购买添加登录判断-- reviewed by jingyou

@@ -10,6 +10,7 @@ import share from '../../static/images/share.png';
 import collect from '../../static/images/collect.png';
 import collectOff from '../../static/images/collect-off.png';
 import './index.scss';
+import event from '../../utils/event'
 
 @connect(({ productDetail }) => ({
     productDetail
@@ -122,7 +123,11 @@ export default class ProductDetail extends Component {
     onClickBuy() {
         let {showSizeBox} = this.props;
 
-        showSizeBox(true);
+        event.emit('user-is-login',function () {
+          showSizeBox(true);
+        },function () {
+          showSizeBox(true);
+        })
     }
 
     render() {