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<h4 id="数据库"><a href="#数据库" class="headerlink" title="数据库"></a>数据库</h4><ul>
<li>使用mysql模块操作MySQL数据库 npm i mysql</li>
<li>使用docker run -itd –name mysql-test -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql在docker中创建mysql容器</li>
<li>使用navicat连接数据库(localhost root 123456 3306(尽量用3306端口))<ul>
<li>出错1：ER_ACCESS_DENIED_ERROR: Access denied for user ‘root‘@’172.17.0.1’ (using password: YES) <figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">mysql<span class="operator">></span> <span class="keyword">CREATE</span> <span class="keyword">USER</span> <span class="string">'root'</span>@<span class="string">'172.17.0.1'</span> IDENTIFIED <span class="keyword">BY</span> <span class="string">'password'</span>;</span><br><span class="line">mysql<span class="operator">></span> <span class="keyword">GRANT</span> <span class="keyword">ALL</span> PRIVILEGES <span class="keyword">ON</span> <span class="operator">*</span>.<span class="operator">*</span> <span class="keyword">TO</span> <span class="string">'root'</span>@<span class="string">'172.17.0.1'</span> <span class="keyword">WITH</span> <span class="keyword">GRANT</span> OPTION;</span><br><span class="line">mysql<span class="operator">></span> flush privileges; </span><br><span class="line">mysql<span class="operator">></span> exit</span><br><span class="line">参考：https:<span class="operator">/</span><span class="operator">/</span>medium.com<span class="operator">/</span>tech<span class="operator">-</span>learn<span class="operator">-</span>share<span class="operator">/</span>docker<span class="operator">-</span>mysql<span class="operator">-</span>access<span class="operator">-</span>denied<span class="operator">-</span><span class="keyword">for</span><span class="operator">-</span><span class="keyword">user</span><span class="number">-172</span><span class="number">-17</span><span class="number">-0</span><span class="number">-1</span><span class="operator">-</span><span class="keyword">using</span><span class="operator">-</span>password<span class="operator">-</span>yes<span class="operator">-</span>c5eadad582d3</span><br></pre></td></tr></table></figure></li>
<li>出错2：ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">ALTER</span> <span class="keyword">USER</span> <span class="string">'root'</span>@<span class="string">'localhost'</span> IDENTIFIED <span class="keyword">WITH</span> mysql_native_password <span class="keyword">BY</span> <span class="string">'password'</span>;</span><br><span class="line">flush privileges;</span><br><span class="line">参考：https:<span class="operator">/</span><span class="operator">/</span>stackoverflow.com<span class="operator">/</span>questions<span class="operator">/</span><span class="number">50093144</span><span class="operator">/</span>mysql<span class="number">-8</span><span class="number">-0</span><span class="operator">-</span>client<span class="operator">-</span>does<span class="operator">-</span><span class="keyword">not</span><span class="operator">-</span>support<span class="operator">-</span>authentication<span class="operator">-</span>protocol<span class="operator">-</span>requested<span class="operator">-</span><span class="keyword">by</span><span class="operator">-</span>server</span><br></pre></td></tr></table></figure></li>
</ul>
</li>
<li>使用delete语句会把真正的数据从表中删除，为了保险起见，推荐使用标记删除的形式，设置status状态字段，标记该数据是否被删除(1表示删除)–>转化为update</li>
</ul>
<h4 id="两种web开发模式"><a href="#两种web开发模式" class="headerlink" title="两种web开发模式"></a>两种web开发模式</h4><ul>
