Rust字节数组和整型互转

fn main() {
    let bytes: [u8; 2] = [1, 2];
    assert_eq!(i16::from_le_bytes(bytes), (2 << 8) + 1);
    assert_eq!(i16::from_be_bytes(bytes), (1 << 8) + 2);
    let x: i16 = (2 << 8) + 1;
    assert_eq!([1, 2], x.to_le_bytes());
    assert_eq!([2, 1], x.to_be_bytes());
}