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<!DOCTYPE html>
<html lang="zh-CN" data-default-color-scheme="auto">
<head>
<meta charset="UTF-8">
<link rel="apple-touch-icon" sizes="76x76" href="/img/favicon.png">
<link rel="icon" href="/img/favicon.png">
<meta name="viewport"
content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="theme-color" content="#2f4154">
<meta name="description" content="">
<meta name="author" content="Fan">
<meta name="keywords" content="">
<title>PolarBear</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css" />
<!-- 主题依赖的图标库，不要自行修改 -->
<link rel="stylesheet" href="//at.alicdn.com/t/font_1749284_ba1fz6golrf.css">
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<link rel="stylesheet" href="/css/main.css" />
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<script id="fluid-configs">
var Fluid = window.Fluid || {};
var CONFIG = {"hostname":"example.com","root":"/","version":"1.8.11","typing":{"enable":true,"typeSpeed":70,"cursorChar":"_","loop":false},"anchorjs":{"enable":true,"element":"h1,h2,h3,h4,h5,h6","placement":"right","visible":"hover","icon":""},"progressbar":{"enable":true,"height_px":3,"color":"#29d","options":{"showSpinner":false,"trickleSpeed":100}},"copy_btn":true,"image_zoom":{"enable":true,"img_url_replace":["",""]},"toc":{"enable":true,"headingSelector":"h1,h2,h3,h4,h5,h6","collapseDepth":0},"lazyload":{"enable":true,"loading_img":"/img/loading.gif","onlypost":false,"offset_factor":2},"web_analytics":{"enable":false,"baidu":null,"google":null,"gtag":null,"tencent":{"sid":null,"cid":null},"woyaola":null,"cnzz":null,"leancloud":{"app_id":null,"app_key":null,"server_url":null}},"search_path":"/local-search.xml"};
</script>
<script src="/js/utils.js" ></script>
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<meta name="generator" content="Hexo 5.4.0"></head>
<body>
<header style="height: 100vh;">
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<a class="navbar-brand"
href="/"> <strong>PolarBear</strong> </a>
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data-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
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<ul class="navbar-nav ml-auto text-center">
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</a>
</li>
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<a class="nav-link" target="_self" data-toggle="modal" data-target="#modalSearch"> <i
class="iconfont icon-search"></i> </a>
</li>
<li class="nav-item" id="color-toggle-btn">
<a class="nav-link" target="_self"> <i
class="iconfont icon-dark" id="color-toggle-icon"></i> </a>
</li>
</ul>
</div>
</div>
</nav>
<div class="banner" id="banner" parallax=true
style="background: url('/img/default.png') no-repeat center center;
background-size: cover;">
<div class="full-bg-img">
<div class="mask flex-center" style="background-color: rgba(0, 0, 0, 0.3)">
<div class="page-header text-center fade-in-up">
<span class="h2" id="subtitle" title="北极熊的学习博客">
</span>
</div>
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</div>
</div>
</div>
</div>
</header>
<main>
<div class="container nopadding-x-md">
<div class="py-5" id="board"
style=margin-top:0>
<div class="container">
<div class="row">
<div class="col-12 col-md-10 m-auto">
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/09/24/module/" target="_self">
commonJS与ES6 module的区别
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/09/24/module/" target="_self">
commonJS 模块commonJS的模块规范在Node中发扬光大，总的来说，它的特性有这几个：
1.动态加载模块commonJS和es6的最大区别大概就在于此了吧，commonJS模块的动态加载能够很轻松的实现懒加载，优化用户体验。
2.加载整个模块commonJS模块中，导出的是整个模块。
3.每个模块皆为对象commonJS模块都被视作一个对象。
4.值拷贝commonJS的模块输出和 函
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-09-24 15:48" pubdate>
2021-09-24
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/09/24/promise/" target="_self">
promise全家桶
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/09/24/promise/" target="_self">
JavaScript 中存在很多异步操作,Promise 将异步操作队列化，按照期望的顺序执行，返回符合预期的结果。可以通过链式调用多个 Promise 达到我们的目的。
promise 创建时即立即执行即同步任务，即promise里面的会立刻执行，其实resolve也会立即执行，但是它给then才能看出结果，但是then 会放在异步微任务中执行，需要等同步任务执行后才执行。
1234567891
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-09-24 15:44" pubdate>
2021-09-24
