我目前正在構建我的第一個 Ionic 應用程式，它應該包括一個 QR 碼掃描儀。
這是我的 package.ts
{
"name": "drink-inc",
"version": "0.0.1",
"author": "Ionic Framework",
"homepage": "https://ionicframework.com/",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/cdk": "^13.3.4",
"@angular/common": "~13.2.2",
"@angular/core": "~13.2.2",
"@angular/fire": "^7.3.0",
"@angular/flex-layout": "^13.0.0-beta.38",
"@angular/forms": "~13.2.2",
"@angular/platform-browser": "~13.2.2",
"@angular/platform-browser-dynamic": "~13.2.2",
"@angular/router": "~13.2.2",
"@awesome-cordova-plugins/barcode-scanner": "^5.41.0",
"@capacitor/android": "^3.5.0",
"@capacitor/app": "1.1.1",
"@capacitor/core": "3.5.0",
"@capacitor/haptics": "1.1.4",
"@capacitor/keyboard": "1.2.2",
"@capacitor/status-bar": "1.0.8",
"@ionic/angular": "^6.0.0",
"firebase": "^9.6.11",
"ngx-cookie-service": "^13.2.0",
"phonegap-plugin-barcodescanner": "^8.1.0",
"rxjs": "~6.6.0",
"tslib": "^2.2.0",
"zone.js": "~0.11.4"
},
"devDependencies": {
"@angular-devkit/build-angular": "~13.2.3",
"@angular-eslint/builder": "~13.0.1",
"@angular-eslint/eslint-plugin": "~13.0.1",
"@angular-eslint/eslint-plugin-template": "~13.0.1",
"@angular-eslint/template-parser": "~13.0.1",
"@angular/cli": "~13.2.3",
"@angular/compiler": "~13.2.2",
"@angular/compiler-cli": "~13.2.2",
"@angular/language-service": "~13.2.2",
"@capacitor/cli": "3.5.0",
"@ionic/angular-toolkit": "^6.0.0",
"@types/jasmine": "~3.6.0",
"@types/jasminewd2": "~2.0.3",
"@types/node": "^12.11.1",
"@typescript-eslint/eslint-plugin": "5.3.0",
"@typescript-eslint/parser": "5.3.0",
"eslint": "^7.6.0",
"eslint-plugin-import": "2.22.1",
"eslint-plugin-jsdoc": "30.7.6",
"eslint-plugin-prefer-arrow": "1.2.2",
"jasmine-core": "~3.8.0",
"jasmine-spec-reporter": "~5.0.0",
"karma": "~6.3.2",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage": "~2.0.3",
"karma-coverage-istanbul-reporter": "~3.0.2",
"karma-jasmine": "~4.0.0",
"karma-jasmine-html-reporter": "^1.5.0",
"protractor": "~7.0.0",
"ts-node": "~8.3.0",
"typescript": "~4.4.4"
},
"description": "An Ionic project"
}
所以我想通過電容器添加Cordova 條形碼掃描儀插件。
起初我安裝了插件，如指南所述：
$ npm install phonegap-plugin-barcodescanner
$ npm install @awesome-cordova-plugins/barcode-scanner
$ ionic cap sync
之后實作了一個非常基本的條碼掃描器版本：
import { Component, OnInit } from "@angular/core";
import { NgForm } from "@angular/forms";
import { BarcodeScanner } from "@awesome-cordova-plugins/barcode-scanner/ngx";
@Component({
selector: "app-home",
templateUrl: "./home.page.html",
styleUrls: ["./home.page.scss"],
})
export class HomePage implements OnInit {
constructor(
private barcodeScanner: BarcodeScanner
) {}
joinBarcodeRoom() {
this.barcodeScanner.scan().then((data) => {
console.log(data);
});
}
}
之后，我必須將其包含BarcodeScanner在我的 providers 陣列中app.component.module，它在 android 模擬器上運行得非常好。
但是，在瀏覽器中運行代碼會產生以下錯誤：
Native: tried calling BarcodeScanner.scan, but Cordova is not available. Make sure to include cordova.js or run in a device/simulator
core.mjs:6485 ERROR Error: Uncaught (in promise): cordova_not_available
at resolvePromise (zone.js:1262:1)
at resolvePromise (zone.js:1216:1)
at zone.js:1329:1
at _ZoneDelegate.push.3484._ZoneDelegate.invokeTask (zone.js:443:1)
at Object.onInvokeTask (core.mjs:25535:1)
at _ZoneDelegate.push.3484._ZoneDelegate.invokeTask (zone.js:442:1)
at Zone.push.3484.Zone.runTask (zone.js:214:1)
at drainMicroTaskQueue (zone.js:632:1)
at ZoneTask.push.3484.ZoneTask.invokeTask [as invoke] (zone.js:529:1)
at invokeTask (zone.js:1714:1)
有沒有辦法解決這個錯誤？如果我必須包括 Cordova，那對性能不是很糟糕嗎？
uj5u.com熱心網友回復：
Capacitor 不支持 web 上的 cordova 插件，僅支持 iOS 和 Android。
uj5u.com熱心網友回復：
由于您添加了很棒的 cordova 插件，您必須將其添加到 app.module.ts 提供程式陣列中。
import { BarcodeScanner } from "@awesome-cordova-plugins/barcode-scanner/ngx";
...
providers:[BarcodeScanner]
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