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<?php echo $key==0?"zoomThumbActive":"";?>

不会用jqzoom

<li><a class="<?php echo $key==0?"zoomThumbActive":"";?> active" href='javascript:void(0);' rel="{gallery: 'gal1', smallimage: 'image_350/<?php echo $proImg['albumPath'];?>',largeimage: 'image_800/<?php echo $proImg['albumPath'];?>'}"><img src="image_50/<?php echo $proImg['albumPath'];?>" alt=""></a></li>

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