jq 取得A标签中的文字，要排除某些不需要的文字

< a href="javascript:;" class="columna"><i class="fa fa-address-book" aria-hidden="true"></i> <span class="sr-only">Example of

</span>address-book</ a>

要取得：address-book

js:

//关闭iframe
    $('.columna').click(function(){
    
 var t_val=$(this).contents().filter(function() {    
        return this.nodeType == 3;
      }).text()

      if(t_val === ''){
        parent.layer.msg('请填写图标');
        return;
      }
      //parent.layer.msg('您将图标 [ ' +t_val + ' ] 成功传送给了父窗口');
      parent.$('#icon').val(t_val);
      parent.$('#parentIframe').attr("class","layui-icon parentIframe "+t_val);
      parent.layer.close(index);
    });