<li>服务端渲染：服务器发送给客户端html页面，是服务器通过字符串的拼接动态生成的，因此客户端不需要使用Ajax这样的技术额外请求页面的数据</li>
<li>前后端分离：依赖于Ajax技术的广泛使用，后端只负责提供API接口，前端使用Ajax调用接口</li>
<li>如何选择？<ul>
<li>企业级网站：主要功能是展示而没有复杂交互，需要良好的SEO，使用服务端渲染</li>
<li>后台管理：交互性比较强，不需要考虑SEO，前后端分离 (可以利用vue，react提供的SSR技术解决SEO问题) </li>
<li>有时候为了同时兼顾首页的加载速度和前后端分离的开发效率，采用首屏服务端渲染+其他页面前后端分离开发模式<h4 id="身份认证"><a href="#身份认证" class="headerlink" title="身份认证"></a>身份认证</h4></li>
</ul>
</li>
<li>服务端推荐采用Session认证机制 前后端分离推荐使用JWT认证机制<h4 id="Cookie"><a href="#Cookie" class="headerlink" title="Cookie"></a>Cookie</h4></li>
<li>存储在用户浏览器中一段不超过4KB的字符串，不同域名下的Cookie各自独立，每当客户端发送请求时，会<strong>自动</strong>把当前域名下所有<strong>未过期</strong>的Cookie一同发送到服务器 (自动发送 域名独立 过期时限 4KB限制)</li>
<li>客户端第一次请求服务器的时候，服务器通过响应头的形式向客户端发送一个身份认证的Cookie，客户端会自动保存到浏览器中；随后当客户端浏览器每次请求服务器时，浏览器自动将身份认证相关的Cookie通过请求头的形式发送给服务器，服务器即可验证客户端身份</li>
<li>Cookie不具有安全性(用户可以伪造Cookie)<h4 id="Session"><a href="#Session" class="headerlink" title="Session"></a>Session</h4></li>
</ul>
<h4 id="Token"><a href="#Token" class="headerlink" title="Token"></a>Token</h4><h4 id="中间件"><a href="#中间件" class="headerlink" title="中间件"></a>中间件</h4><p>本质上是一个function处理函数，形参列表中必须包含next参数，next函数是实现多个中间件连续调用的关键，把流转关系转交给下一个中间件或路由(路由是最终处理环节)</p>
<ul>
<li>作用：多个中间件之间，共享同一份req和res，因此可以在上游中间件中统一为req和res对象添加自定义的属性或方法，供下游的中间件或路由进行使用</li>
<li>全局生效中间件：客户端发送的任何请求到达服务器后都会触发的中间件；<ul>
<li>方式：调用app.use(中间件函数)</li>
</ul>
</li>
<li>定义多个全局中间价：使用app.use()连续定义多个全局中间件，客户端请求到达服务器之后，会按照中间件定义的先后顺序依次调用<br>docker+express搭建后端并发布</li>
<li>局部生效中间件：不使用app.use()<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> mw1 = <span class="keyword">function</span>(<span class="params">req,res,next</span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"这是中间件函数"</span>)</span><br><span class="line"> <span class="title function_">next</span>()</span><br><span class="line">}</span><br><span class="line">app.<span class="title function_">get</span>(<span class="string">'/'</span>,[mw1,mw2],<span class="keyword">function</span>(<span class="params">req,res</span>){</span><br><span class="line"> res.<span class="title function_">send</span>(<span class="string">'Home page'</span>)</span><br><span class="line">})<span class="comment">//mw只会影响当前路由</span></span><br></pre></td></tr></table></figure></li>
<li>注意事项<ul>
<li>一定要在路由之前注册中间件</li>
</ul>
</li>
<li>分类<ul>
<li>应用级别 绑定到app上</li>
<li>路由级别 绑定到router上</li>
<li>错误级别 必须4个形参(err,req,res,next) 必须注册在所有路由之后</li>
<li>Express内置 express.static .json .urlencoded</li>
<li>第三方</li>
</ul>
</li>
</ul>
<p>默认情况下，如果不配置解析表单数据的中间件，则req.body默认等于undefined</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">app.<span class="title function_">use</span>(express.<span class="title function_">json</span>())<span class="comment">//解析raw json格式数据 否则req.body undefined</span></span><br><span class="line">app.<span class="title function_">use</span>(express.<span class="title function_">urlencoded</span>({<span class="attr">extended</span>:<span class="literal">false</span>}))<span class="comment">//解析urlecoded格式数据，否则req.body为空对象</span></span><br></pre></td></tr></table></figure>
<ul>
<li>自定义中间件</li>
</ul>
<h4 id="npm与包"><a href="#npm与包" class="headerlink" title="npm与包"></a>npm与包</h4><ul>
<li>包的语义化版本规范：大版本 功能版本 Bug修复版本</li>
<li>npm uninsall 指定包名 开发依赖：-D/–save-dev(devDependencies/开发依赖包只用于开发，dependencies/核心依赖包开发和上线都能用到)</li>
</ul>
<p>references</p>
<p><a target="_blank" rel="noopener" href="http://escook.cn:8088/">http://escook.cn:8088/</a></p>
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<blockquote>
<p>http协议是TCP协议的典型应用，是浏览器与服务器交流的主要方式，服务器会监听80端口，等待客户端连接</p>
</blockquote>
