1. 基础外观

    <span class="e_textarea">
    	<span class="e_textareaTop"><span></span></span>
    	<span class="e_textareaContent"><textarea></textarea></span>
    	<span class="e_textareaBottom"><span></span></span>
    </span>
    
  2. 扩展外观

    1. 加入功能区域

      <span class="e_textarea">
      	<span class="e_textareaTop"><span></span></span>
      	<span class="e_textareaContent"><textarea></textarea></span>
      	<span class="e_textareaFn">
      		...
      	</span>
      	<span class="e_textareaBottom"><span></span></span>
      </span>
      
    2. 自定义高度与宽度

      <span class="e_textarea" style="width:500px;">
      	<span class="e_textareaTop"><span></span></span>
      	<span class="e_textareaContent"><textarea style="height:140px;"></textarea></span>
      	<span class="e_textareaBottom"><span></span></span>
      </span>