# 语法
EVAL script numkeys key [key ...] arg [arg ...]
# 示例
eval "return {KEYS[1],KEYS[2],ARGV[1],ARGV[2]}" 2 name age king 18
# 没有参数 set foo bar
eval "return redis.call('set','foo','bar')" 0
# 1个参数 set foo bar
eval "return redis.call('set',KEYS[1],'bar')" 1 foo
# get king
eval "return redis.call('get',KEYS[1])" 1 king
eval "return 10" 0