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微信小程序Megalo开发踩坑计-普通二维码绑定
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<time title="创建时间：2019-04-21 15:22:50 / 修改时间：15:36:37" itemprop="dateCreated datePublished" datetime="2019-04-21T15:22:50+08:00">2019-04-21</time>
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<p>首先简单说一下普通二维码绑定功能作用：</p>
<ol>
<li>兼容线下已有的二维码</li>
<li>能同时支持微信、支付宝小程序</li>
<li>小程序启动传参</li>
</ol>
<p><a href="https://developers.weixin.qq.com/miniprogram/introduction/qrcode.html" target="_blank" rel="noopener">微信小程序普通二维码资料</a></p>
<p><a href="https://docs.alipay.com/mini/introduce/vzd5v0" target="_blank" rel="noopener">支付宝小程序普通二维码资料</a></p>
<hr>
<p>我的项目原始需求是扫描二维码调起小程序并获取当前被扫描设备ID。<br>背景介绍完毕回到Megalo，由于Megalo对原生生命周期进行了封装，这里碰到得问题是二维码值从何处获取？<br>直接上解决代码：<br><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">onLoad</span>(<span class="params"></span>)</span>{</span><br><span class="line"> <span class="keyword">if</span>(<span class="keyword">this</span>.$mp.query.q){<span class="comment">//判断是否获取到二维码值，用户可能通过扫二维码进来，或者是微笑下拉小程序直接进入。</span></span><br><span class="line"> <span class="keyword">let</span> deviceId = getURLParameters(<span class="built_in">decodeURIComponent</span>(<span class="keyword">this</span>.$mp.query.q)).d <span class="comment">//我的二维码值是https://xxxx/xxxx?d=ABCD123,使用正则获取url参数</span></span><br><span class="line"> <span class="keyword">if</span>(deviceId){</span><br><span class="line"> appInstance.globalData.devID = deviceId; <span class="comment">//保存至全局变量</span></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="comment">//url解析代码</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getURLParameters</span>(<span class="params">url</span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> url</span><br><span class="line"> .match(<span class="regexp">/([^?=&]+)(=([^&]*))/g</span>)</span><br><span class="line"> .reduce(</span><br><span class="line"> (a, v) => (</span><br><span class="line"> (a[v.slice(<span class="number">0</span>, v.indexOf(<span class="string">"="</span>))] = v.slice(v.indexOf(<span class="string">"="</span>) + <span class="number">1</span>)), a</span><br><span class="line"> ),</span><br><span class="line"> {}</span><br><span class="line"> )</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>答案就是<a href="https://megalojs.org/#/api/index?id=mp" target="_blank" rel="noopener">$mp</a>,页面初始化时保存小程序的相关信息都绑定在this.$mp。<br>具体$mp内容很多，下面一个截图大家可以简单看一下，实际根据项目任君取用。<br><img src="/2019/04/21/微信小程序Megalo开发踩坑计-普通二维码绑定/mp.png" title="mp"></p>
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<p>最近项目需要开发一个微信小程序应用，考虑前端技术栈统一(Vue)，选用网易开源的Megalo(网上戏称说网易出品必属精品)。</p>
<p>可能开源不久，网上资料较少，在此记录点开发中碰到的小问题。</p>
<hr>
<p>由于微信的标签与HTML有差异，vue事件的需要重新对应</p>
<p>传统HTML INPUT radio事件<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">input</span> <span class="attr">type</span>=<span class="string">"radio"</span> <span class="attr">v-model</span>=<span class="string">"pick"</span> <span class="attr">v-bind:value</span>=<span class="string">"a"</span>></span></span><br></pre></td></tr></table></figure></p>
<p>但是小程序重新定义INPUT标签，单选radio采用独立标签<br><figure class="highlight html"><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">radio-group</span> <span class="attr">class</span>=<span class="string">"radio-group"</span> <span class="attr">bindchange</span>=<span class="string">"radioChange"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">label</span> <span class="attr">class</span>=<span class="string">"radio"</span> <span class="attr">wx:for</span>=<span class="string">""</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">radio</span> <span class="attr">value</span>=<span class="string">""</span> <span class="attr">checked</span>=<span class="string">""</span> /></span></span><br><span class="line"> <span class="tag"></<span class="name">label</span>></span></span><br><span class="line"><span class="tag"></<span class="name">radio-group</span>></span></span><br></pre></td></tr></table></figure></p>
