自定义事件

$(function() {
    var $zoomify = $('.zoomify');
    $zoomify.zoomify().on({
        'zoom-in.zoomify': function() {
            alert('开始放大');
        },
        'zoom-in-complete.zoomify': function() {
            alert('放大完成');
        },
        'zoom-out.zoomify': function() {
            alert('开始缩小');
        },
        'zoom-out-complete.zoomify': function() {
            alert('缩小完成');
        },
    });
});

<div class="wrap">
    <img class="zoomify" src="images/img1.jpg" alt="">
</div>