在angular中挂载函数到原型链

在environment.ts文件中

declare global {
  interface String {
    test(c: number): string;
  }
  interface Array<T> {
    test(c: number): string;
  }
  interface Array<T> {
    every2(callbackfn: any, thisArg: any);
  }
}
String.prototype.test = function (c: number) {
  return "abc";
}

Array.prototype.test = function (c: number) {
  return "123";
}