<p>本blog在创建socket客户端和服务端的基础上，采用python socket和多线程构造一个简易的tinyHTTP,可以通过多线程并发支持多客户端请求，同时对客户端进行响应</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 由socket服务端改造为httpServer，</span></span><br><span class="line"><span class="keyword">import</span> socket</span><br><span class="line"><span class="keyword">import</span> threading</span><br><span class="line"><span class="keyword">import</span> os</span><br><span class="line"></span><br><span class="line"><span class="comment">#处理http客户端请求</span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">handle_http_client</span>(<span class="params">c, addr</span>):</span><br><span class="line"> <span class="built_in">print</span>(addr, <span class="string">"connected."</span>)</span><br><span class="line"> WEBROOT = os.path.dirname(__file__)</span><br><span class="line"> <span class="built_in">print</span>(<span class="string">"WEBROOT"</span>,WEBROOT)</span><br><span class="line"> <span class="keyword">with</span> c:</span><br><span class="line"> request = c.recv(<span class="number">1024</span>)</span><br><span class="line"></span><br><span class="line"> <span class="comment"># Parse HTTP headers</span></span><br><span class="line"> headers = request.split(<span class="string">b"\r\n"</span>)</span><br><span class="line"> <span class="built_in">print</span>(headers)</span><br><span class="line"> file = headers[<span class="number">0</span>].split()[<span class="number">1</span>].decode()</span><br><span class="line"> <span class="built_in">print</span>(<span class="string">"file"</span>,file)</span><br><span class="line"> <span class="comment"># Load file content</span></span><br><span class="line"> <span class="keyword">if</span> file == <span class="string">"/"</span>:</span><br><span class="line"> file = <span class="string">"index.html"</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">try</span>:</span><br><span class="line"> <span class="keyword">with</span> <span class="built_in">open</span>(WEBROOT + file, <span class="string">"rb"</span>) <span class="keyword">as</span> f:</span><br><span class="line"> content = f.read()</span><br><span class="line"> response = <span class="string">b"HTTP/1.0 200 OK\r\n\r\n"</span> + content</span><br><span class="line"> <span class="keyword">except</span> FileNotFoundError:</span><br><span class="line"> response = <span class="string">b"HTTP/1.0 404 NOT FOUND\r\n\r\nFile not found!"</span></span><br><span class="line"> <span class="comment"># Send HTTP response</span></span><br><span class="line"> c.sendall(response)</span><br><span class="line"></span><br><span class="line"><span class="comment">#处理socket客户端请求</span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">handle_client</span>(<span class="params">c,addr</span>):</span><br><span class="line"> <span class="built_in">print</span>(addr,<span class="string">"connected."</span>)</span><br><span class="line"> <span class="keyword">while</span> <span class="literal">True</span>:</span><br><span class="line"> data = c.recv(<span class="number">1024</span>)</span><br><span class="line"> <span class="keyword">if</span> <span class="keyword">not</span> data:</span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> c.sendall(data)</span><br><span class="line"></span><br><span class="line"><span class="keyword">with</span> socket.socket(socket.AF_INET,socket.SOCK_STREAM) <span class="keyword">as</span> s:</span><br><span class="line"> s.bind((<span class="string">"0.0.0.0"</span>,<span class="number">1234</span>))</span><br><span class="line"> s.listen()</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">while</span> <span