类似以下内容应该可以:

Something like the following should do just fine:

var src = $('#fancybox-img').attr('src'); // Looks for the *fancyboxed* image
var idx = $('a[href="'+src+'"]').index(); // Gets the index of the thumbnail

如果您使用某些自定义DOM层次结构，则您可能必须采用此解决方案.

You may have to adapt this solution if you use some custom DOM hierarchy.