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代码very简单，有注释~~~~~

Bag_thing = ['书','铁','水','青梅']
Bag_number = [4,555,6,7]
Bag = []
//设置初始数值


world.onPress(async ({ entity, button }) => {
    Bag = []
    for(i = 0;i<Bag_number.length;i++){
		Bag.push(Bag_thing[i]+'*'+Bag_number[i])
    }//把Bag_thing和Bag_number放在数组Bag里

	if (button == Box3ButtonType.ACTION1) {//当按下B

		const bag = await entity.player.dialog({//设置对话框

			type: Box3DialogType.SELECT,//类型为选择

			options: ['换视角','背包']//选项

		})
		if (bag) {
			if (bag.value == '换视角') {

				const select = await entity.player.dialog({

					type: Box3DialogType.SELECT,

					content: `你想要切换哪一种视角`,

					options: ['第一人称', '第三人称']

				})

				if (select) {//选择换视角

					if (select.value == '第一人称') {

						entity.player.cameraMode = "FPS"//设置第一人称

					}
                    else {

						entity.player.cameraMode = "FOLLOW"//设置第三人称

					}
				}

			}
            if (bag.value == '背包') {//选择背包
                
                const ba = await entity.player.dialog({

					type: Box3DialogType.SELECT,

					options: Bag//设置选项为Bag列表

    

				})
                if (ba) {
                    b = Bag_thing[ba.index] //设置B为选的东西

					if (b=='书'){

						//选择什么自己写

                    }
                    else if(b == '铁'){

						

					}
                    else if(b == '青梅'){

					}
                    else if(b == '水'){

						

					}//需要写更多依次类推
                    else{
                        entity.player.directMessage('此物品未设置')
                        
                    }//没有设置就对玩家说此物品没有设置
                    
				}
            }

		} 

	}

});