class="literal">True</span>:</span><br><span class="line"> c, addr = s.accept()</span><br><span class="line"> t = threading.Thread(target=handle_http_client, args=(c,addr))</span><br><span class="line"> t.start()</span><br></pre></td></tr></table></figure>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># socket客户端 这里未实现http客户端(直接用浏览器代替)</span></span><br><span class="line"><span class="keyword">import</span> socket</span><br><span class="line"></span><br><span class="line"><span class="keyword">with</span> socket.socket(socket.AF_INET,socket.SOCK_STREAM) <span class="keyword">as</span> s:</span><br><span class="line"> s.connect((<span class="string">"127.0.0.1"</span>,<span class="number">1234</span>))</span><br><span class="line"> s.sendall(<span class="string">b"Hello,Xiaoming!"</span>)</span><br><span class="line"> data = s.recv(<span class="number">1024</span>)</span><br><span class="line"> <span class="built_in">print</span>(<span class="string">"Received:"</span>,<span class="built_in">repr</span>(data))</span><br></pre></td></tr></table></figure>
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<h2 id="异步编程"><a href="#异步编程" class="headerlink" title="异步编程"></a>异步编程</h2><ul>
<li>fs文件操作</li>
<li>数据库操作</li>
<li>AJAX</li>
<li>定时器<br>旧方案单纯回调函数形式处理</li>
</ul>
<h3 id="为什么要用Promise"><a href="#为什么要用Promise" class="headerlink" title="为什么要用Promise"></a>为什么要用Promise</h3><ul>
<li>支持链式调用，解决回调地狱问题</li>
<li>指定回调函数的方式更加灵活<ul>
<li>旧的：必须在启动异步任务前指定</li>
<li>promise: 启动异步任务 => 返回promise对象 => 给promise对象绑定回调函数(甚至可以在异步任务结束之后指定/多个)</li>
</ul>
</li>
</ul>
<p>针对跨域<br>http-proxy-middleware在客户端配置<br>cors在服务端配置</p>
<h3 id="Promise的状态"><a href="#Promise的状态" class="headerlink" title="Promise的状态"></a>Promise的状态</h3><p>实例对象中的一个属性 【PromiseState】</p>
<ul>
<li>pending 未决定的</li>
<li>resolved/fullfilled 成功</li>
<li>rejected 失败</li>
<li>Promise状态改变：只有两种，且一个promise对象只能改变一次</li>
</ul>
<h3 id="Promise对象的值"><a href="#Promise对象的值" class="headerlink" title="Promise对象的值"></a>Promise对象的值</h3><p>实例对象的另一个属性 【PromiseResult】<br>保存的是异步任务【成功/失败】的结果 </p>
<h3 id="API"><a href="#API" class="headerlink" title="API"></a>API</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">Promise.prototype.then((value)=>{},(reason)=>{})</span><br><span class="line">Promise.prototype.catch((reason)=>{})//是上面第二个函数对应的语法糖</span><br><span class="line">Promise.resolve();</span><br><span class="line">//如果传入的参数为非promise类型的对象，则返回结果为成功promise对象</span><br><span class="line">//如果传入参数是pr omise对象，则参数的结果决定了resolve的结果</span><br><span class="line">Promise.reject(reason);//返回一个失败的promise对象，值是传入的值(即使他是一个promise)</span><br><span class="line">Promise.all(promises) //参数:n个promise的数组 返回一个新的promise(只有所有的promise都成功才成功，只要一个失败则直接失败，成功结果是每个promise成功结果组成的一个数组，失败结果是数组中失败的那个promise对应的结果)</span><br><span class="line">Promise.race(promises) //参数:n个promise的数组 返回一个新的promise(第一个完成的promise的结果状态就是最终的结果状态)</span><br></pre></td></tr></table></figure>
<h3 id="几个关键问题"><a href="#几个关键问题" class="headerlink" title="几个关键问题"></a>几个关键问题</h3><ol>
<li>如何改变promise的状态</li>
</ol>
<ul>
<li>resolve(value)</li>
<li>reject(reason)</li>
<li>throw Error抛出异常</li>
</ul>
<ol start="2">
<li>一个promise指定多个成功/失败回调函数，则都会调用<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">const p = new Promise((resolve,rejected)=>{</span><br><span class="line"> resolve('ok')</span><br><span class="line">})</span><br><span class="line">p.then(value=>console.log(value))</span><br><span class="line">p.then(value=>alert(value))</span><br></pre></td></tr></table></figure></li>
<li>改变promise状态和指定回调函数谁先谁后?</li>