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/09/24/lanFenlei/" target="_self">
编译型和解释型、动态语言和静态语言、强类型定义语言和弱类型定义语言区别
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/09/24/lanFenlei/" target="_self">
编译型和解释型、动态语言和静态语言、强类型定义语言和弱类型定义语言区别
编译型和解释型的区别 先来看看编译型语言定义：
编译型语言首先是将源代码编译生成机器指令，再由机器运行机器码(二进制)。
再来看看解释型语言的定义：
解释型语言的源代码不是直接翻译成机器指令，而是先翻译成中间代码，再由解释器对中间代码进行解释运行。
咋看一眼，还是一脸懵逼。下面打个比方：
* 编译型相当于用
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-09-24 15:42" pubdate>
2021-09-24
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/09/07/gitpost/" target="_self">
gitpost
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/09/07/gitpost/" target="_self">
首先你需要一个github账号，所有还没有的话先去注册吧！
https://github.com/
我们使用git需要先安装git工具，这里给出下载地址，下载后一路直接安装即可：
https://git-for-windows.github.io/
1.进入Github首页，点击New repository新建一个项目
2.填写相应信息后点击create即可
Repository name:
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-09-07 22:04" pubdate>
2021-09-07
</time>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/08/29/JSadvance04/" target="_self">
JS高级04_进程与线程、浏览器模块、定时器、时间循环机制
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/08/29/JSadvance04/" target="_self">
1. 线程与进程1). 进程:（即打开一个程序）
程序的一次执行, 它占有一片独有的内存空间可以通过windows任务管理器查看进程
2). 线程:（即比如 一个程序里有负责渲染的、网络的 等等线程）
是进程内的一个独立执行单元是程序执行的一个完整流程是CPU的最小调度单元
进程 > 线程
3). 关系一个进程中一般至少有一个运行的线程:主线程一个进程中也可以同时运行多个线程，我们会说程序是
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-08-29 20:21" pubdate>
2021-08-29
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/08/29/JSadvance03/" target="_self">
JS高级03_对象的创建、继承、GC
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/08/29/JSadvance03/" target="_self">
1. 对象的创建（设计）模式1). Object构造函数模式缺点：语句多，流程繁杂
var obj = {}
obj.name = 'Tom'
obj.setName = function(name){this.name=name}
2). 对象字面量模式 {}一下都定义了优点：书写简单，直观。
缺点：new多个实例对象的时候，重复代码多。
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-08-29 20:19" pubdate>
2021-08-29
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/08/29/JSadvance02/" target="_self">
JS高级02_原型、执行上下文、作用域、闭包
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/08/29/JSadvance02/" target="_self">
P20 P21没看 +22前11
1. 原型与原型链
函数的prototype属性(图)
每个函数都有一个prototype属性, 它默认指向一个Object空对象(即称为: 原型对象)
原型对象中有一个属性constructor, 它指向函数对象
1234567891011121314function Person( ) {}//1．每一个函数都有一个属性prototy
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-08-29 20:10" pubdate>
2021-08-29
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/08/29/JSadvance01/" target="_self">
JS高级01_类型、对象、函数、Git基本操作
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/08/29/JSadvance01/" target="_self">
1. 数据类型的分类和判断1). 基本(值)类型Number ----- 任意数值 -------- typeof
String ----- 任意字符串 ------ typeof
Boolean ---- true/false ----- typeof
undefined --- undefined ----- typeof/===
null -------- null ---------- =
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-08-29 20:09" pubdate>
2021-08-29
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/JavaScript/">JavaScript</a>
</div>
</div>
</article>
</div>
<div class="row mx-auto index-card">
<article class="col-12 col-md-12 mx-auto index-info">
<h1 class="index-header">
<a href="/2021/08/29/Java-function/" target="_self">
Java各类的常用方法总结
</a>
</h1>
<p class="index-excerpt">
<a href="/2021/08/29/Java-function/" target="_self">
1.Collection接口（List、Set）https://www.matools.com/api/java8
常用类：
ArrayList ，HashSet ， LinkedList ， PriorityQueue， Stack ， TreeSet ， Vector
修饰符和类型
方法及描述
boolean
add(E e)确保此集合包含指定的元素（可选操作）。
boole
</a>
</p>
<div class="index-btm post-metas">
<div class="post-meta mr-3">
<i class="iconfont icon-date"></i>
<time datetime="2021-08-29 13:45" pubdate>
2021-08-29
</time>
</div>
<div class="post-meta mr-3">
<i class="iconfont icon-category"></i>
<a href="/categories/Java/">Java</a>
</div>
</div>
</article>
</div>
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map reduce的使用
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1.map() 方法：原数组中的每个元素调用一个指定方法后，返回返回值组成的新数组。
1arr.map(function)
例子：有一个数组x=[1, 2, 3, 4, 5, 6, 7, 8, 9],求x^2
12345678function pow(x){ //定义一个平方函数 return x*x;}var arr=[1,2,3,4,5,6,7,8,9];var
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2021-08-24
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<a href="/categories/JavaScript/">JavaScript</a>
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