.js:571
at ZoneDelegate.invokeTask (zone.js:356)
at Object.onInvokeTask (core.umd.js:6066)BrowserDomAdapter.logError @ platform-browser.umd.js:962ExceptionHandler.call @ core.umd.js:3699(anonymous function) @ core.umd.js:8951schedulerFn @ core.umd.js:6007SafeSubscriber.__tryOrUnsub @ Subscriber.ts:240SafeSubscriber.next @ Subscriber.ts:192Subscriber._next @ Subscriber.ts:133Subscriber.next @ Subscriber.ts:93Subject._finalNext @ Subject.ts:154Subject._next @ Subject.ts:144Subject.next @ Subject.ts:90EventEmitter.emit @ core.umd.js:5996onError @ core.umd.js:6227onHandleError @ core.umd.js:6096ZoneDelegate.handleError @ zone.js:327Zone.runGuarded @ zone.js:233_loop_1 @ zone.js:487drainMicroTaskQueue @ zone.js:494ZoneTask.invoke @ zone.js:426
zone.js:461 Unhandled Promise rejection: Cannot read property 'query' of null ; Zone: angular ; Task: Promise.then ; Value: TypeError: Cannot read property 'query' of null(…)consoleError @ zone.js:461_loop_1 @ zone.js:490drainMicroTaskQueue @ zone.js:494ZoneTask.invoke @ zone.js:426
zone.js:463 Error: Uncaught (in promise): TypeError: Cannot read property 'query' of null(…)
我的代码：
的package.json
{
"name": "angular2-quickstart",
"version": "1.0.0",
"scripts": {
"start": "tsc && concurrently \"npm run tsc:w\" \"npm run lite\" ",
"lite": "lite-server",
"postinstall": "typings install",
"tsc": "tsc",
"tsc:w": "tsc -w",
"typings": "typings"
},
"license": "ISC",
"dependencies": {
"@angular/common": "2.0.0-rc.1",
"@angular/compiler": "2.0.0-rc.1",
"@angular/core": "2.0.0-rc.1",
"@angular/http": "2.0.0-rc.1",
"@angular/platform-browser": "2.0.0-rc.1",
"@angular/platform-browser-dynamic": "2.0.0-rc.1",
"@angular/router": "2.0.0-rc.1",
"@angular/router-deprecated": "2.0.0-rc.1",
"@angular/upgrade": "2.0.0-rc.1",
"systemjs": "0.19.27",
"core-js": "^2.4.0",
"reflect-metadata": "^0.1.3",
"rxjs": "5.0.0-beta.6",
"zone.js": "^0.6.12",
"angular2-in-memory-web-api": "0.0.10",
"bootstrap": "^3.3.6"
},
"devDependencies": {
"concurrently": "^2.0.0",
"lite-server": "^2.2.0",
"typescript": "^1.8.10",
"typings":"^1.0.4"
}
}
systemjs.config.js
/**
* System configuration for Angular 2 samples
* Adjust as necessary for your application needs.
*/
(function(global) {
// map tells the System loader where to look for things
var map = {
'app': 'assets/js/angular2/app', // 'dist',
'@angular': 'assets/js/angular2/node_modules/@angular',
'angular2-in-memory-web-api': 'assets/js/angular2/node_modules/angular2-in-memory-web-api',
'rxjs': 'assets/js/angular2/node_modules/rxjs'
};
// packages tells the System loader how to load when no filename and/or no extension
var packages = {
'app': { main: 'main.js', defaultExtension: 'js' },
'rxjs': { defaultExtension: 'js' },
'angular2-in-memory-web-api': { defaultExtension: 'js' },
};
var ngPackageNames = [
'common',
'compiler',
'core',
'http',
'platform-browser',
'platform-browser-dynamic',
'router',
'router-deprecated',
'upgrade',
];
// Add package entries for angular packages
ngPackageNames.forEach(function(pkgName) {
packages['@angular/'+pkgName] = { main: pkgName + '.umd.js', defaultExtension: 'js' };
});
var config = {
map: map,
packages: packages
}
System.config(config);
})(this);
tsconfig.json
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": false
}
}
typings.json
{
"globalDependencies": {
"core-js": "registry:dt/core-js#0.0.0+20160317120654",
"jasmine": "registry:dt/jasmine#2.2.0+20160505161446",
"node": "registry:dt/node#4.0.0+20160509154515"
}
}
文件包含
<script src="assets/js/angular2/node_modules/core-js/client/shim.min.js"></script>
<script src="assets/js/angular2/node_modules/zone.js/dist/zone.js"></script>
<script src="assets/js/angular2/node_modules/reflect-metadata/Reflect.js"></script>
<script src="assets/js/angular2/node_modules/systemjs/dist/system.src.js"></script>
<!-- 2. Configure SystemJS -->
<script src="assets/js/angular2/systemjs.config.js"></script>
<script>
System.import('app').catch(function(err){
console.error(err);
});
</script>
main.ts
import { bootstrap } from '@angular/platform-browser-dynamic';
import { FeedsComponent } from 'assets/js/angular2/app/feeds.component';
bootstrap(FeedsComponent);
feeds.component.ts
import { Component } from '@angular/core';
import { FeedsService } from 'assets/js/angular2/app/feeds.service';
@Component({
selector: 'feeds',
templateUrl: 'assets/partials/wall/Feeds.html',
providers: [FeedsService]
})
export class FeedsComponent {
constructor(private _feedsService: FeedsService) { }
}
feeds.service.ts
import {Injectable} from '@angular/core';
//@Injectable()
export class FeedsService {
getFeeds() {
return [];
}
}
请告诉我我做错了什么以及如何解决这个问题它只是在我删除服务代码后才能正常运行feeds.service.ts文件并且还让我知道如何调用服务带有传递参数的angular2中的http。
提前致谢：）
答案 0 :(得分：0)
如果您注释了@injectable，则无法将服务注入到您的组件中，使用@injectable并且将解析依赖关系