Merge pull request #2377 from btfrankenstein/2.0

feat($input-number): add events 'on-focus', 'on-blur', 'on-enter' for…

src/components/input-number/input-number.vue

@@ -239,9 +239,11 @@
             },
             focus () {
                 this.focused = true;
+                this.$emit('on-focus');
             },
             blur () {
                 this.focused = false;
+                this.$emit('on-blur');
             },
             keyDown (e) {
                 if (e.keyCode === 38) {