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测试了一遍，没有BUG，没有打注释的中文可以自定义

world.onPlayerJoin(({ entity }) => {
   entity.player.bag = ['XXX', 'YYY'];
   entity.player.bagLength = 114514;
});
async function textDialogQwQ(entity, concent, title) {
    return await entity.player.dialog({
        type: Box3DialogType.TEXT,
        title,
        content,
    })
}
global.ITEM = {
    'XXX': {
        装备的属性名: 装备的初始属性值,
        async zhuangbei(entity){
            //自己写 写什么都可以
        },
    }, 
   'YYY': {
        装备的属性名: 装备的初始属性值,
        装备的属性名: 装备的初始属性值,
        async zhuangbei(entity){
            //自己写 写什么都可以
        },
    },  
}
/*
 * name: openBag
 * author: XiaoLi
 * 调用方法: openBag(玩家对象 一般是entity); 
*/
async function openBag(entity) {
    const bagDialog = await entity.player.dialog({
       type: Box3DialogType.SELECT,
       title: `${entity.player.name}的背包`,
       content: `背包使用情况(${entity.player.bag.length}/${entity.player.bagLength})`,
       options: entity.player.bag,
    })
    if (bagDialog && bagDialog.value != '' && ITEM[bagDialog.value]) {
        const ite喵ialog = await entity.player.dialog({
            type: Box3DialogType.SELECT,
            title: `${bagDialog.value}`,
            content: `请选择对${bagDialog.value}装备的操作`,
            options: ['装备', '删除'],
        })
        if (ite喵ialog) {
            if (ite喵ialog.index == 0) {
                await ITEM[bagDialog.value].zhuangbei(entity);
                // 执行ITEM对象中bagDialog这个常量的属性value的函数zhuangbei
            } else if (ite喵ialog.index == 1) {
                entity.player.bag.splice(bagDialog.index, 1);
                textDialogQwQ(entity, `删除装备${bagDialog.value}成功`, '提示');
            }
        }
    }
}