我得到了BaseComponent注入了一些依赖项的 。第一个依赖EntityService是正确且必要的。
但AnyOtherService仅用于抽象内部BaseComponent。相反,将其注入里面的ChildComponent,它不使用,我想只有内部注入它BaseComonent。
为什么我必须将它ChildComponent推向BaseComponent?最好的解决方案是将其封装在BaseComponent.
基础.component.ts
export abstract class BaseComponent {
constructor(
protected entityService: EntityService,
// protected anyOtherService: AnyOtherService // @todo add this
) {
}
}
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子组件.ts
@Component()
export class ChildComponent extends BaseComponent {
constructor(
private firstService: FirstService,
private secondService: SecondService,
protected anyOtherService: AnyOtherService // @todo remove this
) {
super(
firstService,
anyOtherService // @todo remove this
);
}
}
Run Code Online (Sandbox Code Playgroud) 我试图在要创建的动态组件中注入服务,但是当我尝试注入服务时出现错误。我可以在使用AOT的所有其他组件中注入服务,但在使用JIT时不能。这是代码。
import { Injectable } from '@angular/core';
@Injectable
export class ApplicantSvc
{
name:string;
}
private createComponentFromRaw(template: string){
const tmpCmp = Component({ template })(class {
constructor(private app :ApplicantSvc){}
});
// Now, also create a dynamic module.
const tmpModule = NgModule({
declarations: [tmpCmp],
imports: [CommonModule],
providers: [ApplicantSvc],
})(class {});
this.compiler.compileModuleAndAllComponentsAsync(tmpModule)
.then((factories) => {
const f = factories.componentFactories[0];
this.cmpRef = f.create(this.injector, [], null, this.moduleRef);
this.cmpRef.instance.name = 'my-dynamic-component';
this.vc.insert(this.cmpRef.hostView);
});
}
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在上面的代码中,我为动态模块中的提供程序添加了ApplicantSvc,然后将其注入动态组件构造函数中,但是每当尝试这样做时,都会出现错误
错误错误:无法解析class_1的所有参数:(?)。..... ..... at JitCompiler.push ../ node_modules/@angular/compiler/fesm5/compiler.js.JitCompiler._loadModules(compiler.js:22570)
有一个数字数组,setOfNumbers = [0, 3, 3, 2, 7, 1, -2, 9]我想对这个数组进行排序,使得最后和开始时的数字最小,并且排序集合中心的最大数字就像这样sortedSetNumbers = [0, 2, 3, 9, 7, 3, 1, -2].
const setOfNumbers = [0, 3, 3, 2, 7, 1, -2, 9];
const result = [0, 2, 3, 9, 7, 3, 1, -2];
function sortNormal(a, b) {
return true; // Please, change this line
}
const sortedSetNumbers = setOfNumbers.sort((a, b) => sortNormal(a, b));
if (sortedSetNumbers === result) {
console.info('Succeeded Normal Distributed');
} else {
console.warn('Failed Normal Distribution');
} …Run Code Online (Sandbox Code Playgroud)我正在尝试将 Bourbon 包加载到我的 SCSS 文件中。我正在使用 Angular 2,这是我的 webpack 3.0 配置:
var path = require("path");
var webpack = require("webpack");
module.exports = {
devServer: {
contentBase: path.join(__dirname, "build"),
compress: true,
port: 9000
},
node: {
fs: 'empty'
},
cache: true,
devtool: "eval", //or cheap-module-eval-source-map
entry: {
app: path.join(__dirname, "client/app", "app.js")
},
output: {
path: path.join(__dirname, "buildf"),
filename: "ha.js",
chunkFilename: "[name].js"
},
plugins: [
//Typically you'd have plenty of other plugins here as well
new webpack.DllReferencePlugin({
context: path.join(__dirname, "client"),
manifest: require("./build/vendor-manifest.json")
}),
], …Run Code Online (Sandbox Code Playgroud) angular ×3
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