edit2-bucket校验

@@ -114,7 +114,7 @@ components.prototype={
 
             $('input[type="file"]', that.el).each(function() {
 
-                var bucket= $(this).data("bucket")||that.option.bucket;
+                var bucket= $(this).data("bucket")||that.option.bucket||$(this).attr("bucket");
 
                 if(!bucket){
                     alert("bucket 不存在");