两种方式截取字符串

使用string.gmatch

local plan_id = "1,2,3,4,55,66"local match = string.gmatch( plan_id,"%d+" )local plan_ids = {}for v in match do  table.insert(plan_ids,v)endprint(#plan_ids)print(plan_ids[2])

6  2

使用string.sub

function split(str, split_char)    local sub_str_tab = {};    while (true) do        local pos = string.find(str, split_char);        if (not pos) then            sub_str_tab[#sub_str_tab + 1] = str;            break;        end        local sub_str = string.sub(str, 1, pos - 1);        sub_str_tab[#sub_str_tab + 1] = sub_str;        str = string.sub(str, pos + 1, #str);    end    return sub_str_tab;endlocal plan_id = 11local plan_ids = split(plan_id,",")if #(plan_ids) == 1 then  print("t")else  print("f")end-- print(plan_ids[1])local plan_id = "11,33,44,55,66,77"local plan_ids = split(plan_id,",")print(plan_ids[5])

t  66