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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="theme-color" content="#0078E7"><meta name="author" content="忘忧"><meta name="copyright" content="忘忧"><meta name="generator" content="Hexo 5.4.0"><meta name="theme" content="hexo-theme-yun"><title>忘忧的小站</title><link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@900&display=swap" media="print" onload="this.media='all'"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/yun/yun-markdown.min.css"><script src="//at.alicdn.com/t/font_1140697_dxory92pb0h.js" async></script><script src="https://cdn.jsdelivr.net/npm/scrollreveal/dist/scrollreveal.min.js" defer></script><script>function initScrollReveal() {
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});</script><section class="flex flex-col" id="recent-posts"><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2022/07/16/session/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2022/07/16/session/">Session</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2022-07-16 16:30:00" itemprop="dateCreated datePublished" datetime="2022-07-16T16:30:00+08:00">2022-07-16</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">635</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">2m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><p><span style="color:red">session默认有效期是30分钟</span></p></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/%E5%90%8E%E7%AB%AF/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">后端</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/Session/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">Session</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2022/01/22/Oracle/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2022/01/22/Oracle/">Oracle的一些语法</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2022-01-22 16:00:00" itemprop="dateCreated datePublished" datetime="2022-01-22T16:00:00+08:00">2022-01-22</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">544</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">2m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><h2 id="merge-into语法"><a href="#merge-into语法" class="headerlink" title="merge into语法"></a>merge into语法</h2><blockquote>
<p> <strong>作用:判断Ｂ表和Ａ表是否满足ON中条件，如果满足则用B表去更新A表，如果不满足，则将B表数据插入A表</strong></p>
</blockquote>
<pre class="language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">MERGE</span> <span class="token keyword">INTO</span> <span class="token punctuation">[</span>target<span class="token operator">-</span><span class="token keyword">table</span><span class="token punctuation">]</span> A <span class="token keyword">USING</span> <span class="token punctuation">[</span>source<span class="token operator">-</span><span class="token keyword">table</span> <span class="token keyword">sql</span><span class="token punctuation">]</span> B <span class="token keyword">ON</span><span class="token punctuation">(</span><span class="token punctuation">[</span>conditional expression<span class="token punctuation">]</span> <span class="token operator">and</span> <span class="token punctuation">[</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">)</span>
<span class="token keyword">WHEN</span> <span class="token keyword">MATCHED</span> <span class="token keyword">THEN</span>
<span class="token punctuation">[</span><span class="token keyword">UPDATE</span> <span class="token keyword">sql</span><span class="token punctuation">]</span>
<span class="token keyword">WHEN</span> <span class="token operator">NOT</span> <span class="token keyword">MATCHED</span> <span class="token keyword">THEN</span>
<span class="token punctuation">[</span><span class="token keyword">INSERT</span> <span class="token keyword">sql</span><span class="token punctuation">]</span></code></pre>
<p>例：</p>
<pre class="language-sql" data-language="sql"><code class="language-sql"><span class="token keyword">merge</span> <span class="token keyword">into</span> TABLEA a <span class="token keyword">using</span> <span class="token punctuation">(</span><span class="token keyword">select</span> <span class="token string">'{0}'</span> <span class="token keyword">as</span> age<span class="token punctuation">,</span><span class="token string">'{1}'</span> <span class="token keyword">as</span> name<span class="token punctuation">,</span><span class="token string">'{2}'</span> <span class="token keyword">as</span> sex <span class="token keyword">from</span> dual<span class="token punctuation">)</span> b
<span class="token keyword">on</span> <span class="token punctuation">(</span>a<span class="token punctuation">.</span>age<span class="token operator">=</span>b<span class="token punctuation">.</span>age<span class="token punctuation">)</span> <span class="token keyword">when</span> <span class="token keyword">matched</span> <span class="token keyword">then</span>
<span class="token keyword">update</span> <span class="token keyword">set</span> a<span class="token punctuation">.</span>name<span class="token operator">=</span>b<span class="token punctuation">.</span>name<span class="token punctuation">,</span>a<span class="token punctuation">.</span>sex<span class="token operator">=</span>b<span class="token punctuation">.</span>sex
<span class="token keyword">when</span> <span class="token operator">not</span> <span class="token keyword">matched</span> <span class="token keyword">then</span>