<p>这样导致v-model无法绑定，泪目。。。<br>那么这个问题如何解决呢，重点就在bindchange=”radioChange”（radio选择变更事件）。<br>现在问题变成bindchange对应vue中什么事件呢？答案:@change<br><figure class="highlight html"><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></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">radio-group</span> @<span class="attr">change</span>=<span class="string">"breathChange"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">label</span> ></span><span class="tag"><<span class="name">radio</span> <span class="attr">value</span>=<span class="string">"positive"</span>/></span>阳性<span class="tag"></<span class="name">label</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">label</span> ></span><span class="tag"><<span class="name">radio</span> <span class="attr">value</span>=<span class="string">"negative "</span>/></span>阴性<span class="tag"></<span class="name">label</span>></span></span><br><span class="line"><span class="tag"></<span class="name">radio-group</span>></span></span><br></pre></td></tr></table></figure></p>
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<h2 id="安装环境"><a href="#安装环境" class="headerlink" title="安装环境"></a>安装环境</h2><p>Azure RedHat7</p>
<h2 id="安装数据库"><a href="#安装数据库" class="headerlink" title="安装数据库"></a>安装数据库</h2><ol>
<li>安装mysql yum源<br><code>yum localinstall https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm</code></li>
<li>选择特定版本安装<br><code>yum --disablerepo=mysql80-community --enablerepo=mysql55-community install mysql-community-server</code><br>具体版本可按需求修改为mysql<em>XX</em>-community</li>
<li>验证安装<br>启动：<br><code>systemctl start mysqld</code><br>登陆验证：<br><code>mysql -u root --skip-password</code></li>
<li>进行安全设置向导：<figure class="highlight sh"><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">[root@server1 ~]<span class="comment"># /usr/bin/mysql_secure_installation</span></span><br><span class="line"> </span><br><span class="line">NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL</span><br><span class="line"> </span><br><span class="line">SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!</span><br><span class="line"> </span><br><span class="line">In order to <span class="built_in">log</span> into MySQL to secure it, we<span class="string">'ll need the current</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">password for the root user. If you'</span>ve just installed MySQL, and</span><br><span class="line"> </span><br><span class="line">you haven<span class="string">'t set the root password yet, the password will be blank,</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">so you should just press enter here.</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Enter current password for root (enter for none):<–初次运行直接回车</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">OK, successfully used password, moving on…</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Setting the root password ensures that nobody can log into the MySQL</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">root user without the proper authorisation.</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Set root password? [Y/n] <– 是否设置root用户密码，输入y并回车或直接回车</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">New password: <– 设置root用户的密码</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Re-enter new password: <– 再输入一次你设置的密码</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Password updated successfully!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Reloading privilege tables..</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">… Success!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">By default, a MySQL installation has an anonymous user, allowing anyone</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">to log into MySQL without having to have a user account created for</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">them. This is intended only for testing, and to make the installation</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">go a bit smoother. You should remove them before moving into a</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">production environment.</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Remove anonymous users? [Y/n] <– 是否删除匿名用户,生产环境建议删除，所以直接回车</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">… Success!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Normally, root should only be allowed to connect from '</span>localhost<span class="string">'. This</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">ensures that someone cannot guess at the root password from the network.</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Disallow root login remotely? [Y/n] <–是否禁止root远程登录,根据自己的需求选择Y/n并回车,建议禁止</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">… Success!