<li>promise.then()返回的新promise的结果状态由什么决定？</li>
</ol>
<p>—由then()指定的回调函数执行的结果决定<br>5. promise如何串联多个操作任务<br>—通过then的链式调用串联多个同步/异步任务<br>6. promise异常穿透<br>7. 中断promise链<br>方法：在回调函数中返回一个pending状态的promise对象(状态没有改变，后续.then方法都不能执行)</p>
<h2 id="手写Promise"><a href="#手写Promise" class="headerlink" title="手写Promise"></a>手写Promise</h2><h2 id="async与await"><a href="#async与await" class="headerlink" title="async与await"></a>async与await</h2><ul>
<li>async函数的返回值为promise对象，对象结果由async函数执行的返回值决定(和.then()的返回结果相同)</li>
<li>await右侧的表达式如果是promise对象，则await返回的是promise成功的值，如果表达式是其他值，直接将此值作为await的返回值</li>
<li>await必须写在async函数中，但async函数可以没有await;如果await的promise失败了，就会抛出异常，需要通过try…catch捕获处理</li>
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<a href="/2023/03/09/immutable/" class="post-title-link" itemprop="url">immutable</a>
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<h3 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h3><p>react中要求老状态是不可变对象，保证老状态随时可做diff对比去用，如果把老状态直接改了，那diff老状态和新状态就没有区别了</p>
<h3 id="引入Immutable"><a href="#引入Immutable" class="headerlink" title="引入Immutable"></a>引入Immutable</h3><p>实现原理：持久化数据结构，使用旧数据创建新数据时，要保证旧数据同时可用且不变。同时为了避免deepCopy把所有节点都复制一遍所带来的性能损耗，Immutable使用了结构共享，即如果对象树中一个节点发生变化，只修改这个节点和受他影响的父节点，其他节点则进行共享。</p>
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<p>着色不考虑其他物体的存在，只考虑自己，因此没有阴影(局部性)</p>
<p>凹凸贴图和位移贴图</p>
<h4 id="Blin-Phong模型"><a href="#Blin-Phong模型" class="headerlink" title="Blin-Phong模型"></a>Blin-Phong模型</h4><p>很经验的模型但是有一定的物理道理<br>所有向量均为单位向量，因为只需要夹角参数<br>Blinn-Phong对Phong的改进：使用半程向量h=bisector(v,1)和n的夹角代替R和v的夹角(反射方向计算量比较大，而半程向量很好算)<br>高光$k_d$可以定义为白色<br>环境光和l,v,n均无关，其实是一个常数，就是某一种特定的颜色(实际上不是这回事，精确计算需要全局光照的知识)(其实一个点凹下去的话环境光应该暗一些，而不是和其他点都一样)</p>
<h4 id="shading-frequency"><a href="#shading-frequency" class="headerlink" title="shading frequency"></a>shading frequency</h4><ul>
<li>falt shading 逐三角形</li>
<li>Gouraud shading 逐顶点</li>
<li>Phong 逐像素</li>
</ul>
<p>给定顶点法向(平均或者加权平均(和三角形面积加权)),如何插值中间的法线呢<br>*重心坐标</p>
<p>图形管线(实时渲染管线)<br>从三位场景到最后渲染出一副二维的图的一个基本操作，集成在显卡中<br>其中顶点和像素如何着色是可编程的(顶点着色还是像素着色，以及如何着色 )</p>
<p>shader programs</p>
<h4 id="纹理映射"><a href="#纹理映射" class="headerlink" title="纹理映射"></a>纹理映射</h4><p>三角形的每个点对应木头纹理上面的每个点<br>定义任何一个点的属性<br>三维物体表面其实是二维的，因此可以和一张图有一一对应关系<br>物体表面一点和纹理上一点的对应关系<br>怎么把空间上的一个三角形映射到纹理上，我们不管，我们就认为已经有了这么一个映射关系，三角形上的任何一个顶点已经规定好了它在纹理上的坐标<br>需要纹理上的坐标，因此需要定义纹理上的坐标系，这个坐标系用uv来表示，都认为u在[0,1]，v也在[0,1]，方便处理，不管分辨率和长宽比<br>三角形每个顶点都对应一个uv,这就是纹理映射，怎么知道的，假设已经知道了<br>一个场景可能需要很多个纹理，像贴瓷砖一样，这就涉及到纹理之间的裂缝问题<br>纹理的无缝衔接的合成</p>
<p>知道了三角形三个顶点对应的纹理坐标uv，如何知道三角形内部三个顶点对应的纹理坐标uv</p>
<p>纹理定义着色时候需要的各个不同点的属性，我不希望着色的时候每个顶点以一种相同的方式来着色，然后用纹理的方式改变一些逐点的属性</p>
<p>如何定义不同的材质或者表面，与光线如何作用，我们就会得到一种怎样的看上去的外观，光线与材质如何作用？</p>
<p>Mipmap只能做近似的正方形的范围查询</p>
<h4 id="利用重心坐标进行插值"><a href="#利用重心坐标进行插值" class="headerlink" title="利用重心坐标进行插值"></a>利用重心坐标进行插值</h4><p>重心坐标在投影操作下会发生变化，因此三维空间的属性建议在三维空间中做插值，然后再将值对应在二维结果上</p>
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<a href="/2022/12/05/%E5%93%8D%E5%BA%94%E5%BC%8F%E5%B8%83%E5%B1%80/" class="post-title-link" itemprop="url">响应式布局</a>
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<p>响应式布局是同一页面在不同的屏幕上有不同的布局，即只需要一套代码使页面适应不同的屏幕</p>