<span class="token keyword">insert</span><span class="token punctuation">(</span>age<span class="token punctuation">,</span>name<span class="token punctuation">,</span>sex<span class="token punctuation">)</span> <span class="token keyword">values</span><span class="token punctuation">(</span>b<span class="token punctuation">.</span>age<span class="token punctuation">,</span>b<span class="token punctuation">.</span>name<span class="token punctuation">,</span>b<span class="token punctuation">.</span>sex<span class="token punctuation">)</span></code></pre></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/Oracle/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">Oracle</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/SQL/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">SQL</span></a><a class="tag-item" href="/tags/%E8%A1%A8%E6%9F%A5%E8%AF%A2/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">表查询</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2022/01/22/something/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2022/01/22/something/">平时遇到的一些方法</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2022-01-22 14:10:00" itemprop="dateCreated datePublished" datetime="2022-01-22T14:10:00+08:00">2022-01-22</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">1.7k</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">8m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><h2 id="radio设置属性checked属性不生效"><a href="#radio设置属性checked属性不生效" class="headerlink" title="radio设置属性checked属性不生效"></a>radio设置属性checked属性不生效</h2><blockquote>
<p>jq中使用attr()函数来设置选择框的checked属性有时会不起作用<span style="color:red;">（设置不生效）</span></p>
<pre class="language-js" data-language="js"><code class="language-js"><span class="token function">$</span><span class="token punctuation">(</span><span class="token string">'#import'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">'checked'</span><span class="token punctuation">,</span><span class="token string">'checked'</span><span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
<p>这时可以用prop()函数来设置就可以了<span style="color:#1BD66C">（正常设置成功）</span></p>
<pre class="language-js" data-language="js"><code class="language-js"><span class="token function">$</span><span class="token punctuation">(</span><span class="token string">'#import'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">prop</span><span class="token punctuation">(</span><span class="token string">'checked'</span><span class="token punctuation">,</span><span class="token string">'checked'</span><span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
</blockquote>
<h3 id="attr-和prop-的区别"><a href="#attr-和prop-的区别" class="headerlink" title="attr()和prop()的区别"></a>attr()和prop()的区别</h3><p>attr()方法主要是用来处理自定义的DOM属性；</p>
<p>prop()方法主要是用来处理本身就带有的固有属性</p>
<p>使用： <strong>具有true和false属性的属性，就使用prop()，比如checked selected disabled等，其他的使用attr()</strong></p></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/JS/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">JS</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/js/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">js</span></a><a class="tag-item" href="/tags/%E5%B0%8F%E7%BB%93/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">小结</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2021/12/16/node/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2021/12/16/node/">node.js&MongoDB</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2021-12-16 08:10:00" itemprop="dateCreated datePublished" datetime="2021-12-16T08:10:00+08:00">2021-12-16</time><span class="post-meta-divider">-</span><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-2-line"></use></svg></span> <time title="修改时间：2021-12-20 18:16:22" itemprop="dateModified" datetime="2021-12-20T18:16:22+08:00">2021-12-20</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">6.4k</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">25m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><h2 id="NodeJS介绍和安装"><a href="#NodeJS介绍和安装" class="headerlink" title="NodeJS介绍和安装"></a>NodeJS介绍和安装</h2><h3 id="什么是Node-js"><a href="#什么是Node-js" class="headerlink" title="什么是Node.js"></a>什么是Node.js</h3><ul>
<li>Node.js 是一个基于 Chrome V8 引擎的 JavaScript 运行环境(采用Google开发的V8引擎运行js代码)</li>
<li>Node.js 使用了事件驱动、非阻塞式 I/O 的模型，使其轻量又高效</li>
<li><img src="https://img.wenhairu.com/images/2021/12/16/5Whiu.png" alt="image-20201208211110291"></li>
</ul>
<h3 id="Node-js使用场景"><a href="#Node-js使用场景" class="headerlink" title="Node.js使用场景"></a>Node.js使用场景</h3><ul>
<li>高并发</li>
<li>即时通讯</li>
<li>推送消息</li>
</ul>
<h3 id="Node-js的特性"><a href="#Node-js的特性" class="headerlink" title="Node.js的特性"></a>Node.js的特性</h3><ul>
<li>它是一个JavaScript运行环境</li>
<li>依赖于Chrome V8引擎</li>
<li>轻量，适于实时数据交互应用</li>
<li>单线程</li>
<li>非阻塞I/O</li>
<li>事件驱动</li>
</ul></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">学习笔记</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/node/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">node</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2021/12/11/JS-time/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2021/12/11/JS-time/">关于JS和时间相关的函数</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2021-12-11 10:10:58" itemprop="dateCreated datePublished" datetime="2021-12-11T10:10:58+08:00">2021-12-11</time><span class="post-meta-divider">-</span><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-2-line"></use></svg></span> <time title="修改时间：2022-01-22 15:28:33" itemprop="dateModified" datetime="2022-01-22T15:28:33+08:00">2022-01-22</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">1.4k</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">7m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><h2 id="获取当前时间"><a href="#获取当前时间" class="headerlink" title="获取当前时间"></a>获取当前时间</h2><blockquote>
