Implementation of Easy UI dynamic tree click text to expand and close functions

<span style="white-space:pre"> </span>$("#tt").tree({ 
    onClick: function(node){ 
      if(node.url != null){ 
         parent.frames["content"].location.href="${ctx}" rel="external nofollow" + node.url; 
      }else{ 
         if(node.state==&#39;closed&#39;&&(!$("#tree").tree(&#39;isLeaf&#39;,node.target))){ //状态为关闭而且非叶子节点 
           $(this).tree(&#39;expand&#39;,node.target);//点击文字展开菜单  
         }else{ 
           $(this).tree(&#39;collapse&#39;,node.target); 
         } 
      } 
       
    } 
  })