如何将自己的node.js脚本添加到Angular 4项目

Question

我有一个文件function.js，它导出函数以与一些api通讯并返回值。 它使用请求库进行通信。 我在node.js应用程序中使用它。 如何在我的angular 4应用程序中导入/使用它？

我以为将此文件安装为node_module。 因此，我创建了新的文件夹函数，即function.js，package-json和node_modules文件夹。 然后通过命令将其安装在ng4应用中

npm install --save ./function 

然后在types.d.ts中声明

declare var Myfunction: any

并将其导入我的组件中

import * as Myfunction from "function"

但是当我尝试使用它时，我得到一个错误：

ERROR in /Users/i343346/order-site/src/app/order/order.component.ts (37,12): Unexpected token. A constructor, method, accessor, or property was expected.
ERROR in /Users/i343346/order-site/src/app/order/order.component.ts (37,13): Function implementation is missing or not immediately following the declaration.

更新我尝试了@Z。 Bagley answear，现在我可以导入文件了。 但出现错误：

WARNING in ./node_modules/ajv/lib/compile/index.js 13:21-34 Critical dependency: the request of a dependency is an expression
at CommonJsRequireContextDependency.getWarnings (/Users/i343346/order-site/node_modules/webpack/lib/dependencies/CommonJsRequireContextDependency.js:27:4)
at Compilation.reportDependencyErrorsAndWarnings (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:677:24)
at Compilation.finish (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:535:9)
at applyPluginsParallel.err (/Users/i343346/order-site/node_modules/webpack/lib/Compiler.js:512:17)
at /Users/i343346/order-site/node_modules/tapable/lib/Tapable.js:289:11
at _addModuleChain (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:481:11)
at processModuleDependencies.err (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:452:13)
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickCallback (internal/process/next_tick.js:104:9)

WARNING in ./node_modules/ajv/lib/async.js 96:20-33 Critical dependency: the request of a dependency is an expression
at CommonJsRequireContextDependency.getWarnings (/Users/i343346/order-site/node_modules/webpack/lib/dependencies/CommonJsRequireContextDependency.js:27:4)
at Compilation.reportDependencyErrorsAndWarnings (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:677:24)
at Compilation.finish (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:535:9)
at applyPluginsParallel.err (/Users/i343346/order-site/node_modules/webpack/lib/Compiler.js:512:17)
at /Users/i343346/order-site/node_modules/tapable/lib/Tapable.js:289:11
at _addModuleChain (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:481:11)
at processModuleDependencies.err (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:452:13)
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickCallback (internal/process/next_tick.js:104:9)

WARNING in ./node_modules/ajv/lib/async.js 119:15-28 Critical dependency: the request of a dependency is an expression
at CommonJsRequireContextDependency.getWarnings (/Users/i343346/order-site/node_modules/webpack/lib/dependencies/CommonJsRequireContextDependency.js:27:4)
at Compilation.reportDependencyErrorsAndWarnings (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:677:24)
at Compilation.finish (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:535:9)
at applyPluginsParallel.err (/Users/i343346/order-site/node_modules/webpack/lib/Compiler.js:512:17)
at /Users/i343346/order-site/node_modules/tapable/lib/Tapable.js:289:11
at _addModuleChain (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:481:11)
at processModuleDependencies.err (/Users/i343346/order-site/node_modules/webpack/lib/Compilation.js:452:13)
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickCallback (internal/process/next_tick.js:104:9) 

我认为是与请求库连接的，浏览器可能不支持。

Answer 1

在Angular 4项目中包含自定义javascript函数的一种简单方法是将该项目包含在资产文件夹中，然后使用require将其导入到组件打字稿中。

SRC /资产/ example.js

export function test() {
    console.log('test');
}

SRC /应用程序/ app.component.ts

（在@Component(...)之前）

declare var require: any;
const example = require('../assets/example');

（在export class AppComponent implements OnInit { ...内部export class AppComponent implements OnInit { ... ）

ngOnInit() {
  example.test();
}

Answer 2

我认为您可能还需要通过脚本标记将代码包含在index.html中。

您可能会发现此其他答案很有用： https : //stackoverflow.com/posts/40635697/edit