使用带有 angular11 的 autoprefixer

Question

我将 angular11 与SCSS一起使用。 例如，我有以下 class ：

.freeSpace {
    flex: 1;
    display: flex;
    align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

但是，当我做ng build --prod它并没有转向：

.freeSpace {
    -webkit-box-flex: 1;
        -ms-flex: 1;
            flex: 1;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

如何强制 angular 使用自动前缀？

我的angular.json文件：

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "we19-app": {
      "projectType": "application",
      "schematics": {
        "@schematics/angular:component": {
          "style": "scss",
          "skipTests": true
        }
      },
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "../backend/angular",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "aot": true,
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "namedChunks": false,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "6kb",
                  "maximumError": "10kb"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "we19-app:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "we19-app:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "we19-app:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.spec.json",
            "karmaConfig": "karma.conf.js",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.scss"
            ],
            "scripts": []
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "tsconfig.app.json",
              "tsconfig.spec.json",
              "e2e/tsconfig.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        },
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "we19-app:serve"
          },
          "configurations": {
            "production": {
              "devServerTarget": "we19-app:serve:production"
            }
          }
        }
      }
    }
  },
  "defaultProject": "we19-app"
}

我希望我的最终scss文件看起来像前缀。 当我在浏览器中打开我的应用程序时，会显示“常规”（未转换为自动前缀代码）scss 代码。

此外，当我手动将以下内容附加到我的 scss 时：

.freeSpace {
    -webkit-box-flex: 1;
        -ms-flex: 1;
            flex: 1;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

当我ng build --prod并在我的浏览器中查看应用程序时，所有这些“额外的”scss（例如display: -ms-flexbox ）都被省略了

我的.browserslistrc：

# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
# For additional information regarding the format and rule options, please see:
# https://github.com/browserslist/browserslist#queries

# For the full list of supported browsers by the Angular framework, please see:
# https://angular.io/guide/browser-support

# You can see what browsers were selected by your queries by running:
#   npx browserslist

last 1 Chrome version
last 1 Firefox version
last 2 Edge major versions
last 2 Safari major versions
last 2 iOS major versions
Firefox ESR
not IE 11 # Angular supports IE 11 only as an opt-in. To opt-in, remove the 'not' prefix on this line.

Answer 1

您可以按如下方式修改.browserslistrc文件

Safari 6
IE 10

这导致以下 css

.freeSpace {
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
    -ms-flex-align: end;
    align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

Answer 2

如果你查看angular 的支持页面，你会看到它只支持最近的浏览器。

因此，如果您构建您的应用程序，它只会添加必要的前缀。 如果您检查对 flexbox 的支持，您将看到所有当前浏览器都支持display: flex 。 display: -ms-box仅 IE10 支持，angular 不支持。 所以用不必要的前缀来膨胀你的 CSS 是没有意义的。 这就是它被过滤掉的原因。