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let x = 12;
let last = 0;
while (x > 0) {
    let now = new Date().getTime();
    if (now - last > 1000) {
        for (let y = 9; y <= 13; y++) {
            for (let z = 0; z <= 4; z++) {
                voxels.setVoxelId(x - 1, y, z, voxels.getVoxelId(x, y, z));
                voxels.setVoxelId(x, y, z, 0);
            }
        }
        x = x - 1;
        last = now;
    }
}

最后报错：Script execution timed out