UniTreeview中能改变一级目录的字体和颜色

function beforeInit(sender, config)

{ ID="#"+config.id;
 Ext.util.CSS.createStyleSheet(`
  ${ID} .x-tree-node-text{color:green;font-weight:800;}  
  ${ID} .x-tree-elbow-line ~ span{color:black;font-weight:400;}
`);  
}