npm install @ngx-translate/core --save

-- 如果需要指定翻译文件,则还需下载
npm install @ngx-translate/http-loader --save

import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    ...
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory:  (http: HttpClient) => new TranslateHttpLoader(http, './assets/i18n/', '.json'), //指定加载的配置文件
        deps: [HttpClient]
      },
      defaultLanguage: 'tw' //指定默认语系
    })
  ],
  providers: [
    { provide: MAT_DIALOG_DATA, useValue: {} }
  ],
  bootstrap: [AppComponent]
})

常见的异步编程的几种方法:
    1. 回调函数
    2. 事件监听/发布订阅
    3. Promise(来自ES6)
    4. RxJs
    
1.Promise使用demo:
    - Promise中resolve代表成功回调,reject代表失败回调
    funtion getPromiseData(){
        return new Promise((resolve,reject)=>{
            //通过resolve(data),传递结果
            setTimeout(()=>{
                var name = '张三';
                resolve(name);
            },1000);   
        });
    }
    
    - 外部获取Promise数据
    var promiseData = getPromiseData().then((data)->{
        console.log(data);
    })
    
2.使用rxJs获取异步数据
    - 首先需要引入Observable
    import {Observable} from 'rxjs';
    
    - 通过observer.next(data),传递结果,observer.error(data)来处理异常
    function getRxJsData(){
        return new Observable((observer)->{
            setTimeout(()=>{
                var name = '张三';
                observer.next(name);
            },1000);
        });
    }         
    
    - 外部获取RxJs数据
    var rxJsData = getRxJsData().subscribe((data)->{
        console.log(data);
    });

RxJs比Promise功能更加强大
1. RxJs可以通过unsubscribe(),来中止异步操作,而Promise不行
2. RxJs执行的异步方法可以多次执行(如果异步方法是个定时循环的),而Promise不行
3. RxJs还提供了很多便利的工具类(map,filter,类似java8)
    import {map,filter} from 'rxjs/operators';
    
    var stream = this.getRxJsData().pipe(
        filter((value)=>{
            if(value%2 ==0){
                return true;
            }  
        }),
        map((value)=>{
            return value * value;
        })
    ).subscribe((data)=>{
        console.log(data);
    });
    

{
  "query": {
    "function_score": {
      "query": {
        "bool": {
          "must": [
            {
              "term": {
                "typeCode": "01"
              }
            },
            {
              "term": {
                "gradeCode": "3101"
              }
            }
          ],
          "must_not": [],
          "should": []
        }
      },
      "functions": [
        {
          "random_score": {
            "seed": "15:38:48"
          }
        }
      ],
      "score_mode": "sum"
    }
  },
  "size": 1,
  "from": 0
}

wget https://alibaba.github.io/arthas/arthas-demo.jar
java -jar arthas-demo.jar

curl -O https://alibaba.github.io/arthas/arthas-boot.jar
java -jar arthas-boot.jar