头顶气泡：说话内容与角色绑定

-- 错误：气泡挂在屏幕层，与角色分家
function onChat(pid, text)
    screenBubble:setPosition(200, 300)
    screenBubble.text = text
end

local function showBubble(charNode, text)
    local bubble = charNode:getChildByName("bubble")
    if bubble == nil then
        bubble = createBubble()
        charNode:addChild(bubble)
    end
    bubble:stopAllActions()
    bubble:setVisible(true)
    bubble:getChildByName("text"):setString(text)
    later(4, function()
        bubble:setVisible(false)
    end)
end