常规示例代码演示：
<![CDATA[<div class="yo-number">
<span class="minus disabled">-</span>
<input class="input" type="text" value="0" />
<span class="plus">+</span>
</div>]]>
扩展示例代码演示：
<![CDATA[@include yo-number(
$name: test,
$width: 1rem,
$height: .25rem,
$outer-border-width: 0,
$inner-radius: 50%,
$border-color: #1ba9ba,
$sign-bgcolor: #1ba9ba,
$sign-color: #eee,
$font-size: .14rem
);]]>
使用方法：
<![CDATA[<div class="yo-number yo-number-test">
<span class="minus">-</span>
<input class="input" type="text" value="9999" />
<span class="plus">+</span>
</div>]]>