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在 TypeScript中扩展String字符串原型prototype

 2 years ago
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更新于 2021/07/31 |  创建于 2021/07/31

在 TypeScript中扩展String字符串原型prototype

在Typescript中如果你在javascript原型prototype中添加方法，Typescript是不会检测到的，当这种情况发生时，你需要显式的告知Typescript，只有才不会让全局原型prototype出现混乱。

要显式修改全局接口，请使用declare global ，下面的示例中修改String原型prototype，并在String原型prototype中添加capitalize方法

declare global {
  interface String {
    capitalize(this: string): string;
  }
}

String.prototype.capitalize = function () {
  return this.charAt(0).toUpperCase() + this.slice(1);
};

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