玩家进服提示，让你的服务器变得更加高大上，花里胡哨

[置顶]/scoreboard players add @a playeradd 0

/execute @a【scores={playeradd=0}】 ~~~ say 自定义内容

/scoreboard players reset * playeradd

/scoreboard players add @a playeradd 1

前置指令【需在聊天框输入】

/scoreboard objectives add playeradd dummy playeradd

创建所需要的积分版

/gamerule commandblockoutput false

关闭指令提示防刷屏