<p>得到当前时间的 YYYY-MM-DD HH:MI:ss 格式</p>
</blockquote>
<pre class="language-js" data-language="js"><code class="language-js"><span class="token keyword">function</span> <span class="token function">nowtime</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token keyword">var</span> _this <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> yy <span class="token operator">=</span> _this<span class="token punctuation">.</span><span class="token function">getFullYear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> mm <span class="token operator">=</span> _this<span class="token punctuation">.</span><span class="token function">getMonth</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">+</span><span class="token number">1</span><span class="token operator"><</span><span class="token number">10</span><span class="token operator">?</span><span class="token string">'0'</span><span class="token operator">+</span><span class="token punctuation">(</span>_this<span class="token punctuation">.</span><span class="token function">getMonth</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">+</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token operator">:</span><span class="token punctuation">(</span>_this<span class="token punctuation">.</span><span class="token function">getMonth</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">+</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> dd <span class="token operator">=</span> _this<span class="token punctuation">.</span><span class="token function">getDate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator"><</span><span class="token number">10</span><span class="token operator">?</span><span class="token string">'0'</span><span class="token operator">+</span>_this<span class="token punctuation">.</span><span class="token function">getDate</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> _this<span class="token punctuation">.</span><span class="token function">getDate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> hh <span class="token operator">=</span> _this<span class="token punctuation">.</span><span class="token function">getHours</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator"><</span> <span class="token number">10</span> <span class="token operator">?</span> <span class="token string">'0'</span> <span class="token operator">+</span> _this<span class="token punctuation">.</span><span class="token function">getHours</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> _this<span class="token punctuation">.</span><span class="token function">getHours</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> mf <span class="token operator">=</span> _this<span class="token punctuation">.</span><span class="token function">getMinutes</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator"><</span> <span class="token number">10</span> <span class="token operator">?</span> <span class="token string">'0'</span> <span class="token operator">+</span> _this<span class="token punctuation">.</span><span class="token function">getMinutes</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> _this<span class="token punctuation">.</span><span class="token function">getMinutes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> ss <span class="token operator">=</span> _this<span class="token punctuation">.</span><span class="token function">getSeconds</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator"><</span> <span class="token number">10</span> <span class="token operator">?</span> <span class="token string">'0'</span> <span class="token operator">+</span> _this<span class="token punctuation">.</span><span class="token function">getSeconds</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> _this<span class="token punctuation">.</span><span class="token function">getSeconds</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> nowtime <span class="token operator">=</span> yy <span class="token operator">+</span> <span class="token string">'-'</span> <span class="token operator">+</span> mm <span class="token operator">+</span> <span class="token string">'-'</span> <span class="token operator">+</span> dd <span class="token operator">+</span> <span class="token string">' '</span> <span class="token operator">+</span> hh <span class="token operator">+</span> <span class="token string">':'</span> <span class="token operator">+</span> mf <span class="token operator">+</span> <span class="token string">':'</span> <span class="token operator">+</span> ss<span class="token punctuation">;</span>
<span class="token keyword">return</span> nowtime<span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/JS/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">JS</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/%E5%87%BD%E6%95%B8/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">函數</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2021/12/07/usemd/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2021/12/07/usemd/">Markdown语法</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2021-12-07 18:10:58" itemprop="dateCreated datePublished" datetime="2021-12-07T18:10:58+08:00">2021-12-07</time><span class="post-meta-divider">-</span><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-2-line"></use></svg></span> <time title="修改时间：2021-12-30 19:40:28" itemprop="dateModified" datetime="2021-12-30T19:40:28+08:00">2021-12-30</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">1k</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">4m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><div class="info">
