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<h2 id="开始准备"><a href="#开始准备" class="headerlink" title="开始准备"></a>开始准备</h2><ol>
<li><p>安装nodejs</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">npm -v</span><br></pre></td></tr></table></figure>
</li>
<li><p>安装@angular/cli</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">npm i -g @angular/cli</span><br></pre></td></tr></table></figure>
</li>
<li><p>CLI命令建立项目</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ng new ng7demo</span><br></pre></td></tr></table></figure>
<p>选择是否加入路由模块以及哪种css预处理器</p>
</li>
</ol>
<blockquote>
<p>可ctrl+c取消自动安装node_modules，手动进入项目npm install
node-sass安装不上可切换淘宝镜像库或者用cnpm安装</p>
<ol>
<li>npm config set registry <a href="https://registry.npm.taobao.org" target="_blank" rel="noopener">https://registry.npm.taobao.org</a>
npm install</li>
</ol>
</blockquote>
<p>or </p>
<ol start="2">
<li><p>npm install -g cnpm
cnpm install </p>
</li>
<li><p>启动项目</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ng serve --open <span class="comment">// 自动打开浏览器 http://localhost:4200/</span></span><br></pre></td></tr></table></figure>
</li>
</ol>
<hr>
<a id="more"></a>
<h2 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h2><h3 id="生成组件"><a href="#生成组件" class="headerlink" title="生成组件"></a>生成组件</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">// 标签app-article 如果不想要或者自定义前缀可在angular.json里修改prefix属性</span><br><span class="line">ng g c article</span><br><span class="line">// 可添加目录</span><br><span class="line">ng g s ./serveices/eventBus</span><br><span class="line">//</span><br></pre></td></tr></table></figure>
<h3 id="组件引用"><a href="#组件引用" class="headerlink" title="组件引用"></a>组件引用</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">// 标签方式引用</span><br><span class="line"><app-article></app-article></span><br><span class="line">// 属性方式引用</span><br><span class="line"><div app-article></div></span><br><span class="line">// 类方式引用</span><br><span class="line"><div class="app-article"></div></span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">// @Component装饰器标识这是一个组件</span><br><span class="line">@Component({</span><br><span class="line"> //selector: 'app-article',</span><br><span class="line"> //selector: '[app-article]', //属性方式</span><br><span class="line"> selector: '.app-article',//类方式</span><br><span class="line"> templateUrl: './article.component.html',</span><br><span class="line"> styleUrls: ['./article.component.css']</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<h3 id="插值表达式"><a href="#插值表达式" class="headerlink" title="插值表达式"></a>插值表达式</h3><p>将业务逻辑中的数据通过插值表达式显示在模板文件，即html页面上，或者将html页面上的事件传输到业务逻辑。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><p>标题是{{title}}</p></span><br></pre></td></tr></table></figure>
<h3 id="属性绑定"><a href="#属性绑定" class="headerlink" title="属性绑定"></a>属性绑定</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><img [src]="imgSrc" /></span><br><span class="line"><input value="value"</span><br></pre></td></tr></table></figure>
<h3 id="插值运算-加减乘除-字符串拼接-三元-方法调用"><a href="#插值运算-加减乘除-字符串拼接-三元-方法调用" class="headerlink" title="插值运算 加减乘除/字符串拼接/三元/方法调用"></a>插值运算 加减乘除/字符串拼接/三元/方法调用</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">{{5+3}},{{5-3}},{{5*3}},{{5/3}},{{ "a" + "b"}},{{true?1:0}}</span><br></pre></td></tr></table></figure>
<h3 id="事件绑定"><a href="#事件绑定" class="headerlink" title="事件绑定"></a>事件绑定</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><button (click)="showModal('click')"><button></span><br><span class="line">// 传递事件参数</span><br><span class="line"><input type="text" (keyup) = "updateContent($event)"/></span><br><span class="line">// 双向绑定 视图和数据，只要一方发生变化，另一方跟着变化。</span><br><span class="line">// 不需要在代码中手动更新视图，简化开发，增加代码内聚性，代码可读性更强。</span><br><span class="line"><input type="text" [(ngModel)]="title"/></span><br><span class="line">// 为了ngModel能够解析需要引入import {FormsModule} from "@angular/forms";</span><br></pre></td></tr></table></figure>
<h3 id="模板指令"><a href="#模板指令" class="headerlink" title="模板指令"></a>模板指令</h3><h4 id="判断指令"><a href="#判断指令" class="headerlink" title="判断指令"></a>判断指令</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><img *ngIf="imgShow;else #p1"/></span><br><span class="line"><p #p1></p></span><br></pre></td></tr></table></figure>
<h4 id="样式指令"><a href="#样式指令" class="headerlink" title="样式指令"></a>样式指令</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><p [ngClass]="{bg:true}">这段内容应用的是类样式。</p></span><br><span class="line"><p [ngStyle]="{backgroundColor:pink}">本段内容样式是内联样式。</p></span><br></pre></td></tr></table></figure>
<h4 id="循环指令"><a href="#循环指令" class="headerlink" title="循环指令"></a>循环指令</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><ul></span><br><span class="line"> <li *ngFor="let race of raceList; let i = index"></span><br><span class="line"> {{ race.name }}-{{ i + 1 }}</span><br><span class="line"> </li></span><br><span class="line"></ul></span><br></pre></td></tr></table></figure>
