loading button should be unhandlable

components/button/demo/loading.md

@@ -21,9 +21,6 @@ var App = React.createClass({
   render() {
     var loadingClass = this.state.loading ? 'ant-btn-loading' : '';
     return <div>
-      <button className="ant-btn ant-btn-primary ant-btn-circle">
-        <i className="anticon anticon-loading"></i>
-      </button>
       <button className="ant-btn ant-btn-primary ant-btn-lg ant-btn-loading">
         加载中
       </button>

style/components/button.less

@@ -44,6 +44,8 @@
 
   &-loading {
     padding-right: 31px;
+    pointer-events: none;
+    opacity: 0.75;
     &:after {
       font-family: anticon;
       .animation(loadingCircle 1s infinite linear);