(地址：https://github.com/mdn/translated-content/issues/new?mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fko%2Fdocs%2FWeb%2FJavaScript%2FReference%2FGlobal_Objects%2FString%2Fsub&template=page-report-ko.yml，错误代码：CONNECTION_FAILED)