npm install @ngx-translate/core --save
npm install @ngx-translate/http-loader --save // 针对Angular>=4.3
npm install @ngx-translate/http-loader@0.1.0 --save // 针对Angular<4.3

import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {HttpClientModule, HttpClient} from '@angular/common/http';
import {TranslateModule, TranslateLoader} from '@ngx-translate/core';
import {TranslateHttpLoader} from '@ngx-translate/http-loader';
import {AppComponent} from './app';
export function createTranslateLoader(http: HttpClient) {
  return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}
 
@NgModule({
  imports: [
    BrowserModule,
    HttpClientModule,
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: (createTranslateLoader),
        deps: [HttpClient]
      }
    })
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

@NgModule({
  imports: [
    BrowserModule,
    HttpModule,
    TranslateModule.forRoot({
      provide: TranslateLoader,
      useFactory: (http: HttpClient) => new TranslateStaticLoader(http, '/assets/i18n', '.json'),
      deps: [HttpClient]
    })
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

import {TranslateService} from '@ngx-translate/core';

constructor(private translate: TranslateService) {
 // this language will be used as a fallback when a translation isn't found in the current language
 translate.setDefaultLang('en');

 // use the brower's default lang, if the lang isn't available, it will use the 'en'
 let broswerLang = translate.getBrowserLang();
 translate.use(broswerLang.match(/en|cn/) "htmlcode">

{
  "HELLO": "hello {{value}}"
}


另外也可以通过setTranslation方法手动加载。


translate.setTranslation('en', {
  HELLO: 'hello {{value}}'
});


同时，这里的json结构是支持嵌套的。


{
  "HOME": {
    "HELLO": "hello {{value}}"
  }
}


以上结构，可以通过"HOME.HELLO"来引用HELLO的内容。 
4、使用方法
我们可以通过TranslateService, TranslatePipe 或者 TranslateDirective这三种方式来获取我们翻译的文本内容。
TranslateService：


translate.get('HELLO', {value: 'world'}).subscribe((res: string) => {
  console.log(res);
  //=> 'hello world'
});


其中第二个参数{value: 'world'}是可选的。 
TranslateService：


<div>{{ 'HELLO' | translate:param }}</div>


param可以像如下方式在component里面定义。同样，这个参数也是可选的。


param = {value: 'world'};


 TranslateDirective：


<div [translate]="'HELLO'" [translateParams]="{value: 'world'}"></div>


或者


<div translate [translateParams]="{value: 'world'}">HELLO</div>


5、使用HTML标签
允许在你的翻译文本中直接嵌入HTML标签。


{
  "HELLO": "Welcome to my Angular application!<br><strong>This is an amazing app which uses the latest technologies!</strong>"
}


这时可以使用innerHTML 来进行渲染。


<div [innerHTML]="'HELLO' | translate"></div>


TranslateService API
公有属性(public properties):


/**
 * The default lang to fallback when translations are missing on the current lang
 */
defaultLang: string;
/**
 * The lang currently used
 * @type {string}
 */
currentLang: string;
/**
 * an array of langs
 * @type {Array}
 */
langs: string[];
/**
 * a list of translations per lang
 * @type {{}}
 */
translations: any;




公有方法(public methods):


/**
 * Sets the default language to use as a fallback
 * @param lang
 */
setDefaultLang(lang: string): void;
/**
 * Gets the default language used
 * @returns string
 */
getDefaultLang(): string;
/**
 * Changes the lang currently used
 * @param lang
 * @returns {Observable<*>}
 */
use(lang: string): Observable<any>;
/**
 * Gets an object of translations for a given language with the current loader
 * and passes it through the compiler
 * @param lang
 * @returns {Observable<*>}
 */
getTranslation(lang: string): Observable<any>;
/**
 * Manually sets an object of translations for a given language
 * after passing it through the compiler
 * @param lang
 * @param translations
 * @param shouldMerge
 */
setTranslation(lang: string, translations: Object, shouldMerge"de"
 *
 * @returns string
 */
getBrowserLang(): string;
/**
 * Returns the culture language code name from the browser, e.g. "de-DE"
 *
 * @returns string
 */
getBrowserCultureLang(): string;




以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。