<blockquote>
<p>Markdown是一种轻量级标记语言，允许使用易读易写的纯文本格式编写文档，然后转换成有效的XHTML（或者HTML）文档</p>
</blockquote>
</div>
<pre><code>因为Markdown轻量高效，语法简单，因此写博客用此就很方便，下面介绍一些markdown的常用语法。
</code></pre></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/%E6%95%99%E7%A8%8B/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">教程</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/markdown/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">markdown</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2021/12/04/grep/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2021/12/04/grep/">正则</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2021-12-04 10:10:58" itemprop="dateCreated datePublished" datetime="2021-12-04T10:10:58+08:00">2021-12-04</time><span class="post-meta-divider">-</span><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-2-line"></use></svg></span> <time title="修改时间：2022-01-22 16:31:39" itemprop="dateModified" datetime="2022-01-22T16:31:39+08:00">2022-01-22</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">852</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">3m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><img src="https://img.wenhairu.com/images/2021/12/01/1xlgS.jpg" width="100%">
<p>正则表达式是一个描述字符模式的对象。也就是把规则说给计算机听。javascript中的RegExp类表示正则表达式。</p>
<p>可以使用RegExp()构造函数来创建RegExp对象，也可以通过直接量与法来创建。</p></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/JS/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">JS</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/%E6%AD%A3%E5%88%99/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">正则</span></a><a class="tag-item" href="/tags/js/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">js</span></a></div></div></article><article class="post-card w-full" itemscope itemtype="https://schema.org/Article"><link itemprop="mainEntityOfPage" href="https://wangyou.ink/2021/11/30/ES6/"><span hidden itemprop="author" itemscope itemtype="https://schema.org/Person"><meta itemprop="name" content="忘忧"><meta itemprop="description"></span><span hidden itemprop="publisher" itemscope itemtype="https://schema.org/Organization"><meta itemprop="name" content="忘忧的小站"></span><div class="post-card-header"><header class="post-header"><h2 class="post-title" itemprop="name headline"><a class="post-title-link" itemprop="url" href="/2021/11/30/ES6/">ES6</a></h2><div class="post-meta"><div class="post-time" style="display:block"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-line"></use></svg></span> <time title="创建时间：2021-11-30 18:10:58" itemprop="dateCreated datePublished" datetime="2021-11-30T18:10:58+08:00">2021-11-30</time><span class="post-meta-divider">-</span><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-calendar-2-line"></use></svg></span> <time title="修改时间：2021-12-18 17:39:49" itemprop="dateModified" datetime="2021-12-18T17:39:49+08:00">2021-12-18</time></div><span class="post-count"><span class="post-symbolcount"><span class="post-meta-item-icon" title="本文字数"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-file-word-line"></use></svg></span> <span title="本文字数">18.9k</span><span class="post-meta-divider">-</span><span class="post-meta-item-icon" title="阅读时长"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-timer-line"></use></svg></span> <span title="阅读时长">76m</span></span></span></div></header></div><div class="post-card-content text-center"><div class="post-card-excerpt markdown-body"><h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>ECMAScript 6.0（以下简称 ES6）是 JavaScript 语言的下一代标准，已经在 2015 （ES2015）年 6 月正式发布了。它的目标，是使得 JavaScript 语言可以用来编写复杂的大型应用程序，成为企业级开发语言。</p></div></div><div class="hty-card__actions post-card__actions"><div class="post-card-category"> <span class="post-meta-item-icon" style="margin-right:3px;"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-folder-line"></use></svg></span><span itemprop="about" itemscope itemtype="https://schema.org/Thing"><a class="category-item" href="/categories/JS/" style="--text-color:var(--hty-text-color)" itemprop="url" rel="index"><span itemprop="text">JS</span></a></span></div><div class="post-card-tag"><a class="tag-item" href="/tags/es6/" style="--text-color:var(--hty-text-color)"><span class="post-meta-item-icon"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-price-tag-3-line"></use></svg></span><span class="tag-name">es6</span></a></div></div></article></section></main><footer class="sidebar-translate" id="footer"><div class="beian"><a rel="noopener" href="https://beian.miit.gov.cn/" target="_blank">豫ICP备2021038004号</a></div><div class="copyright"><span>© 2021 – 2022 </span><span class="with-love" id="animate"><svg class="icon" aria-hidden="true"><use xlink:href="#icon-cloud-line"></use></svg></span><span class="author"> 忘忧</span></div><div class="powered"><span>由 <a href="https://hexo.io" target="_blank" rel="noopener">Hexo</a> 驱动 v5.4.0</span><span class="footer-separator">|</span><span>主题 - 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