NotionNext/lib/utils.js

// 封装异步加载资源的方法
import { memo } from 'react'

/**
 * 组件持久化
 */
export const memorize = (Component) => {
  const MemoizedComponent = (props) => {
    return <Component {...props} />
  }
  return memo(MemoizedComponent)
}
/**
 * 加载外部资源
 * @param url 地址 例如 https://xx.com/xx.js
 * @param type js 或 css
 * @returns {Promise<unknown>}
 */
export function loadExternalResource(url, type) {
  // 检查是否已存在
  const elements = document.querySelectorAll(`[href='${url}']`)
  if (elements.length > 0 || !url) {
    return
  }
  return new Promise((resolve, reject) => {
    let tag

    if (type === 'css') {
      tag = document.createElement('link')
      tag.rel = 'stylesheet'
      tag.href = url
    } else if (type === 'font') {
      tag = document.createElement('link')
      tag.rel = 'preload'
      tag.as = 'font'
      tag.href = url
    } else if (type === 'js') {
      tag = document.createElement('script')
      tag.src = url
    }
    if (tag) {
      tag.onload = () => resolve(url)
      tag.onerror = () => reject(url)
      document.head.appendChild(tag)
    }
  })
}

/**
 * 查询url中的query参数
 * @param {}} variable
 * @returns
 */
export function getQueryVariable(key) {
  const query = isBrowser() ? window.location.search.substring(1) : ''
  const vars = query.split('&')
  for (let i = 0; i < vars.length; i++) {
    const pair = vars[i].split('=')
    if (pair[0] === key) { return pair[1] }
  }
  return (false)
}

/**
 * 获取 URL 中指定参数的值
 * @param {string} url
 * @param {string} param
 * @returns {string|null}
 */
export function getQueryParam(url, param) {
  const searchParams = new URLSearchParams(url.split('?')[1])
  return searchParams.get(param)
}

/**
 * 深度合并两个对象
 * @param target
 * @param sources
 */
export function mergeDeep(target, ...sources) {
  if (!sources.length) return target
  const source = sources.shift()

  if (isObject(target) && isObject(source)) {
    for (const key in source) {
      if (isObject(source[key])) {
        if (!target[key]) Object.assign(target, { [key]: {} })
        mergeDeep(target[key], source[key])
      } else {
        Object.assign(target, { [key]: source[key] })
      }
    }
  }
  return mergeDeep(target, ...sources)
}

/**
 * 是否对象
 * @param item
 * @returns {boolean}
 */
export function isObject(item) {
  return (item && typeof item === 'object' && !Array.isArray(item))
}

/**
 * 是否可迭代
 * @param {*} obj
 * @returns
 */
export function isIterable(obj) {
  return obj != null && typeof obj[Symbol.iterator] === 'function'
}

/**
 * 深拷贝对象
 * 根据源对象类型深度复制，支持object和array
 * @param {*} obj
 * @returns
 */
export function deepClone(obj) {
  if (Array.isArray(obj)) {
    // If obj is an array, create a new array and deep clone each element
    return obj.map(item => deepClone(item))
  } else if (obj && typeof obj === 'object') {
    const newObj = {}
    for (const key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key)) {
        if (obj[key] instanceof Date) {
          newObj[key] = new Date(obj[key].getTime()).toISOString()
        } else {
          newObj[key] = deepClone(obj[key])
        }
      }
    }
    return newObj
  } else {
    return obj
  }
}
/**
 * 延时
 * @param {*} ms
 * @returns
 */
export const delay = ms => new Promise(resolve => setTimeout(resolve, ms))

/**
 * 判断是否客户端
 * @returns {boolean}
 */
export const isBrowser = () => typeof window !== 'undefined'

/**
 * 获取从第1页到指定页码的文章
 * @param pageIndex 第几页
 * @param list 所有文章
 * @param pageSize 每页文章数量
 * @returns {*}
 */
export const getListByPage = function (list, pageIndex, pageSize) {
  return list.slice(
    0,
    pageIndex * pageSize
  )
}

/**
 * 判断是否移动设备
 */
export const isMobile = () => {
  let isMobile = false
  if (!isBrowser()) {
    return isMobile
  }

  // 这个判断会引发 TypeError: navigator.userAgentData.mobile is undefined 问题，导致博客无法正常工作
  // if (!isMobile && navigator.userAgentData.mobile) {
  //   isMobile = true
  // }

  if (!isMobile && (/Mobi|Android|iPhone/i.test(navigator.userAgent))) {
    isMobile = true
  }

  if (/Android|iPhone|iPad|iPod/i.test(navigator.platform)) {
    isMobile = true
  }

  if (typeof window.orientation !== 'undefined') {
    isMobile = true
  }

  return isMobile
}