Lua单向链表：头节点穿链的追加写法

-- 错误：频繁中途插删用数组，整段搬移
table.insert(items, pos, value)

local list = {_head = {next = nil}, _size = 0}
local function pushBack(value)
    local node = {value = value, next = nil}
    local cur = list._head
    while cur.next ~= nil do
        cur = cur.next
    end
    cur.next = node
    list._size = list._size + 1
end
pushBack("a")
pushBack("b")
local label = panel:getChildByName("listText")
label:setString(tostring(list._size == 2))