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<meta property="og:description" content="1.介绍 JWT（Json Web Token）是为了在网络应用环境间传递声明而执行的一种基于JSON的开放标准。JWT的声明一般被用来在身份提供者和服务提供者间传递被认证的用户身份信息，以便于从资源服务器获取资源。比如用在用户登录上。JWT最重要的作用就是对 token信息的防伪作用。 JWT的原理： 一个JWT由三个部分组成：公共部分、私有部分、签名部分。最后由这三">
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<p> JWT的原理： </p>
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<p> 一个JWT由三个部分组成：公共部分、私有部分、签名部分。最后由这三者组合进行base64编码得到JWT。</p>
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<p><img src="/pictures/image-20230420102523288.png" alt="image-20230420102523288"></p>
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<p><img src="/pictures/image-20230420103234232.png" alt="image-20230420103234232"></p>
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<p>1、 公共部分</p>
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<p> 主要是该JWT的相关配置参数，比如签名的加密算法、格式类型、过期时间等等。</p>
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<p> Key=ATGUIGU</p>
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<p>2、 私有部分</p>
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<p> 用户自定义的内容，根据实际需要真正要封装的信息。</p>
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<p> userInfo{用户的Id，用户的昵称nickName}</p>
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<p>3、 签名部分</p>
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<p> SaltiP: 当前服务器的Ip地址!{linux 中配置代理服务器的ip}</p>
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<p> 主要用户对JWT生成字符串的时候，进行加密{盐值}</p>
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<p>最终组成 key+salt+userInfo -> token!</p>
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<p>base64编码，并不是加密，只是把明文信息变成了不可见的字符串。但是其实只要用一些工具就可以把base64编码解成明文，所以不要在JWT中放入涉及私密的信息。</p>
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<h2 id="2-使用"><a href="#2-使用" class="headerlink" title="2.使用"></a>2.使用</h2><h3 id="1-导入依赖"><a href="#1-导入依赖" class="headerlink" title="1.导入依赖"></a>1.导入依赖</h3><figure class="highlight xml"><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"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>io.jsonwebtoken<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>jjwt<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>0.7.0<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br></pre></td></tr></table></figure>
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<h3 id="2-引入工具类"><a href="#2-引入工具类" class="headerlink" title="2.引入工具类"></a>2.引入工具类</h3><p>以下工具类根据情况任选一种即可</p>
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<p>一种是在请求头中获取token,然后再获取用户的信息,另一种直接传入token，然后获取用户信息</p>
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<figure class="highlight java"><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><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.atguigu.yygh.common.helper;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> io.jsonwebtoken.*;</span><br><span class="line"><span class="keyword">import</span> org.springframework.util.StringUtils;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Date;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> GongChangjiang</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Date</span> 2023/4/20</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">JwtHelper</span> {</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="type">long</span> <span class="variable">tokenExpiration</span> <span class="operator">=</span> <span class="number">24</span>*<span class="number">60</span>*<span class="number">60</span>*<span class="number">1000</span>; <span class="comment">//token的过期时间</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="type">String</span> <span class="variable">tokenSignKey</span> <span class="operator">=</span> <span class="string">"123456"</span>; <span class="comment">//token 签名的密钥</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 根据参数生成token</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> userId 用户的id</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> userName 用户名</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> token字符串</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">createToken</span><span class="params">(Long userId, String userName)</span> {</span><br><span class="line"> <span class="type">String</span> <span class="variable">token</span> <span class="operator">=</span> Jwts.builder()</span><br><span class="line"> .setSubject(<span class="string">"YYGH-USER"</span>) <span class="comment">//分类，自定义</span></span><br><span class="line"> .setExpiration(<span class="keyword">new</span> <span class="title class_">Date</span>(System.currentTimeMillis() + tokenExpiration))<span class="comment">//设置过期时间</span></span><br><span class="line"> .claim(<span class="string">"userId"</span>, userId)<span class="comment">//设置主体信息</span></span><br><span class="line"> .claim(<span class="string">"userName"</span>, userName)</span><br><span class="line"> .signWith(SignatureAlgorithm.HS512, tokenSignKey)<span class="comment">//签名hash</span></span><br><span class="line"> .compressWith(CompressionCodecs.GZIP)</span><br><span class="line"> .compact();</span><br><span class="line"> <span class="keyword">return</span> token;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 根据token字符串得到用户的id</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> Long <span class="title function_">getUserId</span><span class="params">(String token)</span> {</span><br><span class="line"> <span class="keyword">if</span>(StringUtils.isEmpty(token)) <span class="keyword">return</span> <span class="literal">null</span>;</span><br><span class="line"> Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);</span><br><span class="line"> <span class="type">Claims</span> <span class="variable">claims</span> <span class="operator">=</span> claimsJws.getBody();</span><br><span class="line"> <span class="type">Integer</span> <span class="variable">userId</span> <span class="operator">=</span> (Integer)claims.get(<span class="string">"userId"</span>);</span><br><span class="line"> <span class="keyword">return</span> userId.longValue();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 根据token字符串得到用户名</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">getUserName</span><span class="params">(String token)</span> {</span><br><span class="line"> <span class="keyword">if</span>(StringUtils.isEmpty(token)) <span class="keyword">return</span> <span class="string">""</span>;</span><br><span class="line"> Jws<Claims> claimsJws</span><br><span class="line"> = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);</span><br><span class="line"> <span class="type">Claims</span> <span class="variable">claims</span> <span class="operator">=</span> claimsJws.getBody();</span><br><span class="line"> <span class="keyword">return</span> (String)claims.get(<span class="string">"userName"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<figure class="highlight java"><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><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.atguigu.commonutils;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> io.jsonwebtoken.Claims;</span><br><span