详解：19 ::selection

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"text" name="username" id="" placeholder="合法用户名" />"text" name="username1" id="" placeholder="输入用户名">""</span> id=<span class="token string">""</span> cols=<span class="token string">"30"</span> rows=<span class="token string">"10"</span> placeholder=<span class="token string">"个人简介"</span>></pre>
<p>核心： ::selection：意思是按住鼠标左键，往右滑动就能显示出效果了</p></div></div><div id="treeSkill"></div>