lua next 用法 table 空的判断

next 判断所有类型的表是否为nil

#  判断key为数字类型的

eg1、

local ta = {


}

print(#ta)
print(next(ta))

0
nil
[Finished in 0.0s]

eg2、

local ta = {
[1] = "ma"
}


print(#ta)
print(next(ta))

1
1 ma
[Finished in 0.0s]

eg1、

local ta = {
rr = "ma"
}


print(#ta)
print(next(ta))

0
rr ma
[Finished in 0.0s]