class="line"><span class="keyword">import</span> io.jsonwebtoken.Jws;</span><br><span class="line"><span class="keyword">import</span> io.jsonwebtoken.Jwts;</span><br><span class="line"><span class="keyword">import</span> io.jsonwebtoken.SignatureAlgorithm;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.server.reactive.ServerHttpRequest;</span><br><span class="line"><span class="keyword">import</span> org.springframework.util.StringUtils;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> java.util.Date;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> helen</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2019/10/16</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">JwtUtils</span> {</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 设置token的过期时间</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="type">long</span> <span class="variable">EXPIRE</span> <span class="operator">=</span> <span class="number">1000</span> * <span class="number">60</span> * <span class="number">60</span> * <span class="number">24</span>;</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 密钥</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="type">String</span> <span class="variable">APP_SECRET</span> <span class="operator">=</span> <span class="string">"ukc8BDbRigUDaY6pZFfWus2jZWLPHO"</span>;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 生成token字符串</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">getJwtToken</span><span class="params">(String id, String nickname)</span>{</span><br><span class="line"></span><br><span class="line"> <span class="type">String</span> <span class="variable">JwtToken</span> <span class="operator">=</span> Jwts.builder()</span><br><span class="line"> .setHeaderParam(<span class="string">"typ"</span>, <span class="string">"JWT"</span>)</span><br><span class="line"> .setHeaderParam(<span class="string">"alg"</span>, <span class="string">"HS256"</span>)</span><br><span class="line"> .setSubject(<span class="string">"guli-user"</span>)</span><br><span class="line"> .setIssuedAt(<span class="keyword">new</span> <span class="title class_">Date</span>())</span><br><span class="line"> .setExpiration(<span class="keyword">new</span> <span class="title class_">Date</span>(System.currentTimeMillis() + EXPIRE))</span><br><span class="line"> .claim(<span class="string">"id"</span>, id)</span><br><span class="line"> .claim(<span class="string">"nickname"</span>, nickname)</span><br><span class="line"> .signWith(SignatureAlgorithm.HS256, APP_SECRET)</span><br><span class="line"> .compact();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> JwtToken;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 判断token是否存在与有效</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="type">boolean</span> <span class="title function_">checkToken</span><span class="params">(String jwtToken)</span> {</span><br><span class="line"> <span class="keyword">if</span>(StringUtils.isEmpty(jwtToken)) <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 判断token是否存在与有效</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="type">boolean</span> <span class="title function_">checkToken</span><span class="params">(HttpServletRequest request)</span> {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="type">String</span> <span class="variable">jwtToken</span> <span class="operator">=</span> request.getHeader(<span class="string">"token"</span>);</span><br><span class="line"> <span class="keyword">if</span>(StringUtils.isEmpty(jwtToken)) <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line"> Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 根据token获取会员id</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">getMemberIdByJwtToken</span><span class="params">(HttpServletRequest request)</span> {</span><br><span class="line"> <span class="type">String</span> <span class="variable">jwtToken</span> <span class="operator">=</span> request.getHeader(<span class="string">"token"</span>);</span><br><span class="line"> <span class="keyword">if</span>(StringUtils.isEmpty(jwtToken)) <span class="keyword">return</span> <span class="string">""</span>;</span><br><span class="line"> Jws<Claims> claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);</span><br><span class="line"> <span class="type">Claims</span> <span class="variable">claims</span> <span class="operator">=</span> claimsJws.getBody();</span><br><span class="line"> <span class="keyword">return</span> (String)claims.get(<span class="string">"id"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h3 id="3-在登录中使用Jwt工具"><a href="#3-在登录中使用Jwt工具" class="headerlink" title="3.在登录中使用Jwt工具"></a>3.在登录中使用Jwt工具</h3><p>1.登录成功之后返回token字符串</p>
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<p><img src="/pictures/image-20230420110340570.png" alt="image-20230420110340570"></p>
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<p>2.前端处理的思路</p>
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<p>获取token字符串 <strong>-></strong> 将token字符串和用户信息存放在cokkie中 <strong>-></strong> 页面在cokkie中获取用户信息显示在页面上</p>
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<p>前端登录与否的校验、后端网关登录与否的校验…….</p>
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<p>之后补充完整的代码示例 这里没有遇到好的登录示例 ……….</p>
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</article><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/Java/">Java</a></div><div class="post_share"><div class="social-share" data-image="/img/7.png" data-sites="wechat,weibo,qq"></div><link rel="stylesheet" href="/cdn/css/share.min.css" media="print" onload="this.media='all'"><script src="/cdn/js/social-share.min.js" defer></script></div></div><div class="post-reward"><div class="reward-button"><i class="fas fa-qrcode"></i> 打赏</div><div class="reward-main"><ul class="reward-all"><li class="reward-item"><a href="/img/wechat.jpg" target="_blank"><img class="post-qr-code-img" src="/img/wechat.jpg" alt="微信"/></a><div class="post-qr-code-desc">微信</div></li><li class="reward-item"><a href="/img/alipay.jpg" target="_blank"><img class="post-qr-code-img" src="/img/alipay.jpg" alt="支付宝"/></a><div class="post-qr-code-desc">支付宝</div></li></ul></div></div><br/><div id="post-comment"><div class="comment-head"><div class="comment-headline"><i class="far fa-comment-alt fa-fw"></i><span> 评论</span></div></div><div class="comment-wrap"><div><div id="gitalk-container"></div></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="/img/avatar.jpg" onerror="this.onerror=null;this.src='/img/loading.gif'" alt="avatar"/></div><div class="author-info__name">Jason</div><div class="author-info__description">Debug the World！</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">60</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">39</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">10</div></a></div><a id="card-info-btn"><i class="fab fa-microsoft"></i><span>Ctrl + D 收藏</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/JasonsGong" 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