NG_PERSISTENT_BUILD_CACHE=1ng服務不作業

我正在嘗試使用 angular 提供的持久構建快取功能，但看起來它對我不起作用，我正在嘗試以下命令

NG_PERSISTENT_BUILD_CACHE=1 ng serve

它總是回傳以下錯誤

'NG_PERSISTENT_BUILD_CACHE' 不是內部或外部命令、可運行程式或批處理檔案。

我正在使用 Angular cli 版本 12.2.15。我不確定我錯過了什么。下面是我的 packages.json 檔案

"dependencies": {
    "@agm/core": "^1.1.0",
    "@angular-devkit/core": "^12.2.15",
    "@angular/animations": "^12.2.15",
    "@angular/common": "^12.2.15",
    "@angular/compiler": "^12.2.15",
    "@angular/core": "^12.2.15",
    "@angular/forms": "^12.2.15",
    "@angular/platform-browser": "^12.2.15",
    "@angular/platform-browser-dynamic": "^12.2.15",
    "@angular/platform-server": "^12.2.15",
    "@angular/pwa": "^0.1100.2",
    "@angular/router": "^12.2.15",
    "@angular/service-worker": "^12.2.15",
    "@auth0/angular-jwt": "5.0.2",
    "@ng-bootstrap/ng-bootstrap": "^8.0.0",
    "@nguniversal/module-map-ngfactory-loader": "^8.1.1",
    "@ngx-translate/core": "^13.0.0",
    "@ngx-translate/http-loader": "^6.0.0",
    "@types/ckeditor": "^4.9.10",
    "@types/hammerjs": "^2.0.36",
    "@types/jest": "^26.0.15",
    "@types/node": "^14.14.10",
    "@types/papaparse": "^5.3.1",
    "@webcomponents/shadydom": "^1.9.0",
    "acorn": "^8.0.4",
    "angular-chart.js": "^1.1.1",
    "angular-file-uploader": "7.0.3",
    "angular-mydatepicker": "^0.10.2",
    "angular-ng-autocomplete": "^2.0.1",
    "angular-split": "4.0.0",
    "angular2-datetimepicker": "^1.1.1",
    "angular2-text-mask": "9.0.0",
    "aspnet-prerendering": "^3.0.1",
    "bootstrap": "^4.5.3",
    "ckeditor": "4.12.1",
    "core-js": "^3.8.0",
    "events": "^3.2.0",
    "export-to-csv": "^0.2.1",
    "first": "0.0.3",
    "fullcalendar": "^4.0.0-alpha.4",
    "fullcalendar-scheduler": "^4.0.0-alpha.4",
    "hammerjs": "^2.0.8",
    "highcharts": "^8.2.2",
    "html2canvas": "^1.0.0-rc.7",
    "jquery": "^3.5.1",
    "jspdf": "^2.1.1",
    "jw-angular-social-buttons": "^1.0.0",
    "mdn-polyfills": "^5.20.0",
    "moment-mini-ts": "^2.20.1",
    "ng-multiselect-dropdown": "^0.2.10",
    "ng2-ckeditor": "^1.2.9",
    "ng2-date-picker": "11.0.0",
    "ng2-pdf-viewer": "6.2.0",
    "ng2-slim-loading-bar": "^4.0.0",
    "ng4-loading-spinner": "^1.2.3",
    "ng5-slider": "^1.2.6",
    "ng9-password-strength-bar": "^1.0.0",
    "ngx-bootstrap": "6.2.0",
    "ngx-color-picker": "^10.1.0",
    "ngx-countdown": "11.0.0",
    "ngx-device-detector": "^1.5.2",
    "ngx-drag-drop": "^2.0.0",
    "ngx-fullcalendar": "^5.0.0-alpha.1",
    "ngx-hm-sortable": "^1.0.0",
    "ngx-img-cropper": "^10.0.0",
    "ngx-infinite-scroll": "^10.0.0",
    "ngx-mask": "11.1.4",
    "ngx-mega-simple-drag-drop-list": "^1.0.8",
    "ngx-order-pipe": "^2.1.1",
    "ngx-papaparse": "^5.0.0",
    "ngx-print": "^1.2.0-beta.5",
    "ngx-select-dropdown": "^1.4.4",
    "ngx-sortable": "^1.0.3",
    "ngx-sortablejs": "^10.0.0",
    "ngx-toastr": "^13.1.0",
    "papaparse": "^5.3.0",
    "pdfjs-dist": "2.3.200",
    "rxjs": "^6.6.3",
    "rxjs-compat": "^6.6.3",
    "signature_pad": "^3.0.0-beta.4",
    "sortablejs": "^1.12.0",
    "ts-deferred": "^1.0.4",
    "tslib": "^2.2.0",
    "webpack-bundle-analyzer": "^4.1.0",
    "xlsx": "^0.17.4",
    "zone.js": "~0.11.4",
    "zxcvbn": "^4.4.2"
  },

這是我使用ng v命令檢查包版本時的快照

uj5u.com熱心網友回復：

您似乎正在使用 Windowscmd來運行該命令，因此您遇到了錯誤。

命令：

NG_PERSISTENT_BUILD_CACHE=1 ng serve

適用于類 Unix 系統，不適用于 Windows cmd。

您可以使用以下任何一種方法使其作業：

• 首先設定環境變數，然后運行命令

// 1st command to set the environment variable
set NG_PERSISTENT_BUILD_CACHE=1

// 2nd command
ng serve

• 在一個步驟中運行這兩個命令

set NG_PERSISTENT_BUILD_CACHE=1&&ng serve

• 在 package.json 腳本中添加以下命令，然后運行 npm start

"scripts": {
  "start": "set NG_PERSISTENT_BUILD_CACHE=1&&ng serve",
  ...
}

PS：在上述所有方法中，環境變數值都是為cmd我們運行命令的會話設定的。如果要全域設定環境變數，則可以通過在環境變數對話框中添加系統變數來實作。（系統屬性-> 環境變數-> 系統變數）。

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