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<p>Three.js是基于原生WebGL(Javascript的3D图形接口，把JavaScript和OpenGL ES 2.0结合在一起。)封装运行的三维引擎<br>三要素是：场景(Scene)、相机(Camera)、渲染器(Renderer),下面通过三要素在浏览器中创建几何体并显示</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> <span class="variable constant_">THREE</span> <span class="keyword">from</span> <span class="string">"three"</span></span><br><span class="line"><span class="comment">// three.js最基本的创建流程</span></span><br><span class="line"><span class="keyword">const</span> scene = <span class="keyword">new</span> <span class="variable constant_">THREE</span>.<span class="title class_">Scene</span>();</span><br><span class="line"><span class="keyword">const</span> camera = <span class="keyword">new</span> <span class="variable constant_">THREE</span>.<span class="title class_">PerspectiveCamera</span>(<span class="number">75</span>, <span class="variable language_">window</span>.<span class="property">innerWidth</span> / <span class="variable language_">window</span>.<span class="property">innerHeight</span>, <span class="number">0.1</span>, <span class="number">1000</span>)</span><br><span class="line">camera.<span class="property">position</span>.<span class="title function_">set</span>(<span class="number">0</span>,<span class="number">0</span>,<span class="number">10</span>)</span><br><span class="line">scene.<span class="title function_">add</span>(camera)</span><br><span class="line"><span class="keyword">const</span> cubeGeometry = <span class="keyword">new</span> <span class="variable constant_">THREE</span>.<span class="title class_">BoxGeometry</span>()</span><br><span class="line"><span class="keyword">const</span> cubeMaterial = <span class="keyword">new</span> <span class="variable constant_">THREE</span>.<span class="title class_">MeshBasicMaterial</span>({ <span class="attr">color</span>: <span class="number">0xffff00</span> })</span><br><span class="line"><span class="comment">//根据几何体和材质创建物体</span></span><br><span class="line"><span class="keyword">const</span> cube = <span class="keyword">new</span> <span class="variable constant_">THREE</span>.<span class="title class_">Mesh</span>(cubeGeometry,cubeMaterial)</span><br><span class="line"><span class="comment">//将几何体添加到场景中</span></span><br><span class="line">scene.<span class="title function_">add</span>(cube)</span><br><span class="line"><span class="comment">//初始化渲染器</span></span><br><span class="line"><span class="keyword">const</span> renderer = <span class="keyword">new</span> <span class="variable constant_">THREE</span>.<span class="title class_">WebGLRenderer</span>()</span><br><span class="line"><span class="comment">//设置渲染的尺寸大小</span></span><br><span class="line">renderer.<span class="title function_">setSize</span>(<span class="variable language_">window</span>.<span class="property">innerWidth</span>, <span class="variable language_">window</span>.<span class="property">innerHeight</span>)</span><br><span class="line"><span class="comment">//将webgl渲染的canvas内容添加到body</span></span><br><span class="line"><span class="variable language_">document</span>.<span class="property">body</span>.<span class="title function_">appendChild</span>(renderer.<span class="property">domElement</span>)</span><br><span class="line"><span class="comment">//使用渲染器，通过相机将场景渲染进来</span></span><br><span class="line">renderer.<span class="title function_">render</span>(scene,camera)</span><br></pre></td></tr></table></figure>
<p>threejs开源项目目录结构<br><img src="/2022/12/05/Threejs/threejs.png"></p>
<p>…后续补坑</p>
<p>References<br><a target="_blank" rel="noopener" href="https://juejin.cn/post/7020396322062598181">https://juejin.cn/post/7020396322062598181</a></p>
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<p><img src="/2022/12/01/Git%E5%B7%A5%E4%BD%9C%E6%B5%81/git_flow.png"></p>
