小编oco*_*ova的帖子

我将检查某个变量是字符串还是数字。如果值是字符串，我使用parseInt()返回NaN（非数字）的函数。但是，当我尝试在 if 语句中检查它时，它看起来"NaN"不能将输出视为要检查的有效条件。猜猜为什么？

function tsCalculate() {
  var string = "Monday";
  var number = 1;
  Logger.log(string);
  Logger.log(number);
  Logger.log("String after parseInt: " + parseInt(string, 10));
  Logger.log("Number after parseInt: " + parseInt(number, 10));
  if ("NaN" == parseInt(string, 10))
  {
    Logger.log("doesn't work");
  }
}

我创建了一个controller在每个组件中全局使用的插件，但我无法使其与 Vue 3 + TypeScript + Composition API 一起使用我收到 TypeScript 错误

用户界面/插件/controllers.ts

import { App } from 'vue'
import { provider, IProvider } from '@/core/presentation/provider'

export default {
  install: (app: App) => {
    const controllers: IProvider = provider()
    app.provide('controllers', controllers)
  }
}

主要.ts

import { createApp } from 'vue'
import { controllers } from './ui'

createApp(App)
  .use(controllers)
  .mount('#app')

@/core/presentation/provider/provider.ts

import { UserController } from '../controllers'
import { IProvider } from './provider.types'

export const provider = (): IProvider => …