1. 基础外观

    <span class="e_switch">
    	<span class="off"></span>
    	<span class="on"></span>
    	<a href="#nogo""></a>
    </span>
    
  2. 扩展外观

    1. 打开状态

      <span class="e_switch e_switch-on">
      	<span class="off"></span>
      	<span class="on"></span>
      	<a href="#nogo""></a>
      </span>