<h3 id="git基本命令"><a href="#git基本命令" class="headerlink" title="git基本命令"></a><strong>git基本命令</strong></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">* git config --global user.name ""</span><br><span class="line">* git config --global user.email ...</span><br><span class="line">* git status查看当前工作流状态</span><br><span class="line">* git log查看提交信息</span><br><span class="line">* git commit -a -m commit_name(-a执行git add) 直接从工作区跳到本地版本库</span><br><span class="line">为当前仓库新增文件，但是该文件还不能确定是否需要，可以在主分支中创建新分支</span><br><span class="line">* git branch branch_name 创建分支</span><br><span class="line">* git checkout branch_name 切换分支</span><br><span class="line">* git checkout -b 创建并切换分支</span><br><span class="line">* git branch -d branch_name 删除分支(不会立即删除，因为没有合并分支，非常确定要删除的时候可以使用 -D)</span><br><span class="line">* git merge branch_name(将分支合并到主分支)</span><br><span class="line">* git remote -v 查看本地仓库和哪些远程仓库有联系(默认用origin表示远程仓库的名字)</span><br><span class="line">* 使用github destop push速度更快</span><br></pre></td></tr></table></figure>
<h3 id="Github"><a href="#Github" class="headerlink" title="Github"></a><strong>Github</strong></h3><ul>
<li>PR 是一种通知机制。你修改了他人的代码，将你的修改通知原来的作者，希望他合并你的修改，这就是 Pull Request</li>
<li>actions 将持续集成过程变成了一个 actions 的组合</li>
</ul>
<h3 id="GitLab"><a href="#GitLab" class="headerlink" title="GitLab"></a><strong>GitLab</strong></h3><ul>
<li>GitLab有完善的管理界面和权限控制，一般用于在企业、学校等内部网络搭建Git私服。</li>
<li>从代码的私有性上来看，GitLab 是一个更好的选择。但是对于开源项目而言，GitHub 依然是代码托管的首选。</li>
</ul>
<h3 id="GitBook"><a href="#GitBook" class="headerlink" title="GitBook"></a><strong>GitBook</strong></h3><p>(GitBook) 是一个使用 Git 和 Markdown 来构建书籍的工具。它可以将你的书输出很多格式：PDF，ePub，mobi，或者输出为静态网页。</p>
<h3 id="References"><a href="#References" class="headerlink" title="References"></a>References</h3><p><a target="_blank" rel="noopener" href="https://www.ruanyifeng.com/blog/2019/09/getting-started-with-github-actions.html">https://www.ruanyifeng.com/blog/2019/09/getting-started-with-github-actions.html</a><br><a target="_blank" rel="noopener" href="https://learngitbranching.js.org/">https://learngitbranching.js.org/</a></p>
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<a href="/2022/12/01/es6/" class="post-title-link" itemprop="url">ES6新语法</a>
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<span class="post-meta-item-text">Posted on</span>
<time title="Created: 2022-12-01 15:30:20" itemprop="dateCreated datePublished" datetime="2022-12-01T15:30:20+08:00">2022-12-01</time>
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<span class="post-meta-item-text">Edited on</span>
<time title="Modified: 2022-12-04 23:05:29" itemprop="dateModified" datetime="2022-12-04T23:05:29+08:00">2022-12-04</time>
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<span class="post-meta-item-text">Symbols count in article: </span>
<span>1.1k</span>
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<span class="post-meta-item-text">Reading time ≈</span>
<span>1 mins.</span>
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<p>相关名词介绍</p>
<ul>
<li>ECMA 欧洲计算机制造商协会 制定标准的组织</li>
<li>ECMA-262是其中(标准)的一个,即ECMAscript</li>
<li>ES6版本变动内容最多，具有里程碑意义，加入很多新语法特性，编程更加简单高效</li>
<li>ECMA-262只是纸面标准，实践当中需要每个浏览器厂商对标准进行实现，因此有兼容性的问题</li>
</ul>
<h4 id="let"><a href="#let" class="headerlink" title="let"></a>let</h4><ul>
<li>变量不能重复声明(var可以)<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> a=<span class="number">1</span></span><br><span class="line"><span class="keyword">let</span> a=<span class="number">2</span><span class="comment">//出错</span></span><br></pre></td></tr></table></figure></li>
<li>块级作用域 只在代码块有效</li>
<li>不存在变量提升<ul>
<li>变量提升：变量可以在声明之前进行初始化和使用。</li>
<li>只会提升声明，不会提升其初始化</li>
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</li>
<li>不影响作用域链</li>