jacob-lcs

let storage = window.localStorage;

/**
 * 判断是否为 JSON 对象
 * @param obj
 * @returns {boolean}
 */
function isJSON(obj) {
    obj = JSON.stringify(obj);
    return /^\{[\s\S]*\}$/.test(obj);

jacob-lcs

// 方法一，非异步方式
const supportWebP = (function () {
  var canvas = typeof document === 'object' ? document.createElement('canvas') : {}
  canvas.width = canvas.height = 1
  return canvas.toDataURL ? canvas.toDataURL('image/webp').indexOf('image/webp') === 5 : false
})()

// 异步方式获取，比较适合系统中存在一个系统变量来保存结果
window.isSupportWebp = false; // 是否支持
(function() {

jacob-lcs

class PriorityQueue {
  #top = 0;
  #heap;
  #comparator;
  
  constructor(comparator = (a, b) => a > b) {
    this.#heap = [];
    this.#comparator = comparator;
  }
  #parent(i) {

jacob-lcs

import { useEffect, useRef } from 'react'

function useInterval(callback, delay) {
  const savedCallback = useRef(callback)

  // Remember the latest callback if it changes.
  useEffect(() => {
    savedCallback.current = callback
  }, [callback])