<h3 id="管道符"><a href="#管道符" class="headerlink" title="管道符"></a>管道符</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">{{currentTime | date: "yyyy-MM-dd HH:mm:ss" }}</span><br></pre></td></tr></table></figure>
<h3 id="父子组件通信"><a href="#父子组件通信" class="headerlink" title="父子组件通信"></a>父子组件通信</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">// 输入</span><br><span class="line"><child title="我的子组件"></child></span><br><span class="line">@Input</span><br><span class="line">public title:string =""</span><br><span class="line">// 输出</span><br><span class="line"><child title="我的子组件" #child (follow)="getFollow($event)"></child></span><br><span class="line">@Output()</span><br><span class="line">public follow = new EventEmitter();</span><br><span class="line">this.follow.emit("子组件传来的数据");</span><br></pre></td></tr></table></figure>
<h3 id="localsStorage"><a href="#localsStorage" class="headerlink" title="localsStorage"></a>localsStorage</h3><h3 id="服务总线"><a href="#服务总线" class="headerlink" title="服务总线"></a>服务总线</h3><ol>
<li><p>注册服务</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">ng g s ./services/eventBus</span><br><span class="line">import { Injectable } from "@angular/core";</span><br><span class="line">import { Observable, Subject } from "rxjs";</span><br><span class="line">// 服务总线 组件间分享数据</span><br><span class="line">@Injectable({</span><br><span class="line"> providedIn: "root"</span><br><span class="line">})</span><br><span class="line">export class EventBusService {</span><br><span class="line"> public eventBus: Subject<string> = new Subject();</span><br><span class="line"> constructor() {}</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
<li><p>组件内发射数据</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">this</span>.eventBusService.eventBus.next(<span class="string">"child组件发送的数据"</span>);</span><br></pre></td></tr></table></figure>
</li>
<li><p>组件接收数据</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">this</span>.eventBusService.eventBus.subscribe(<span class="function"><span class="params">arg</span> =></span> {</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="string">`接收到事件<span class="subst">${arg}</span>`</span>);</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h3 id="标签变量引用"><a href="#标签变量引用" class="headerlink" title="标签变量引用"></a>标签变量引用</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><child title="我的子组件" #child (follow)="getFollow($event)"></child></span><br><span class="line"><button (click)="child.sayHello()">子组件说话</button></span><br></pre></td></tr></table></figure>
<h3 id="组件注册"><a href="#组件注册" class="headerlink" title="组件注册"></a>组件注册</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">import { BrowserModule } from '@angular/platform-browser';</span><br><span class="line">import { NgModule } from '@angular/core';</span><br><span class="line"></span><br><span class="line">import { AppRoutingModule } from './app-routing.module';</span><br><span class="line">import { AppComponent } from './app.component';</span><br><span class="line"></span><br><span class="line">@NgModule({</span><br><span class="line"> declarations: [</span><br><span class="line"> AppComponent</span><br><span class="line"> ],</span><br><span class="line"> imports: [</span><br><span class="line"> BrowserModule,</span><br><span class="line"> AppRoutingModule</span><br><span class="line"> ],</span><br><span class="line"> providers: [],</span><br><span class="line"> bootstrap: [AppComponent]</span><br><span class="line">})</span><br><span class="line">export class AppModule { }</span><br><span class="line">// import部分是模块以及装饰器的引入。</span><br><span class="line">// declarations部分是声明模块的内部成员。</span><br><span class="line">// imports部分是导入其它模块。</span><br><span class="line">// providers指定应用程序根级别需要使用的service。</span><br><span class="line">// bootstrap是app启动的根组件。</span><br><span class="line">// export控制将那些内部成员暴露给外部使用。</span><br></pre></td></tr></table></figure>
<h3 id="路由导航"><a href="#路由导航" class="headerlink" title="路由导航"></a>路由导航</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">import { NgModule } from '@angular/core';</span><br><span class="line">import { Routes, RouterModule } from '@angular/router';</span><br><span class="line">import { ChildComponent } from "./child/child.component";</span><br><span class="line">import { BrotherComponent } from "./brother/brother.component";</span><br><span class="line"></span><br><span class="line">const routes: Routes = [{</span><br><span class="line"> path: '',</span><br><span class="line"> component: ChildComponent</span><br><span class="line">},</span><br><span class="line">{</span><br><span class="line"> path: 'brother',</span><br><span class="line"> component: BrotherComponent</span><br><span class="line">}];</span><br><span class="line"></span><br><span class="line">@NgModule({</span><br><span class="line"> imports: [RouterModule.forRoot(routes)],</span><br><span class="line"> exports: [RouterModule]</span><br><span class="line">})</span><br><span class="line">export class AppRoutingModule { }</span><br><span class="line">```</span><br></pre></td></tr></table></figure>
