打字稿错误：找不到姓名＆＃cord;＆＃39;

Question

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import {Component} from '@angular/core';
import {NavController, Platform, AlertController} from 'ionic-angular';
import {Transfer, TransferObject} from '@ionic-native/transfer';
import {File} from '@ionic-native/file';



@Component({
  selector: 'page-about',
  templateUrl: 'about.html',
  providers: [Transfer, TransferObject, File]
})
export class AboutPage {

  storageDirectory: string = '';

  constructor(public navCtrl: NavController, public platform: Platform, private transfer: Transfer, private file: File, public alertCtrl: AlertController) {
    this.platform.ready().then(() => {
      // make sure this is on a device, not an emulation (e.g. chrome tools device mode)
      if(!this.platform.is('cordova')) {
        return false;
      }

      if (this.platform.is('ios')) {
        this.storageDirectory = cordova.file.documentsDirectory;
      }
      else if(this.platform.is('android')) {
        this.storageDirectory = cordova.file.externalDataDirectory;
		console.log(this.storageDirectory);
      }
      else {
        // exit otherwise, but you could add further types here e.g. Windows
        return false;
      }
    });
  }
  
   downloadImage() {

    this.platform.ready().then(() => {

      const fileTransfer: TransferObject = this.transfer.create();

      const imageLocation = 'http://html5demos.com/assets/dizzy.mp4';

      fileTransfer.download(imageLocation, this.storageDirectory + 'dizzy.mp4').then((entry) => {
       
	   const alertSuccess = this.alertCtrl.create({
          title: `Download Succeeded!`,
          subTitle: `successfully downloaded to: ${entry.toURL()}`,
          buttons: ['Ok']
        });

        alertSuccess.present();

      }, (error) => {

        const alertFailure = this.alertCtrl.create({
          title: `Download Failed!`,
          subTitle: `was not downloaded. Error code: ${error}`,
          buttons: ['Ok']
        });

        alertFailure.present();

      });

    });

  }


}

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I am getting the error attached in screenshot.我在离子2中运行项目构建时遇到错误，尽管我已经安装了＆＃39; typings＆＃39;使用以下命令

npm install -g typings typings, install dt~cordova --save --global

并尝试了每种可能的方法来删除此错误，检查所有cordova插件，如文件，文件传输但仍然无法解决错误。

任何人都可以找到它。

这里附有代码，我也不知道我哪里出错......

Answer 1

我已经编辑了你的代码，添加了declare let cordova: any;这暴露了cordova api以供使用。希望这有帮助。

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import {Component} from '@angular/core';
import {NavController, Platform, AlertController} from 'ionic-angular';
import {Transfer, TransferObject} from '@ionic-native/transfer';
import {File} from '@ionic-native/file';

declare let cordova: any;

@Component({
  selector: 'page-about',
  templateUrl: 'about.html',
  providers: [Transfer, TransferObject, File]
})
export class AboutPage {

  storageDirectory: string = '';

  constructor(public navCtrl: NavController, public platform: Platform, private transfer: Transfer, private file: File, public alertCtrl: AlertController) {
    this.platform.ready().then(() => {
      // make sure this is on a device, not an emulation (e.g. chrome tools device mode)
      if(!this.platform.is('cordova')) {
        return false;
      }

      if (this.platform.is('ios')) {
        this.storageDirectory = cordova.file.documentsDirectory;
      }
      else if(this.platform.is('android')) {
        this.storageDirectory = cordova.file.externalDataDirectory;
		console.log(this.storageDirectory);
      }
      else {
        // exit otherwise, but you could add further types here e.g. Windows
        return false;
      }
    });
  }
  
   downloadImage() {

    this.platform.ready().then(() => {

      const fileTransfer: TransferObject = this.transfer.create();

      const imageLocation = 'http://html5demos.com/assets/dizzy.mp4';

      fileTransfer.download(imageLocation, this.storageDirectory + 'dizzy.mp4').then((entry) => {
       
	   const alertSuccess = this.alertCtrl.create({
          title: `Download Succeeded!`,
          subTitle: `successfully downloaded to: ${entry.toURL()}`,
          buttons: ['Ok']
        });

        alertSuccess.present();

      }, (error) => {

        const alertFailure = this.alertCtrl.create({
          title: `Download Failed!`,
          subTitle: `was not downloaded. Error code: ${error}`,
          buttons: ['Ok']
        });

        alertFailure.present();

      });

    });

  }


}

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Answer 2

您必须在cordova文件中声明src/declarations.d.ts命名空间，以便typescript转换器可以理解cordova被声明并引用到Object，但在您的情况下，如果您想使用插件，则更好使用ionic-native如果插件没有列在那里，请声明插件的命名空间并使用它。