虽然我在编译时使用ng build --prod创建生产构建，但在开发模式下工作得很好，我该如何解决这个问题？
我在很多地方使用.toLowerCase()，我如何确定这个方法到底在哪里导致错误，或者这个方法实际上是在导致错误，因为如果它导致错误，那么在开发的情况下也应该存在。请帮助我确定问题的确切原因
获取以下错误：
chunk {} runtime.acf0dec4155e77772545.js (runtime) 1.45 kB [entry] [rendered]
chunk {1} main.82b46379c162ae4d74cf.js (main) 147 kB [initial] [rendered]
chunk {2} polyfills.4503f8e2df6ab08e9ee5.js (polyfills) 130 bytes [initial] [rendered]
chunk {3} styles.c90132e48ef115ac4fd0.css (styles) 3.91 kB [initial] [rendered]
chunk {scripts} scripts.f8926a8840b29b228587.js (scripts) 587 kB [entry] [rendered]
Date: 2020-12-21T17:39:25.893Z - Hash: cfeb9076f180357d8675 - Time: 41679ms
ERROR in Cannot read property 'toLowerCase' of undefined
package.json
{
"name": "project4",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "~10.1.4",
"@angular/cdk": "^10.2.7",
"@angular/common": "~10.1.4",
"@angular/compiler": "~10.1.4",
"@angular/core": "~10.1.4",
"@angular/forms": "~10.1.4",
"@angular/material": "^10.2.7",
"@angular/platform-browser": "~10.1.4",
"@angular/platform-browser-dynamic": "~10.1.4",
"@angular/router": "~10.1.4",
"alife-file-to-base64": "0.0.4",
"amazon-cognito-identity-js": "^4.4.0",
"apexcharts": "^3.23.0",
"aws-sdk": "^2.784.0",
"bootstrap": "^4.5.3",
"crypto-js": "^3.3.0",
"jquery": "^3.5.1",
"ng-apexcharts": "^1.5.6",
"ngx-cookie-service": "^10.1.1",
"ngx-image-cropper": "^3.2.1",
"ngx-owl-carousel": "^2.0.7",
"ngx-pagination": "^5.0.0",
"ngx-spinner": "^10.0.1",
"rxjs": "~6.6.0",
"tslib": "^2.0.0",
"zone.js": "~0.10.2"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.1001.4",
"@angular/cli": "~10.1.4",
"@angular/compiler-cli": "~10.1.4",
"@types/node": "^12.11.1",
"@types/jasmine": "~3.5.0",
"@types/jasminewd2": "~2.0.3",
"codelyzer": "^6.0.0",
"jasmine-core": "~3.6.0",
"jasmine-spec-reporter": "~5.0.0",
"karma": "~5.0.0",
"karma-chrome-launcher": "~3.1.0",
"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",
"tslint": "~6.1.0",
"typescript": "~4.0.2"
}
}
angular.json
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"project4": {
"projectType": "application",
"schematics": {},
"root": "",
"sourceRoot": "src",
"prefix": "app",
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/project4",
"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": [
"node_modules/owl.carousel/dist/assets/owl.carousel.css",
"node_modules/owl.carousel/dist/assets/owl.theme.default.css",
"src/styles.css"
],
"scripts": ["node_modules/jquery/dist/jquery.js",
"node_modules/apexcharts/dist/apexcharts.min.js",
"node_modules/owl.carousel/dist/owl.carousel.js"]
},
"configurations": {
"production": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"optimization": true,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"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": "project4:build"
},
"configurations": {
"production": {
"browserTarget": "project4:build:production"
}
}
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"browserTarget": "project4: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": [
"./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
"src/styles.css"
],
"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": "project4:serve"
},
"configurations": {
"production": {
"devServerTarget": "project4:serve:production"
}
}
}
}
}
},
"defaultProject": "project4",
"cli": {
"analytics": false
}
}
我能够通过将优化更改为true来解决它。我不知道它是如何运作的，但它最终解决了这个问题。关闭它会对生产环境产生影响吗？
使用"；"优化"：在angular.json中设置true。这是为了更方便地调试。
打开dist文件夹中生成的style.css文件，检查它是否有错误(如果您在docker容器中开发，请将该文件从容器复制到主机(。
当你发现这样的语法错误时：在这里输入图像描述，尝试将生成的style.css中的错误代码与源代码匹配，并修复那里的问题。
我在运行ng build --prod命令时遇到了与Angular 11相同的问题：
Module build failed (from ./node_modules/@ngtools/webpack/src/ivy/index.js):
Error: /../../example.component.less Cannot read property 'toLowerCase' of undefined
因此，我在示例.component.less文件中发现，一些css属性没有定义，并且生产模式中的angular编译器更严格，请查看：
.card-container {
width: 50%;
height: 40%;
border: ; <<< Here <<<
text-align: center;
overflow: auto;
}