pragma solidity ^0.4.0;
contract DynamicByte{
    bytes public name = new bytes(2);
    function initName() public {
        name[0] = 0x7a;
        name[1] = 0x68;
    }
    function getLength() public view returns(uint) {
        return name.length;
    }
    function changeName() public {
        name[0] = 0x88;
    }
    function changeLength() public {
        name.length = 10;  // name的右边添加0到指定的长度
    }
    function pushTest() public {
        name.push(0x88);
    }
}