Just found a jquery problem. Seemed to be something not supported by some browsers, IE browser, and Safari, firefox does not support later to write down.

Do not support it.

jquery  

There formdat = new formdat to ($ ( "# formdat A") [0]);

This line, only Google browser kernel support so remember. We can see here. 


https://developer.mozilla.org/zh-CN/docs/Web/API/FormData/get 
If you do not understand, look at this okay. I started to think that their own problems. Looking for a long time.