滚轮怎么设置成上下翻页，而不是图片缩放

wenjuan.com/s/iAfU3mb/
wenjuan.com/s/YvM7Nj/
wenjuan.com/s/VBzQfak/
wenjuan.com/s/MFnqIjH/
wenjuan.com/s/uUveii7/
wenjuan.com/s/6nyIjeb6/
wenjuan.com/s/muU7vey/
wenjuan.com/s/qIjI329/
wenjuan.com/s/2MNfIjm/
wenjuan.com/s/UvUFF3j/
wenjuan.com/s/ZjuYZz/
wenjuan.com/s/ee2QBz1/
wenjuan.com/s/qquAJ3z/
wenjuan.com/s/VnQjIbw/
wenjuan.com/s/ZFJFJv6/
wenjuan.com/s/aMBZ7rp/
wenjuan.com/s/ZjmuymP/
wenjuan.com/s/qequMbB/
wenjuan.com/s/3YZFnqO/
wenjuan.com/s/f2yyU3d/
wenjuan.com/s/yIbuimC/
wenjuan.com/s/qQ7Fvqf/
wenjuan.com/s/YVvmqq6O/
wenjuan.com/s/UvMvqqD/
wenjuan.com/s/eyiMnuF/
wenjuan.com/s/ANriUjf/
wenjuan.com/s/J3uqIri/
wenjuan.com/s/QZVFNbH/
wenjuan.com/s/VZvaaq8/
wenjuan.com/s/mIVnem7/
wenjuan.com/s/RJNfqyz/
wenjuan.com/s/ZfYruqOI/
wenjuan.com/s/Fzquqm3/
wenjuan.com/s/r6jaMvh/
wenjuan.com/s/vqEziigL/
wenjuan.com/s/vAZveeR/
wenjuan.com/s/aUNRZ3t/
wenjuan.com/s/YZFjA3K/
wenjuan.com/s/2Yn2U36/
wenjuan.com/s/JVz2MzF/
wenjuan.com/s/b6JVBbV/
wenjuan.com/s/vMf2maL/
wenjuan.com/s/FbquQbP/
wenjuan.com/s/QRJzUzo/
wenjuan.com/s/Q7jIbqm/
wenjuan.com/s/JN3EFbc/
wenjuan.com/s/Enm6Zbu/
wenjuan.com/s/iyuIF3J/
wenjuan.com/s/2EfuQnr/
wenjuan.com/s/qmqYzuNn/
wenjuan.com/s/aqEB7nw/
wenjuan.com/s/vqiYji6/
wenjuan.com/s/qEzEruj/
wenjuan.com/s/niqq6b0/
wenjuan.com/s/fAjEj2Y/
wenjuan.com/s/7bUrYn8/