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world.onPlayerJoin(async({entity})=>{     entity.position.copy(one.position)     entity.num = 1     main(entity)      })

 

const one = world.querySelector("#出生点-1") const two = world.querySelector("#出生点-2") const three = world.querySelector("#出生点-3")

 

one.collides = true; one.fixed = true; two.collides = true; two.fixed = true; three.fixed = true; three.collides = true;

 

world.onEntityContact(async({entity, other})=>{     if (entity.id == "出生点-2"){         entity.num = 2         other.player.directMessage("存档成功")         console.log(entity.num)     }     if (entity.id == "出生点-3"){         entity.num = 3         other.player.directMessage("存档成功")         console.log(entity.num)     }     if (entity.id == "出生点-1"){         entity.num = 1         other.player.directMessage("存档成功")         console.log(entity.num)     } })

world.onVoxelContact(({entity, voxel})=>{     const voxelName = voxels.name(voxel)     if (voxelName === "lava02"){         if (entity.num = 1){             entity.position.copy(one.position)         }         if (entity.num = 2){             entity.position.copy(two.position)         }         if (entity.num = 3){             entity.position.copy(three.position)         }     } })   为什么在玩家碰到方块“lava02”的时候，变量entity.num会自动变成"3"，为什么？