zoom(int $scale = 100): self

$config = ['path' => './tests'];
$excel = new \Vtiful\Kernel\Excel($config);
​
$fileObject = $excel->fileName("tutorial01.xlsx");
​
$fileObject->header(['name', 'age'])
    ->zoom(200) // 设置工作表缩放系数
    ->data([
    ['viest', 21],
    ['viest', 22],
    ['viest', 23],
    ])
    ->output();