use button[type="button"] to prevent default submit behavior

components/upload/demo/basic.md

@@ -26,7 +26,7 @@ var props = {
 
 React.render(
   <Upload {...props}>
-    <button className="ant-btn ant-btn-ghost">
+    <button type="button" className="ant-btn ant-btn-ghost">
       <i className="anticon anticon-upload"></i> 点击上传
     </button>
   </Upload>

components/upload/demo/defaultFileList.md

@@ -32,7 +32,7 @@ var props = {
 
 React.render(
   <Upload {...props}>
-    <button className="ant-btn ant-btn-ghost">
+    <button type="button" className="ant-btn ant-btn-ghost">
       <i className="anticon anticon-upload"></i> 点击上传
     </button>
   </Upload>

components/upload/demo/fileList.md

@@ -61,7 +61,7 @@ var MyUpload = React.createClass({
       onChange: this.handleChange
     };
     return <Upload {...props} fileList={this.state.fileList}>
-      <button className="ant-btn ant-btn-ghost">
+      <button type="button" className="ant-btn ant-btn-ghost">
         <i className="anticon anticon-upload"></i> 点击上传
       </button>
     </Upload>;