��类型</a>
<ul>
<li class="chapter" data-level="5.4.1" data-path="lesson-5.html"><a href="lesson-5.html#单个元素"><i class="fa fa-check"></i><b>5.4.1</b> 单个元素</a></li>
<li class="chapter" data-level="5.4.2" data-path="lesson-5.html"><a href="lesson-5.html#数值型numeric"><i class="fa fa-check"></i><b>5.4.2</b> 数值型(numeric)</a></li>
<li class="chapter" data-level="5.4.3" data-path="lesson-5.html"><a href="lesson-5.html#字符串character"><i class="fa fa-check"></i><b>5.4.3</b> 字符