local tab= { 
[1] = "a", 
[3] = "b", 
[4] = "c" 
} 
for i,v in pairs(tab) do        -- 输出 "a" ,"b", "c"  ,
    print( tab[i] ) 
end 

for i,v in ipairs(tab) do    -- 输出 "a" ,k=2时断开 
    print( tab[i] ) 
end

 

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