1. 基础外观

    <span class="e_select"><span><span>
    	<select>
    		<option>请选择</option>
    	</select>
    </span></span></span>
    
  2. 扩展外观

    1. 不同相对位置时呈现的状态

      1. 靠左

        <span class="e_select e_select-left"><span><span>
        	<select>
        		<option>请选择</option>
        	</select>
        </span></span></span>
        
      2. 居中

        <span class="e_select e_select-center"><span><span>
        	<select>
        		<option>请选择</option>
        	</select>
        </span></span></span>
        
      3. 靠右

        <span class="e_select e_select-right"><span><span>
        	<select>
        		<option>请选择</option>
        	</select>
        </span></span></span>