解决谷歌浏览器再上传相同文件时不可用

app/views/attachments/_form.html.erb

@@ -12,8 +12,16 @@
   <% end %>
 <% end %>
 </span>
+<script type='text/javascript'>
+    function CompatibleSend()
+    {
+        var obj=document.getElementById("_file");
+        var file= $(obj).clone();
+        file.click();
+    }
+</script>
 <span class="add_attachment">
-<%= button_tag "浏览", :type=>"button", :onclick=>"_file.click()" %>
+<%= button_tag "浏览", :type=>"button", :onclick=>"CompatibleSend();" %>
 <!--%= link_to image_tag(),"javascript:void(0)", :onclick => "_file.click()"%-->
 <%= file_field_tag 'attachments[dummy][file]',
       :id => '_file',