<!--RouterOutlet 相当于一个占位符,在Angular中根据路由状态动态插入视图。-->
<p><a [routerlink]="['/']">child</a><br>
<a [routerlink]="['/brother']">brother</a></p>
<p><router-outlet></router-outlet>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">### http服务</span><br></pre></td></tr></table></figure>
// app.module.ts
import { HttpModule } from ‘@angular/http’;
import { HttpClientModule } from ‘@angular/common/http’;
// services
import { Headers } from ‘@angular/http’;
import { HttpClient, HttpResponse } from ‘@angular/common/http’;</p>
<p>this.httpClient.request(UserService.METHOD_POST, url, options).subscribe((data)=>{});
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">## ng7的新特性</span><br></pre></td></tr></table></figure>
// angular.json
“budgets”: [
{
“type”: “initial”,
“maximumWarning”: “2mb”,
“maximumError”: “5mb”
}
]
// 这个配置适用于打包文件限制 ng build –prod
// 打包生成生产环境时如果包大于2MB,那么CLI工具会提示waning,如果大于5MB,中断打包。
<code>`</code></p>
<h2 id="npm-i-和-npm-install的小区别"><a href="#npm-i-和-npm-install的小区别" class="headerlink" title="npm i 和 npm install的小区别"></a>npm i 和 npm install的小区别</h2><p>1、用npm i 安装的模块无法用npm uninstall卸载，需要用npm uninstall i命令</p>
<p>2、npm i 会帮助检测与当前node版本最匹配的npm包 版本号，并匹配出来相互依赖的npm包应该提升的版本号</p>
<p>3、部分npm包在当前node版本下无法使用，必须使用建议版本</p>
<p>4、安装报错时intall肯定会出现npm-debug.log 文件，npm i不一定</p>
<h2 id="npm-install-的执行过程"><a href="#npm-install-的执行过程" class="headerlink" title="npm install 的执行过程"></a>npm install 的执行过程</h2><ol>
<li>发出npm install命令</li>
<li>查询 node_modules 目录之中是否已经存在指定模块</li>
<li>若存在，不再重新安装</li>
<li>若不存在npm 向 registry 查询模块压缩包的网址下载压缩包，存放在根目录下的.npm目录里</li>
<li>解压压缩包到当前项目的 node_modules 目录</li>
</ol>
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<p><span>发布时间:</span>2018年12月19日 - 01:12</p>
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<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#开始准备"><span class="nav-number">1.</span> <span class="nav-text">开始准备</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#语法"><span class="nav-number">2.</span> <span class="nav-text">语法</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#生成组件"><span class="nav-number">2.1.</span> <span class="nav-text">生成组件</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#组件引用"><span class="nav-number">2.2.</span> <span class="nav-text">组件引用</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#插值表达式"><span class="nav-number">2.3.</span> <span class="nav-text">插值表达式</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#属性绑定"><span class="nav-number">2.4.</span> <span class="nav-text">属性绑定</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#插值运算-加减乘除-字符串拼接-三元-方法调用"><span class="nav-number">2.5.</span> <span class="nav-text">插值运算 加减乘除/字符串拼接/三元/方法调用</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#事件绑定"><span class="nav-number">2.6.</span> <span class="nav-text">事件绑定</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#模板指令"><span class="nav-number">2.7.</span> <span class="nav-text">模板指令</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#判断指令"><span class="nav-number">2.7.1.</span> <span class="nav-text">判断指令</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#样式指令"><span class="nav-number">2.7.2.</span> <span class="nav-text">样式指令</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#循环指令"><span class="nav-number">2.7.3.</span> <span class="nav-text">循环指令</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#管道符"><span class="nav-number">2.8.</span> <span class="nav-text">管道符</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#父子组件通信"><span class="nav-number">2.9.</span> <span class="nav-text">父子组件通信</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#localsStorage"><span class="nav-number">2.10.</span> <span class="nav-text">localsStorage</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#服务总线"><span class="nav-number">2.11.</span> <span class="nav-text">服务总线</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#标签变量引用"><span class="nav-number">2.12.</span> <span class="nav-text">标签变量引用</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#组件注册"><span class="nav-number">2.13.</span> <span class="nav-text">组件注册</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#路由导航"><span class="nav-number">2.14.</span> <span class="nav-text">路由导航</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#npm-i-和-npm-install的小区别"><span class="nav-number">3.</span> <span class="nav-text">npm i 和 npm install的小区别</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#npm-install-的执行过程"><span class="nav-number">4.</span> <span class="nav-text">npm install 的执行过程</span></a></li></ol></div>
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