QWebView can't open a link twice in a short time

[lvshuchengyin]

I use QWebView to load a web page.
That page have an attachment link like:

<a href="#" target="_blank">open</a>
the a link has onclick code is :
donwload_attchs('func.aspx?groupid=mail&act=getattch&TOPIC_GUID=3c9fdaef3e4a40ffb38ca0e09ba77ade&POST_Local=0&name=tmp.png&isopen=1', this.target);return false;

It just open a new tab to load a png image file. And it work fine in chrome browser.
When I click it first time, it work fine! And then I click it , it just no response, after 5 times click, it will work fine again.

I can't understand why it work like that.
Does anyone can help me to fix it?
Thanks in advance!

[lvshuchengyin]

I try a lot of times.
Found that after I click the link it will be fail to response another click until I double click the page it will be fine again.

I use qt 4.8.5

[lvshuchengyin]

I try to switch to Qt5.2, it work great. So maybe the Qt4.8.5 's javascript engine not so good.