指令效果如下
Minecraft基岩版1.19更新了execute的格式，本文提供的是老版execute指令格式，如果你是用的是1.19，需要自行更改指令格式
相关指令如下
#首先创建一个名字为time的计分板（执行一次即可）
scoreboard objectives add time dummy time下面这些指令，第一个命令方块放置为重复无条件的，剩下都改成连锁无条件的保持开启。
#这两个指令是保证流畅，防止游戏卡顿
execute @e[type=minecraft:leash_knot] ~ ~ ~ scoreboard players add @s time 1
execute @e[type=minecraft:leash_knot,scores={time=2..}] ~ ~ ~ kill @s
#summon了拴绳结实体，这里用到了穷举!
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1 ^-1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.3 ^1 ^-1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1 ^-1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.6 ^1 ^-1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.6 ^1 ^-1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1 ^1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.3 ^1 ^1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.6 ^1 ^1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.6 ^1 ^1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1 ^1
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.2 ^0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1.2 ^0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.3 ^1.2 ^0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.6 ^1.2 ^0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.6 ^1.2 ^0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.6 ^1.2 ^-0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.6 ^1.2 ^-0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.3 ^1.2 ^-0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1.2 ^-0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.2 ^-0.8
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.4 ^0.5
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.4 ^-0.5
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.5 ^0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.5 ^-0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^ ^1.5 ^
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1.5 ^0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.3 ^1.5 ^0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.6 ^1.5 ^0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.6 ^1.5 ^0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.6 ^1.5 ^-0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.3 ^1.5 ^-0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1.5 ^-0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^0.3 ^1.5 ^-0.3
execute @e[type=minecraft:boat] ^ ^ ^ summon minecraft:leash_knot ^-0.6 ^1.5 ^-0.3