【easyui】tree双击展开

$('#tree').tree({
url: "${pageContext.request.contextPath}/sys/sysRes/getUserMenus.do",
method:'get',
animate:true,
dnd:true,
onClick: function(node){
if($(this).tree('isLeaf',node.target)){
addPanel(node);
}else{
$(this).tree(node.state === 'closed' ? 'expand' : 'collapse', node.target);
node.state = node.state === 'closed' ? 'open' : 'closed';
}

}
});