Build dist

Author: tangbc

dist/index.js

@@ -676,9 +676,9 @@
         var scrollShape = root[this.isHorizontal ? 'scrollWidth' : 'scrollHeight'];
 
         if (isUpper && !!this.dataSources.length && offset - this.upperThreshold <= 0) {
-          this.$emit('toupper', evt, range);
+          this.$emit('totop', evt, range);
         } else if (isLower && offset + offsetShape + this.lowerThreshold >= scrollShape) {
-          this.$emit('tolower', evt, range);
+          this.$emit('tobottom', evt, range);
         } else {
           this.$emit('scroll', evt, range);
         }