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Detailed explanation of the steps to create an Angular project with Angular CLI
Detailed explanation of the steps to create an Angular project with Angular CLI
This time I will bring you a detailed explanation of the steps to create an Angular project with Angular CLI. What are the precautions for creating an Angular project with Angular CLI? The following is a practical case, let's take a look.
Before starting the project, you need to install node and npm first, and then execute npm install -g @angular/cli to install Angular CLI.
1: Use the command line to create a new project
ng new newApp --skip-install cd newApp cnpm install ng serve --open
Executing the above command will automatically create a new Angualr project and start the project.
Among them, --skip-install means that the node package will not be installed first. It will be much faster if we then use cnpm install to install it.
2: Directory structure
Now let’s take a look at what the ng command helps us generate, which is the directory structure of the project, which is First, have a general understanding of what it does. You don’t have to know everything, but first remember the following ones that I feel are important:
1.src: where the application code is stored;
2 .src/app: The main place where your code is stored. This may not be appropriate, but when you develop, you spend most of your time modifying the code here;
3.src/assets: pictures, etc. Where it is stored, it will be copied to the release package when building;
4.src/main.js: You will basically not modify it, it is the main entry of the program;
5.src /styles.css: Specially used styles are written in the corresponding places. As will be mentioned later, public styles will be written here;
6.karma.conf.js: Unit test configuration for Karma. It is used when running ng test.
Three: Self-defining components
import { Component } from '@angular/core';
@Component({
selector: 'my-comp',
template: '<ul><li *ngFor='let row of dataList'>ID:{{row.id}} INFO:{{row.info}}</li></ul>',
styles: [`ul{background-color: antiquewhite;padding-left: 10px;list-style: none;}`]
})
export class MyComponent {
dataList = [
{ id: 1, info: "Angular" },
{ id: 2, info: "React" },
{ id: 3, info: "Vue" }
];
}import { NgModule } from '@angular/core';
import { MyComponent } from './my.component';
@NgModule({
declarations: [
MyComponent
]
})
......Label selector；
2.selector: '.class'//Style selector; 3.selector: '[attribute]'//Attribute selector;
4.selector: '[attribute=value]'//Attribute value selector; 5.selector: ':not(sub_selector)'//Invert selector;6.selector: 'selector1, selector2'//Multiple selectors.Four: Custom service
Like components, let’s define a service first.import { Injectable } from '@angular/core';
export class DataFormat {
id: number;
info: string;
}
@Injectable()
export class MyServ {
getData(): DataFormat[] {
return [
{ id: 1, info: "Angular" },
{ id: 2, info: "React" },
{ id: 3, info: "Vue" }
];
}
}The use of the
import { Component } from '@angular/core';
import { MyServ } from './my.service';
@Component({
providers: [MyServ]
})constructor to demonstrate it here:
import { MyServ } from './my.service';
......
export class MyComponent {
dataList: any[];
constructor(private demoService: MyServ) {
this.dataList = this.demoService.getData();
}
}5: The use of routing
We give a simple usage of routing here. The specific details are similar to the above and will be discussed separately. To discuss, the purpose of this article is to get started quickly. For the convenience of demonstration, we have defined two components by default: MyComponent and My2Component. First of all, you need to make sure that......
import { RouterModule } from '@angular/router';
@NgModule({
declarations: [MyComponent,My2Component],
imports: [
RouterModule.forRoot([
{path: 'my',component: MyComponent},
{path: 'my2',component: My2Component}
])
]
......
})
......<a routerLink="/my">toMycomp</a> <a routerLink="/my2">toMy2comp</a> <router-outlet></router-outlet>
点击toMycomp或者toMy2comp就会跳转对应的路由设置的组件了。
六：HTTP
由于@angular/http库中的HttpModule保存着http相关的服务，需要先引入进来（这里是在src/app/app.module.ts中引入）：
import { HttpModule } from '@angular/http';
@NgModule({
imports: [HttpModule]
})
......现在，http就是一个服务，下面简单演示一种用法：
......
import { Http } from '@angular/http';
......
constructor(private http: Http) {
http.get('assets/XXX.json').forEach(function (data) {
console.log(data['_body']);
});
}
......相信看了本文案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！
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