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先打开场景-全局特效-飘雪，然后在代码区输入

let seasonDuration = 1000 * 15  // 单位是毫秒：1秒 = 1000 毫秒
for(let x = 0; x<256; x++){
            for(let y = 0; y<256; y++){
                for(let z = 0; z<256;z++)
                    if(voxels.getVoxel(x, y, z) === voxels.id('grass')){
                        voxels.setVoxel(x, y, z, 'white_grass')
                    }
            }
        }
async function seasonChange(){
    while(true){
        world.say('春季来临')
        for(let x = 0; x<256; x++){
            for(let y = 0; y<256; y++){
                for(let z = 0; z<256;z++)
                    if(voxels.getVoxel(x, y, z) === voxels.id('white_grass')){
                        voxels.setVoxel(x, y, z, 'grass')
                    }
            }
        }
        world.snowTexture = 'snow/leaf.part'
        world.snowColor = new Box3RGBAColor(0.91, 0.3, 0.53, 1);
        await sleep(seasonDuration)
        world.say('夏季来临')
        for(let x = 0; x<256; x++){
            for(let y = 0; y<256; y++){
                for(let z = 0; z<256;z++)
                    if(voxels.getVoxel(x, y, z) === voxels.id('grass')){
                        voxels.setVoxel(x, y, z, 'rock')
                    }
            }
        }
        world.snowColor = new Box3RGBAColor(0, 0, 0, 0);
        await sleep(seasonDuration)
        world.say('秋季来临')
        for(let x = 0; x<256; x++){
            for(let y = 0; y<256; y++){
                for(let z = 0; z<256;z++)
                    if(voxels.getVoxel(x, y, z) === voxels.id('rock')){
                        voxels.setVoxel(x, y, z, 'yellow_grass')
                    }
            }
        }
        world.snowTexture = 'snow/maple.part'
        world.snowColor = new Box3RGBAColor(3,3,0, 1);
        await sleep(seasonDuration)
        world.say('冬季来临')
        for(let x = 0; x<256; x++){
            for(let y = 0; y<256; y++){
                for(let z = 0; z<256;z++)
                    if(voxels.getVoxel(x, y, z) === voxels.id('yellow_grass')){
                        voxels.setVoxel(x, y, z, 'white_grass')
                    }
            }
        }
        world.snowTexture = 'snow/snow2.part'
        world.snowColor = new Box3RGBAColor(1,1,1, 1);
        await sleep(seasonDuration)
    }
}

seasonChange() //调用函数