javascript - 无法从 node_modules 动态加载脚本

Question

我使用这个标准方法来动态加载脚本。

import {Injectable} from "@angular/core";
import {ScriptStore} from "./script.store";

declare var document: any;

@Injectable()
export class ScriptService {

private scripts: any = {};

constructor() {
    ScriptStore.forEach((script: any) => {
        this.scripts[script.name] = {
            loaded: false,
            src: script.src
        };
    });
}

load(...scripts: string[]) {
    var promises: any[] = [];
    scripts.forEach((script) => promises.push(this.loadScript(script)));
    return Promise.all(promises);
}

loadScript(name: string) {
    return new Promise((resolve, reject) => {
        //resolve if already loaded
        if (this.scripts[name].loaded) {
            resolve({script: name, loaded: true, status: 'Already Loaded'});
        }
        else {
            //load script
            let script = document.createElement('script');
            script.type = 'text/javascript';
            script.src = this.scripts[name].src;
            if (script.readyState) {  //IE
                script.onreadystatechange = () => {
                    if (script.readyState === "loaded" || script.readyState === "complete") {
                        script.onreadystatechange = null;
                        this.scripts[name].loaded = true;
                        resolve({script: name, loaded: true, status: 'Loaded'});
                    }
                };
            } else {  //Others
                script.onload = () => {
                    this.scripts[name].loaded = true;
                    resolve({script: name, loaded: true, status: 'Loaded'});
                };
            }
            script.onerror = (error: any) => resolve({script: name, loaded: false, status: 'Loaded'});
            document.getElementsByTagName('head')[0].appendChild(script);
        }
    });
}

}

问题是它只适用于外部路径。使用此设置，我无法加载 bootstrap-datepicker.js，但它会在“https://cdnjs.cloudflare.com/”时加载。 ...' 用来。谁能帮忙？我应该以某种方式使用路由使该脚本可用吗？

interface Scripts {
  name: string;
  src: string;
}
export const ScriptStore: Scripts[] = [
  { name: "paypal", src: "https://www.paypalobjects.com/api/checkout.min.js" },
  {
    name: "datepicker",
      src: "../../../../node_modules/bootstrap-datepicker/js/bootstrap-datepicker.js"
      //"https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.9.0/js/bootstrap-datepicker.min.js"
  },
  {
    name: "datepickerEs",
    src:
      "https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.9.0/locales/bootstrap-datepicker.es.min.js"
  }
];

Answer 1

不，您应该通过您的 Assets 提供该脚本。

node_modules 中的脚本被编译 和捆绑 以单个脚本结束，通常是vendor.js。如果你只有一个脚本文件，那么你就不能对其使用延迟加载。

为此，从节点模块中提取脚本，将其放在 Assets 文件夹中，然后使用该脚本位置进行延迟加载。