preventDefault for onClose.

components/tag/index.jsx

@@ -15,6 +15,8 @@ export default class Tag extends React.Component {
   }
 
   close(e) {
+    this.props.onClose(e);
+    if(e.defaultPrevented) return;
     const dom = ReactDOM.findDOMNode(this);
     dom.style.width = `${dom.offsetWidth}px`;
     // It's Magic Code, don't know why
@@ -22,7 +24,6 @@ export default class Tag extends React.Component {
     this.setState({
       closing: true,
     });
-    this.props.onClose(e);
   }
 
   animationEnd(key, existed) {