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">By default, MySQL comes with a database named '</span><span class="built_in">test</span><span class="string">' that anyone can</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">access. This is also intended only for testing, and should be removed</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">before moving into a production environment.</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Remove test database and access to it? [Y/n] <– 是否删除test数据库,直接回车</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">- Dropping test database…</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">… Success!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">- Removing privileges on test database…</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">… Success!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Reloading the privilege tables will ensure that all changes made so far</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">will take effect immediately.</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Reload privilege tables now? [Y/n] <– 是否重新加载权限表，直接回车</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">… Success!</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">Cleaning up…</span></span><br><span class="line"><span class="string"> </span></span><br><span class="line"><span class="string">All done! If you'</span>ve completed all of the above steps, your MySQL</span><br><span class="line"> </span><br><span class="line">installation should now be secure.</span><br><span class="line"> </span><br><span class="line">Thanks <span class="keyword">for</span> using MySQL!</span><br></pre></td></tr></table></figure>
</li>
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<h2 id="修改数据目录"><a href="#修改数据目录" class="headerlink" title="修改数据目录"></a>修改数据目录</h2><ol>
<li><p>查看当前数据目录<br><code>mysql -u root -p #登陆数据库</code><br><code>select @@datadir; #查询目录位置</code> </p>
<figure class="highlight plain"><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">mysql> select @@datadir;</span><br><span class="line">+------------------+</span><br><span class="line">| @@datadir |</span><br><span class="line">+------------------+</span><br><span class="line">| /var/lib/mysql/ |</span><br><span class="line">+------------------+</span><br><span class="line">1 row in set (0.00 sec)</span><br></pre></td></tr></table></figure>
</li>
<li><p>停用mysql服务<br><code>systemctl stop mysqld</code></p>
</li>
<li>数据目录迁移<br><code>rsync -av /var/lib/mysql /mnt/data/</code><br><code>mv /var/lib/mysql /var/lib/mysql.bak</code></li>
<li>修改新目录selinux属性，这步解决生产环境中selinux启用下，mysql无法启动错误<br> [Warning] Can’t create test file /mnt/data/mysql/bds.lower-test<br> <code>chcon -Rv -u system_u -t mysqld_db_t /mnt/data/mysql</code></li>
<li><p>修改mysql配置文件，重新指定mysqld数据读取路径和mysql命令socket路径<br>修改/etc/my.cnf</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">......</span><br><span class="line">#修改</span><br><span class="line">[mysqld]</span><br><span class="line">datadir=/mnt/data/mysql</span><br><span class="line">socket=/mnt/data/mysql/mysql.sock</span><br><span class="line">......</span><br><span class="line">#新增</span><br><span class="line">[client]</span><br><span class="line">port=3306</span><br><span class="line">socket=/mnt/data/mysql/mysql.sock</span><br><span class="line">......</span><br></pre></td></tr></table></figure>
</li>
<li><p>到此安装修改完毕，重启启动服务登陆并验证安装目录</p>
<figure class="highlight plain"><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">mysql> select @@datadir;</span><br><span class="line">+------------------+</span><br><span class="line">| @@datadir |</span><br><span class="line">+------------------+</span><br><span class="line">| /mnt/data/mysql/ |</span><br><span class="line">+------------------+</span><br><span class="line">1 row in set (0.00 sec)</span><br></pre></td></tr></table></figure></li>
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<blockquote><p>吾十有五，而志于学。三十而立。四十而不惑。五十而知天命。六十而耳顺。七十而从心所欲，不逾矩。</p>
<footer><strong>论语·为政</strong><cite>孔子</cite></footer></blockquote>
<p>晃晃三十年，转眼三十而立。</p>
<p>古人诚不我欺，到了这个年纪如同开智了般突然间有了许多感慨。</p>
<p>于是乎想着开此博客，记录下平日偶的的感触。</p>
<p>其次，转眼从事码农7年，日常从网络中获取了不少前辈的指导，念及于此自己也应为后来人贡献点些许的帮助。</p>
<p>暂时写这么多，立个flag一周一篇！</p>
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