feat(Counter): 新增 lininput 事件

close #1004

src/counter/index.js

@@ -146,5 +146,9 @@ Component({
         composed: true
       });
     },
+
+    onInput(e){
+      eventUtil.emit(this,'lininput',e.detail);
+    }
   }
 });

src/counter/index.wxml

@@ -11,6 +11,7 @@
           type="number"
           focus="{{focus}}"
           value="{{result}}"
+          bind:input="onInput"
           bindblur="onBlur"/>
   <view wx:else class="l-count-class count" mut-bind:tap="onCount">{{result}}</view>
   <view class="l-symbol-class symbol {{result>=max|| disabled?'disabled l-disabled-class':'abled l-symbol-class'}}"