【高级技巧】协程双向通信：resume传参与yield回传封装

local co = coroutine.create(function()
    local name = coroutine.yield("请输入名字：")
    local lv = coroutine.yield(name .. "，请输入等级：")
    print(name .. " 等级 " .. lv .. "，登记完毕。")
end)
local _, q1 = coroutine.resume(co)
print(q1)
local _, q2 = coroutine.resume(co, "玛法勇士")
print(q2)
coroutine.resume(co, 45)

local pager = coroutine.create(function()
    local page = 1
    while true do
        local size = coroutine.yield("第" .. page .. "页数据")
        page = page + 1
        if not size then
            break
        end
    end
end)